Marika Posted July 21, 2008 Report Share Posted July 21, 2008 Knew how to give it back, these days I try not to escalate problems.. Old age I guess, LOL It's also healthier for you. Good to mellow out. If you really want to make people safe drivers again then simply remove all the safety features from cars. No more seat belts, ABS brakes, traction control, air bags or stability control. No more anything. You'll see how quickly people will slow down and once again learn to drive like "normal" humans. Link to comment Share on other sites More sharing options...
sucker4caddys Posted July 21, 2008 Author Report Share Posted July 21, 2008 I'll take a bow now... Very Humble of you! That is the first think we should always ask. However last week I asked if the member check the codes and got a hard time for it... Giving you a hard time? No way!! You know how to give it back!! please help me understand in non mechanic terms what do i do is that the problem please excuse me if i sound simple but have limited time under the hood of a northstar. thanks again thank god for the internet would of ran this car off a bridge already Link to comment Share on other sites More sharing options...
Marika Posted July 21, 2008 Report Share Posted July 21, 2008 I'll take a bow now... Very Humble of you! That is the first think we should always ask. However last week I asked if the member check the codes and got a hard time for it... Giving you a hard time? No way!! You know how to give it back!! please help me understand in non mechanic terms what do i do is that the problem please excuse me if i sound simple but have limited time under the hood of a northstar. thanks again thank god for the internet would of ran this car off a bridge already Park the car and let the car run and wait for it to reach operating temperature. Check under the hood to see if the fan is running. If you turn on the AC, I believe the fan should come on automatically. Once the temperature keeps rising, the second fan should come on. Someone correct me if I got it wrong or left something out. If you really want to make people safe drivers again then simply remove all the safety features from cars. No more seat belts, ABS brakes, traction control, air bags or stability control. No more anything. You'll see how quickly people will slow down and once again learn to drive like "normal" humans. Link to comment Share on other sites More sharing options...
sucker4caddys Posted July 22, 2008 Author Report Share Posted July 22, 2008 what does the coolant sensor do and could that affect this situation?? Link to comment Share on other sites More sharing options...
sucker4caddys Posted July 22, 2008 Author Report Share Posted July 22, 2008 what does the coolant sensor do and could that affect this situation?? also the purge line is the hose connected to the resevior on top ?? Link to comment Share on other sites More sharing options...
navion Posted July 22, 2008 Report Share Posted July 22, 2008 Yes, the purge line is the small hose that attaches to the reservoir near the top. Just curious. On some engines it is possible to install the thermostat facing the wrong way. If you installed the thermostat with the spring end facing toward the hose, then it would over heat all the time. I know that the chances that it was installed incorrectly are slim, but it could be the source of your problem. BTW, If the new thermostat was exposed to steam and not immersed in coolant, even for a short time, then it may have been ruined. A simple way to check it would be to put it in a pan of water along with a thermometer and slowly heat it up. Check to see if the stat opens at or near the rated temperature. The rating is usually stamped on the stat somewhere. Also, you could have gotten a defective stat which could be the cause of all of this discussion. Britt Link to comment Share on other sites More sharing options...
sucker4caddys Posted July 22, 2008 Author Report Share Posted July 22, 2008 Yes, the purge line is the small hose that attaches to the reservoir near the top. Just curious. On some engines it is possible to install the thermostat facing the wrong way. If you installed the thermostat with the spring end facing toward the hose, then it would over heat all the time. I know that the chances that it was installed incorrectly are slim, but it could be the source of your problem. BTW, If the new thermostat was exposed to steam and not immersed in coolant, even for a short time, then it may have been ruined. A simple way to check it would be to put it in a pan of water along with a thermometer and slowly heat it up. Check to see if the stat opens at or near the rated temperature. The rating is usually stamped on the stat somewhere. Also, you could have gotten a defective stat which could be the cause of all of this discussion. i didnt put any coolant on the thermostat just stuck it in could that be a no no Link to comment Share on other sites More sharing options...
BodybyFisher Posted July 22, 2008 Report Share Posted July 22, 2008 what does the coolant sensor do and could that affect this situation?? Why do you ask this question?, the coolant sensor sends the coolant temp to the PCM inducing the PCM to take certain actions, like turn on the fan, go into closed loop, etc Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
sucker4caddys Posted July 22, 2008 Author Report Share Posted July 22, 2008 what does the coolant sensor do and could that affect this situation?? Why do you ask this question?, the coolant sensor sends the coolant temp to the PCM inducing the PCM to take certain actions, like turn on the fan, go into closed loop, etc just read somewhere that can cause overheating should i change the thermostat again Link to comment Share on other sites More sharing options...
BodybyFisher Posted July 22, 2008 Report Share Posted July 22, 2008 what does the coolant sensor do and could that affect this situation?? also the purge line is the hose connected to the resevior on top ?? The purge line is attached to the surge tank. There is a bleed port at the high point of the engine, air rises to that point, the bleed point has a metering orfice (the bolt with a hole in it) so that coolant does not come out under pressure, if at any point in the bleed line (the bolt with a hole, the hose, or the nipple at the tank) is clogged, the air can not get out and you get cavitation at the water pump that negatively impacts the circulation of coolant. Normally if you pull the hose if coolant flows the bleed line is clear. However it is also necessary to check where that hose connects to the surge tank to see if there is clogged at the tank inlet. I was just reading the diagnosics, there are three relays below the fans, you either have a bad relay or fan motor. Do both fans run? strong? Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
sucker4caddys Posted July 22, 2008 Author Report Share Posted July 22, 2008 what does the coolant sensor do and could that affect this situation?? also the purge line is the hose connected to the resevior on top ?? The purge line is attached to the surge tank. There is a bleed port at the high point of the engine, air rises to that point, the bleed point has a metering orfice (the bolt with a hole in it) so that coolant does not come out under pressure, if at any point in the bleed line (the bolt with a hole, the hose, or the nipple at the tank) is clogged, the air can not get out and you get cavitation at the water pump that negatively impacts the circulation of coolant. Normally if you pull the hose if coolant flows the bleed line is clear. However it is also necessary to check where that hose connects to the surge tank to see if there is clogged at the tank inlet. I was just reading the diagnosics, there are three relays below the fans, you either have a bad relay or fan motor. Do both fans run? strong? they both run dont know if there strong how can i check Link to comment Share on other sites More sharing options...
BodybyFisher Posted July 22, 2008 Report Share Posted July 22, 2008 If this thermostat has experienced a warning from the DIC, like "AC being turned off" or "IDLE ENGINE" or a serious overheat, replace it. Buy an AC DELCO, this way you don't have to worry about anything, I think you need to buy the seal separately. It is easy enough to replace, but I don't think this is your problem unless as britt said you got a defective one or put it in backwards. The PCM is sensing something wrong with your cooling fans. Do you ever see a red light flash on your dash?, the P1660 description states that it turns on the MIL indicator, just curious. Sometimes the fans can appear to be turning but they have a problem with their bearings, brushes (if they have brushes) or are intermittant due to a bad connection. I had a fan in a 91 that was turning but with no guts. Grab each fan and see if you feel any wobble. Mine wobbled when you rocked it. Let me look over the schematics. I would love to own a Tech 2, all of the diagnostics are oriented toward manipulating circuits manually and observing the expected results. It is necessary to determine what causes this: The PCM contains a chip called a Quad Driver Module that provides 4 switchable ground outputs for operating solenoids, relays, telltales, and other devices. Each of these ground outputs has an internal fault line that feeds back to the PCM's microprocessor. When the output is OFF, the quad driver should sense the 12 volts fed to the solenoid, relay, etc. When the output is ON, the ouad driver should sense 0 volt since it is grounding the output. If the PCM senses 0 volt when the output is OFF or 12 volts when the output is ON, the PCM sets DTC P1660. DTC P1660 is used to monitor the fault line of the cooling fan control relay output. See this thread, it explains the cooling fans well, I posted schematics in it and went into a discussion of their operation Cooling Fan Thread with Schematic Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
BodybyFisher Posted July 22, 2008 Report Share Posted July 22, 2008 what does the coolant sensor do and could that affect this situation?? Why do you ask this question?, the coolant sensor sends the coolant temp to the PCM inducing the PCM to take certain actions, like turn on the fan, go into closed loop, etc just read somewhere that can cause overheating should i change the thermostat again By the way, a bad coolant sensor will set a code Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
Ranger Posted July 22, 2008 Report Share Posted July 22, 2008 If you pulled the purge line and no coolant is flowing, there is air in the system. If the purge line is not clogged, then the air is being injected internally (bad head gasket). How was it tested? Forget the Thermogasket idea. It won't work. Link to comment Share on other sites More sharing options...
sucker4caddys Posted July 22, 2008 Author Report Share Posted July 22, 2008 If you pulled the purge line and no coolant is flowing, there is air in the system. If the purge line is not clogged, then the air is being injected internally (bad head gasket). How was it tested? Forget the Thermogasket idea. It won't work. was tested with chemical purge line is the small hose out of the overflow tank?? if the headgaskets were bad would it cool down and run normal or would it just overheat??? the car runs normal most of the drive overheats then back to normal thermogaskjet has a money back gaurante cant hurt if the head gaskets are already blown can it??? Link to comment Share on other sites More sharing options...
BodybyFisher Posted July 22, 2008 Report Share Posted July 22, 2008 Let me summarize this thread, here is what he said was done so far: changed my thermostat bought a new cap from dealer had it checked for the head gaskets none blown thus far. said he had some chemical to test the coolant with took off the purge hose at idle little bit of air pushed out for a couple of seconds then coolant ran out all codes are history ddm u1255 b1324 pcm p1660 rim u1255 vtb b3055 thanks I think this is a cooling fan issue, due to the P1660 code: DTC P1660 Cooling Fan Control Circuits Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
BodybyFisher Posted July 22, 2008 Report Share Posted July 22, 2008 If you pulled the purge line and no coolant is flowing, there is air in the system. If the purge line is not clogged, then the air is being injected internally (bad head gasket). How was it tested? Forget the Thermogasket idea. It won't work. was tested with chemical purge line is the small hose out of the overflow tank?? if the headgaskets were bad would it cool down and run normal or would it just overheat??? the car runs normal most of the drive overheats then back to normal thermogaskjet has a money back gaurante cant hurt if the head gaskets are already blown can it??? Please stop with the thermogasket. Would you have heart by pass surgery if you had indigestion? YOU HAVE A COOLING FAN CODE, COOLING FANS COOL THE COOLANT, IF THE COOLANT IS NOT COOL, YOU WILL OVERHEAT... I am done here until that CODE IS RUN DOWN. CODES SET FOR A REASON, WHY ARE WE IGNORING A COOLING FAN CODE??? and talking about HEAD GASKET SEALANT that is SNAKE OIL? WTF? WHAT AM I NOT SEEING HERE? Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
sucker4caddys Posted July 22, 2008 Author Report Share Posted July 22, 2008 If you pulled the purge line and no coolant is flowing, there is air in the system. If the purge line is not clogged, then the air is being injected internally (bad head gasket). How was it tested? Forget the Thermogasket idea. It won't work. was tested with chemical purge line is the small hose out of the overflow tank?? if the headgaskets were bad would it cool down and run normal or would it just overheat??? the car runs normal most of the drive overheats then back to normal thermogaskjet has a money back gaurante cant hurt if the head gaskets are already blown can it??? Please stop with the thermogasket. Would you have heart by pass surgery if you had indigestion? YOU HAVE A COOLING FAN CODE, COOLING FANS COOL THE COOLANT, IF THE COOLANT IS NOT COOL, YOU WILL OVERHEAT... I am done here until that CODE IS RUN DOWN. CODES SET FOR A REASON, WHY ARE WE IGNORING A COOLING FAN CODE??? and talking about HEAD GASKET SEALANT that is SNAKE OIL? WTF? WHAT AM I NOT SEEING HERE? bringin to mechanic tomorrow to see whats up with the code. sorry about thermogasket just tired of banging my head into the wall, lets see what happens tomorrow hopefully some answer thanks for all your time love this site u guys are awesome Link to comment Share on other sites More sharing options...
BodybyFisher Posted July 22, 2008 Report Share Posted July 22, 2008 Good Luck, you can print this out and give it to your mechanic, I will try to look into the P1660 so more and see what I can find.. You have done a lot of diagnosis at this point this will help your mechanic... Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
Ranger Posted July 22, 2008 Report Share Posted July 22, 2008 IF it is a head gasket problem, it is because the threads pulled and thus lost clamping force. NO snake oil repair in a bottle will help that. IF it is a head gasket in it's early stages, yes it would cool back down. That would eventually get worse until it just plain overheats, pukes coolant and will not cool down. Link to comment Share on other sites More sharing options...
pabickwermert Posted March 10, 2009 Report Share Posted March 10, 2009 You said the head gasket checked out ok Is the coolant at least 50%/50%? Do the fans turn on with the AC, and if the AC is off, do the fans turn on at 228 and off at 217? Does the system hold pressure?, squeeze upper hose when engine is at operating temp How does the WP belt and tensioner look? Is the belt cracked, missing sections or does it look like it is glazed from slipping? Is it the correct cap? Did you check to see if coolant was flowing from the bleed line at the surge tank? That is the first thing I would do, if the bleed line is clogged you won't get the air out. Wow, I do not know about thier cady, but you just fixed mine with the last line of your answer. I have a 1999 Seville SLS. I just purchased it for 2000.00 hoping I could fix it. I removed that hose and there was no flow. I followed the hose to the metal pipe that goes through the throttle body, and then comes out, and changes back to rubber before it attached to the nipple beside the upper radiator hose. I then took off that hose and there was no blockage from that point to the other point, so I started looking at the hose nipple. I took a 6 inch piece of metal hanger and procedded to insert it into the opening I felt the blockage. I then worked the hanger a few times and now it flows out normally. I re-attached everything and now it does not over heat. I did do the exhaust chemical test before this and it was clean. I will re-check it in a few days to make sure. I plan on taking it on the highway tonight after work for a good test drive. So far driving around in the city around 50, it is doing fine and there is one spot I get to about 60, but 70 is my goal tonight for a good 10-15 miles just to make sure. Thanks again for suggesting this fix to the other person. It was easy and cheap! By the way, I did not mean to hi-jack this thread, I just want to say thanks. Paul Link to comment Share on other sites More sharing options...
Texas Jim Posted March 11, 2009 Report Share Posted March 11, 2009 Paul, Welcome to the forum. Glad you found some info that helped you. Link to comment Share on other sites More sharing options...
Ranger Posted March 11, 2009 Report Share Posted March 11, 2009 So let me get this straight. You got a '99 SLS cheap because someone thought that the head gasket was bad and it was just a clogged purge line? SWEET! Link to comment Share on other sites More sharing options...
JimD Posted March 11, 2009 Report Share Posted March 11, 2009 Information is power. Free information is not taxable. Jim Drive your car. Use your cell phone. CHOOSE ONE ! Link to comment Share on other sites More sharing options...
winterset Posted March 11, 2009 Report Share Posted March 11, 2009 Awsome. - although you took a chance spending $2000 on a 10 yr old caddy that could have had a HG failure. make sure you read thru this board to do the necessary things to keep a 10 yr old NS engine (unknown history) running. example - drain & fill the dexcool ASAP & add the bars stop leak as required. It's a shame when people don't finish the thread - especially the long ones. did this turn out to be a fan issue, or was it a head gasket? - car was going to the mechanic, then the thread stopped. I feel cheated Link to comment Share on other sites More sharing options...
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