sucker4caddys Posted July 21, 2008 Report Share Posted July 21, 2008 just changed my thermostat [1999 seville]per my mechanic. car was overheating so i had it checked for the head gaskets none blown thus far. was told to change thermo so did, then was told to bleed out the air by running car with cap off and heat on. tried to do so but still seems like there is an air pocket in there. after car gets hot hot air starts to blow out cold then antifreeze boils over. thought i fixed yesturday ran fine for 1.5 hours. today did the same thing. bought a new cap from dealer but is 18 psi and old one is 15 any diffrence? getting tired of banging my head into the wall any input would be much appreciated. thanks should i flush out the system and start over?? Link to comment Share on other sites More sharing options...
Marika Posted July 21, 2008 Report Share Posted July 21, 2008 just changed my thermostat [1999 seville]per my mechanic. car was overheating so i had it checked for the head gaskets none blown thus far. was told to change thermo so did, then was told to bleed out the air by running car with cap off and heat on. tried to do so but still seems like there is an air pocket in there. after car gets hot hot air starts to blow out cold then antifreeze boils over. thought i fixed yesturday ran fine for 1.5 hours. today did the same thing. bought a new cap from dealer but is 18 psi and old one is 15 any diffrence? getting tired of banging my head into the wall any input would be much appreciated. thanks should i flush out the system and start over?? From my own experience don't assume the head gasket is OK just because the mechanic says so. I went from one mechanic to another, including an excellent dealership and they all told me my engine's head gasket was OK. They were WRONG. Get your engine oil tested. If there's antifreeze getting into the oil it will show up in the test. $22.50 at http://www.blackstone-labs.com They will save you a ton of money on repairs and answer all the questions you may have regarding the internal condition of your engine. 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...
BodybyFisher Posted July 21, 2008 Report Share Posted July 21, 2008 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. 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...
JimD Posted July 21, 2008 Report Share Posted July 21, 2008 You suspect air in the engine coolant system. The system is designed to be 'self-purging' as to air. A reliable test of the purge function is removing the 1/4" rubber coolant hose from the upper level of the coolant reservoir (cold engine at idle RPM) and observe a steady stream of coolant from the hose. If coolant flows from that hose, any air in the engine cooling system will be purged (eliminated) within minutes. If you do not see coolant flowing from that hose, the most likely problem is a blockage at the 'hollow bolt' where the air purge line connects to the coolant crossover/water pump mounting point. The hollow bolt is also used to fasten an engine lift bracket to the left side (driver's side). Remove that hollow bolt and make certain the coolant purge flow is not restricted. Tell us what you observe. Jim Drive your car. Use your cell phone. CHOOSE ONE ! Link to comment Share on other sites More sharing options...
MrEldo97 Posted July 21, 2008 Report Share Posted July 21, 2008 Check the coolant for the presence of combustion gases... Link to comment Share on other sites More sharing options...
navion Posted July 21, 2008 Report Share Posted July 21, 2008 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. I concur with BBF on the bleed line. I believe that the bleed line can become restricted over time. If the engine was pruged of air before the bleed line plugged, you may not notice it. But as soon as air is introduced into the system, the plugged bleed line prevents the air from escaping. Pull the bleed line from the surge tank, place the end in a clean soda bottle & start the engine. Coolant should flow steadily from the open end. If it does not flow, remove the line from the hollow bolt. Clean the hollow bolt with a properly sized hand held drill bit. Check to see if the rest of the line is open. Reassemble, fill surge tank to proper level & you should be good to go. If you have good flow, check to make sure the blockage is not in the surge tank it's self. If there is no blockage, check out the water pump and belt. If all is in order, then the prime suspect would be a head gasket. Good Luck, Britt Britt Link to comment Share on other sites More sharing options...
Ranger Posted July 21, 2008 Report Share Posted July 21, 2008 Keep in mind that the unrestricted purge line may not have a steady constant flow at idle, but you SHOULD see some flow. Increased RPM = increased flow. Link to comment Share on other sites More sharing options...
sucker4caddys Posted July 21, 2008 Author Report Share Posted July 21, 2008 took off the purge hose at idle little bit of air pushed out for a couple of seconds then coolant ran out. after that i drove the car for about 1 hr. temp gauge went from 1/2-3/4 back and fourth the whole time. at one point message engine hot turn ac off ac was already off then temp gauge went back to 1/2. after i did the thermostat i forgot the pellets should i redo using the pellets i also was going to get some thermo gasket (anything is possible) mechanic still thinks there is air in the system. belt looks good radiator hose is very hot when idling can see coolant bubling in overflow when really hot. fans come on when ac is on and also when temp rises. when i raise the rpm at idle coolant sucks down then returns to level. thanks for the input guys. Link to comment Share on other sites More sharing options...
JimD Posted July 21, 2008 Report Share Posted July 21, 2008 took off the purge hose at idle little bit of air pushed out for a couple of seconds then coolant ran out. If the purge system is operating as designed, there should not be any air in the plumbing at all; not even a little bit. Can you confirm that the inlet fitting at the top of the reservoir is not plugged up with something? Jim Drive your car. Use your cell phone. CHOOSE ONE ! Link to comment Share on other sites More sharing options...
BodybyFisher Posted July 21, 2008 Report Share Posted July 21, 2008 What is thermo gasket? Head gasket sealer? 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 21, 2008 Author Report Share Posted July 21, 2008 What is thermo gasket? Head gasket sealer? yeah i heard some good stuff on it. mechanic said no head gasket problems but running out of ideas unhooked the purge line on top of res while was hot and steam and pressure shot out. if the headgasket was bad wouldn t the car overheat and not cool down to normal tem? and why doesnt the heat work when temp gets real hot but normal temp heat is normal? way confused thanks guys Link to comment Share on other sites More sharing options...
BodybyFisher Posted July 21, 2008 Report Share Posted July 21, 2008 What is thermo gasket? Head gasket sealer? yeah i heard some good stuff on it. mechanic said no head gasket problems but running out of ideas unhooked the purge line on top of res while was hot and steam and pressure shot out. if the headgasket was bad wouldn t the car overheat and not cool down to normal tem? and why doesnt the heat work when temp gets real hot but normal temp heat is normal? way confused thanks guys Did you check to see if the nipple in the TANK was clogged? How did your mechanic check the head gasket? 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...
lothos Posted July 21, 2008 Report Share Posted July 21, 2008 I know BBF already stated this, but are you sure your coolant mixture is 50/50? That seems to be pretty important on these cars. I've also read on this forum not to use head gasket sealer. WARNING: I'm a total car newbie, don't be surprised if I ask a stupid question! Just trying to learn. Cheers! 5% discount code at RockAuto.com - click here for your discount! Link to comment Share on other sites More sharing options...
sucker4caddys Posted July 21, 2008 Author Report Share Posted July 21, 2008 What is thermo gasket? Head gasket sealer? yeah i heard some good stuff on it. mechanic said no head gasket problems but running out of ideas unhooked the purge line on top of res while was hot and steam and pressure shot out. if the headgasket was bad wouldn t the car overheat and not cool down to normal tem? and why doesnt the heat work when temp gets real hot but normal temp heat is normal? way confused thanks guys Did you check to see if the nipple in the TANK was clogged? How did your mechanic check the head gasket? said he had some chemical to test the coolant with. which nipple would that be . also he checked exhaust. Link to comment Share on other sites More sharing options...
Marika Posted July 21, 2008 Report Share Posted July 21, 2008 Have you pulled the codes (if any) by chance? 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 know BBF already stated this, but are you sure your coolant mixture is 50/50? That seems to be pretty important on these cars. I've also read on this forum not to use head gasket sealer. used peak full concentrate antifreeze and coolant cut with half water. thermo gasket says can be used with the northstar and has a money back warranty last resort of course. Link to comment Share on other sites More sharing options...
sucker4caddys Posted July 21, 2008 Author Report Share Posted July 21, 2008 Have you pulled the codes (if any) by chance? no will something show up in the codes?? Link to comment Share on other sites More sharing options...
Marika Posted July 21, 2008 Report Share Posted July 21, 2008 Have you pulled the codes (if any) by chance? no will something show up in the codes?? Possibly. 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 Have you pulled the codes (if any) by chance? no will something show up in the codes?? Possibly. all codes are history ddm u1255 b1324 pcm p1660 rim u1255 vtb b3055 thanks Link to comment Share on other sites More sharing options...
BodybyFisher Posted July 21, 2008 Report Share Posted July 21, 2008 QUOTE all codes are history ddm u1255 b1324 pcm p1660 rim u1255 vtb b3055 thanks Here might be your problem 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...
Marika Posted July 21, 2008 Report Share Posted July 21, 2008 I'll take a bow now... 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...
BodybyFisher Posted July 21, 2008 Report Share Posted July 21, 2008 DTC P1660 Cooling Fan Control Circuits Refer to Engine Controls Schematics for wiring view. Circuit Description 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. Conditions for Running the DTC Ignition voltage between 10 and 16 volts. PCM in Closed Loop fuel control. Engine running for at least 10 seconds. Conditions for Setting the DTC Fault line is low for 2 seconds. Action Taken When the DTC Sets The PCM will illuminate the Malfunction Indicator Lamp (MIL) when the diagnostic runs and fails. The PCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Freeze Frame and Failure Records. Conditions for Clearing the MIL/DTC The PCM will turn the MIL OFF after three consecutive drive trips that the diagnostic runs and does not fail. A Last Test Failed (current) DTC will clear when the diagnostic runs and does not fail. A History DTC will clear after forty consecutive warm-up cycles with no failures of any emission related diagnostic test. Use a scan tool to clear DTCs. Interrupting PCM battery voltage may or may not clear DTCs. This practice is not recommended. Refer to Clearing Diagnostic Trouble Codes in PCM Description and Operation. 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 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... 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...
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!! 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...
BodybyFisher 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 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...
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