Jbird06410 Posted May 29, 2008 Report Share Posted May 29, 2008 Help! Car is overheating all of a sudden. I thought it was the thermostat. I brought it to my mechanic. He changed the thermostate, flushed the coolant, replaced the radioator cap, checked the hoses. He runs the car for a while and the car heats up again. So he thought it was the head gasket so he pressure tested the collant system and compression tested each piston and it passed. It was not the head gasket. Sooo then they thought water pump so they replaced it. Same problem. What else could it be? Link to comment Share on other sites More sharing options...
BodybyFisher Posted May 29, 2008 Report Share Posted May 29, 2008 I dont know why they change water pumps for overheating, they LEAK thats all, they don't cause overheating Check the purge line, you will find an end connected to the tank, its a hose, pull it off and see if you have a coolant stream coming out.. VERY IMPORTANT, if the purge line is clogged air will not get out of the system and you will cavitate How are the cooling fans? Did they check for combustion by-products? 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...
Jbird06410 Posted May 29, 2008 Author Report Share Posted May 29, 2008 Thank you for the response! The fans are fine. They saw no problems with the fans. They just called and they will be doing that test. (apparently they got a call back from GM who said to do the test). They already checked the purge line. I have the car repairs under warrenty just not the diagnotic fees....we are up to $1000 between the water pump and these guys trying to figure out what the problem is. (waterpump not covered) I just fixed the traction control light (myself with the forum help) two days later the car starts overheating. The car gods were angered by my triumph. Link to comment Share on other sites More sharing options...
BodybyFisher Posted May 29, 2008 Report Share Posted May 29, 2008 Well keep your fingers crossed, if you have combustion by-products come back to this board for direction. They MAY say that time-serts are NOT covered by the warranty.... be careful.. YOU MUST TIME-SERT!, if you replace head gaskets 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 May 29, 2008 Report Share Posted May 29, 2008 jbird, check out this thread, apparently his purge line was clogged, Mike http://caddyinfo.ipbhost.com/index.php?sho...=17865&st=0 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...
Jbird06410 Posted June 3, 2008 Author Report Share Posted June 3, 2008 ok - Here's the latest.....It is the headgasket. Soooo we have the warranty on the drivetrain. The warranty people are telling me that they do not cover internal leaks only external leaks....what the heck?!?!? Link to comment Share on other sites More sharing options...
Ed Hall Posted June 3, 2008 Report Share Posted June 3, 2008 I'm sorry to hear about that. When was the last time you had the coolant changed? Unfortunately, this is the 3rd year 2000 and newer Northstar that we've heard this week that has had head gasket problems. This engine was supposedly redesigned starting in year 2000 to make it more immune to head gasket problems but as these cars age, we are starting to hear that these redesigned engines also are having problems. I used to recommend only year 2000 and newer Cadillacs because I felt the redesign might have fixed the problem but I might have to rethink this. It sounds like the warranty people are trying to extract themselves from this costly procedure. It costs about $3-$4k to replace the head gaskets and Timesert the block. Make sure if they do they work that all the head gasket bolt holes are Timeserted or it'll fail again. I guess if they refuse to cover internal leaks, you might have to drive the car until it overheats so severely that those internal leaks turn into external leaks. Link to comment Share on other sites More sharing options...
Jbird06410 Posted June 3, 2008 Author Report Share Posted June 3, 2008 The coolant was changed beginnig of May when I had the changed the thermostat changed. I bought the car in March. It was a dealer car. The carfax showed that it was very well cared for....this seriously sucks. Link to comment Share on other sites More sharing options...
fivepointohman Posted June 3, 2008 Report Share Posted June 3, 2008 The coolant was changed beginnig of May when I had the changed the thermostat changed. I bought the car in March. It was a dealer car. The carfax showed that it was very well cared for....this seriously sucks. Sorry to hear about your gaskets... It's been a bad week for this... Link to comment Share on other sites More sharing options...
adallak Posted June 3, 2008 Report Share Posted June 3, 2008 Unfortunately, to some of us it makes sense rather buying a used Cadillac with known headgasket problem and fixing it, than playing Russian roulette. The saddest thing in life is wasted talent Link to comment Share on other sites More sharing options...
MrEldo97 Posted June 4, 2008 Report Share Posted June 4, 2008 The headbolts have pulled out of the block and the block will have to be Timeserted. NOTHING ELSE WORKS!!! Same thing happened to me 18 moths ago at 91449 miles. I made the repair myself and 18 moths and 17.5 k miles and everything is fine. The warranty people are trying to weasel their way out of paying for this repair. The headgaskets don't leak; the headbolts pull the threads right out of the block. This is the position you need to take with those warranty worms. We can walk you through this... It sucks but it isn't the end of the world. Link to comment Share on other sites More sharing options...
BodybyFisher Posted June 4, 2008 Report Share Posted June 4, 2008 The headbolts have pulled out of the block and the block will have to be Timeserted. NOTHING ELSE WORKS!!! Same thing happened to me 18 moths ago at 91449 miles. I made the repair myself and 18 moths and 17.5 k miles and everything is fine. The warranty people are trying to weasel their way out of paying for this repair. The headgaskets don't leak; the headbolts pull the threads right out of the block. This is the position you need to take with those warranty worms. We can walk you through this... It sucks but it isn't the end of the world. This is a good point, its NOT internal leaking, its a damaged BLOCK, where the bolt threads pulled out..., this is NOT an internal leak. An example of an enternal leak is on the 4.9, where coolant gets into the oil because of the cylinder sleeve o-ring. 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...
Jbird06410 Posted June 27, 2008 Author Report Share Posted June 27, 2008 Update......The dealer we bought the car from cut us a deal on the repair....$2700 for the headgasket alone...we asked for it to be Timeserted as suggested by this forum... brought the cost to $4065. Total cost to date will be around $5000. (The roof for the house has to wait till next year.) We have them taking pictures of the process. So we can prove it was done. Good news is that the rest of the engine looks in great shape. I have been without a car for going on a month. I get it back Monday...I cannot wait. Thanks for all the great responses! Link to comment Share on other sites More sharing options...
BodybyFisher Posted June 27, 2008 Report Share Posted June 27, 2008 Sorry to hear about the expense, that seems like a lot of cash for timeserting but the kit alone is $400, plus the additional time to install them. If they do the job correctly, you will have a bullet proof engine. Good Luck with this and report back the results. 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 June 27, 2008 Report Share Posted June 27, 2008 PS, what happened with the warranty company?, are they picking any of this up? 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...
MrEldo97 Posted June 27, 2008 Report Share Posted June 27, 2008 The price isn't out of line. Tampa Caddy dealer quoted me 5 large for that job as well. What p!$$es me off is how the nimrod dealer can quote 2700 for headgaskets when they wouldn't be able to torque the headbolts! Essentially you'd be paying $2700 for nothing. Flat rate again. I would bet my Eldo that the greedy dealer is quoting you the book rate of $2700.00 for a "headgasket replacement" (which can't be done) and then the flat rate to Timesert the block on top of it! Dealerships are such liars and thieves!!!!!!!!! Link to comment Share on other sites More sharing options...
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