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Found 17 results

  1. It is important to note that you will see wider fluctuations in engine temperatures with the AC off because the fans cycle on at 229 and off below 216 with the AC off. This will be true if the AC is disabled due to low refrigerant. With the AC on and operational, the fans are on low full time. The following details the cooling fan operation. The PCM will command fan operation when: Low Speed Fan Operation Engine coolant temperature exceeds approximately 106°C (229°F). Transmission fluid temperature exceeds 150°C (302°F).
  2. Hi All, I haven't been on the forums for a while - life has been busy, and the DTS has been running great (around 105k miles)! Until tonight. I pulled into the driveway after a 25 minute drive home (80°F ambient temperature), windows down (A/C off), I got the message "AC off due to high engine temp" or something similar. After I turned off the car, both rad fans continued to run for a couple minutes. After dinner, I went back outside and noticed coolant under the driver's side of the car (approximately below the water pump). I plugged in my OBDLink MX and turned on the igni
  3. Hello folks I own a 1999 Cadillac Deville and I was told by my mechanic that I have a blown headgasket... We have tried using blue devil headgasket sealer which worked for about 1 day and then the overheating appeared again. I was quoted by my mechanic that the job to fix the engine would cost anywhere between 2500-5000 dollars depending on the severity of the damage. Coolant was replaced thermostat was replaced... unfortunately this did not fix the issue I rely on my Cadillac heavily for work and I need a inexpensive fix and fast one ASAP that will last me and not pillage
  4. Have a 97 Deville, had been leaking coolant slowly, after engine had warmed up it was dripping by passenger front tire ( down the boot area), also associated with? AC would only blow hot air. Took it in, was told that I needed a new thermostat and a backflush told them to do it if it would fix problem. Now over a 20 mile trip had to pull over 3 times as engine was too hot to drive, had to add coolant as was low. Is it possible that they put a bad thermostat in or should I be worrying more that either they screwed something up when they worked on it or a new problem has arisen? I took it b
  5. I have a leftover GATES (US/made in Mexico) Part Number K030245 Micro-V that is brand new, never used. Would gladly mail it to you for free if you PM your address to me. Looks like former part number may be 3PK625. This belt probably fits all years of Northstar production. I only have one, so first person gets it.
  6. ...just got my '98 DeVille back from the shop. Had an issue last week with overheating. Followed the digital prompts and by stopping to let the engine cool every few miles and adding coolant (with the radiator cap off like an "open" system) I made it home okay. No indication of water in the oil, so the head gasket appears to have survived. ...shop discovered that the water pump idler pulley was shot and had thrown the belt. I couldn't see anything wrong when I popped the hood because the water pump doesn't run off the main serpentine, but off the other end of the cam under its own covering
  7. Hello, I am looking for help to solve an overheating problem on my 1996 Cadillac Eldorado ETC. The car reaches operating temperature in a normal amount of time. It Does not leak coolant or overheat while idling. It does not leak coolant or overheat at freeway speeds. However, the car does leak coolant and then overheat in "stop and go" traffic or areas with frequent stops or red lights. The overheating is caused by a loss of coolant leaking from the expansion tank outlet hose. If the car is refilled with new coolant, it returns to operating temperature. My question is what causes the coolant
  8. Not low on coolant. The norm for the last 6 months has been just above halfway on the temp gauge due to crank sensor issues and a check engine light. Also now low on Freon so computer shuts AC off and gives me a text message on the dash.... No problems when driving at any speed above 20 MPH. However, when sitting in a drive thru line, the temp gauge begins to rise. It has not overheated yet, but it had been 3/4 to the red mark (where I either shut it down or start driving ) I listened for the fan motor, but don't hear it running. However it does seem to turn at a slower speed. It it a sim
  9. I have a 98 Deville with a 4.6L v8 northstar. About a week ago, my car overheated. Let it cool down and turns out, all my water was gone! So, I found out that once the car gets up to running temp, pressure is pushing water out of the overflow tube, (there is only one reservoir with a tube right by the cap) untill there is no water left! Checked my oil, it's clean so I'm hoping it's not a faulty head gasket. But I think its weird that water is just coming right back out? Somebody please help me.. This car is the love of my life, but if I'm looking at over $3,000 in labor cause of a HG I thi
  10. With the recent warmer temps >70 I've been seeing the temp gauge rise at idle @5/8 on the gauge the fans kick into high speed but temps continue to climb. I pulled the purge line/orifice and ran a drill through it maybe some small crud but it wasn't blocked. Back in the fall I had a crack in the passenger side tank and replaced the radiator but recall the core not being as thick as the original - I'd have to get the micrometer out but maybe 1/8-3/16" smaller, so possibly the radiator cooling capacity is lower. At the same time changed the t-stat(supposedly fail open) it was different sty
  11. My 96 Deville keeps overheating.. I've tested the heads for leaks.. passed. changed the tstat twice. put new radiator hoses. flushed the radiator and the engine. This has been over the corse of 3 weeks. everytime i change a part or add new fluid she runs fine for two days an then will not cool down. fans work properly, no leaks. When it runs hot the hoses are full af fluid and tight as if there is no circulation hense the change of the tstat.. like i said, ran fine for 2 days and did the same thing. tried flushing the system thinking there was a clog but again, after i was done she ran fine fo
  12. I have a 1996 Cadillac DeVille Concour Sedan with a 4.6 Liter 8 Cylinder Northstar Engine that has 74,389 miles on it. Recently, it started leaking coolant approximately under the front center of the car. I applied a product called BARS LEAKS RADIATOR HEAVY DUTY LEAKS additive and it worked for about two months. The problem arised again recently and I did the same thing but the results was unsuccessful. The tank had become half filled with these pellets and now the coolant is leaking at a much faster rate then before. I was wondering if there is a way to replace the leading tube on the bottom
  13. Hello, Fellow Caddy enthusiasts! New member here... Actually, this is my first post ever(Hopefully it's in the right place ) ! Anyway, I am posting this because I've been having some issues with the coolant system on a 98 STS... O.k. So, I AM aware of the head-gasket failure on this car and that was the first thing that I had diagnosed; It was done by a professional mechanic, GM certified(if that matters)! Also, tried to have the shop flush the radiator/coolant system... The rest of the work I did myself!? I'm NOT a mechanic but, I am fairly sensible and know my way around a wrench pretty w
  14. Here's the deal, my 97 northstar has been getting hot and not sure what to do. Replaced the thermostat, did not get a flush kit but drained the system and ran a ton of water through it with a hose. It has been doing ok at highway speeds. I can drive like half an hour on the highway and then come to a stoplight and sit and the temp starts rising and my oil pressure light flashes off and on. Seems to overheat at a a stand still. on the other hand, i started it and let it idle for 30 minutes in the driveway and it was fine. Oil is not milky so I do not think this is related to head gasket proble
  15. I am interested in buying a 97 or 98 cadillac sls with an overheating problem,it has the v-8 northstar engine,the car and transmission are great condition,interior and paint is great,newish tires,tags are 2 years out now,whats the value of this car with an engine that only drives 10 miles before overheating? If i did buy this car what types of engines are compatible with it? I dont mind looking towards a camaro engine,Is there any way of making this car rear wheel drive? I want to make this cadillac a beast
  16. I recently redid all my brakes. I replaced all 4 rotors, all the pads. It wasn't too difficult and I want to say that I did everything correctly. But! I took the care for a test drive and everytime I let off the accelerator the car would decelerate significantly. I did a few hard stops. Might have helped a little, not sure. I put the parking brake on and off a few times. I think that made it a bit better as the car would coast a ways without slowing down as much. I drove it around a bit longer and then parked it at home, and my neighbor in the driveway getting her mail could smell/ feel the
  17. I just brought a '97 D'elegance yesterday for $1,000 in Maryland. It overheats almost immediately. Every time I drive it the temperature shoots up pretty fast around 244F in about 5-10 minutes or so. What did I get myself into? I think I got got. Oh well. What are some fixes? I dumped $135, for a battery, $240 for MDTags, $10 for tool kit to put in battery and tags, $ 368 for 1st and last months insurance. As well as the $1,000 for the car. I'm felling stubborn. I want to make it work. I refuse to just have wasted almost $2,000 in less than 24hrs!
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