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Cadillac STS/STS-V Maintenance & Repair

85 messages,  Last post on Nov 23, 2009 at 6:40 AM

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What is this discussion about? Cadillac STS, Cadillac STS-V, Sedan

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#65 of 85 Re: Northstar Coolant Loss [klerk183] by dyates773 Oct 01, 2007 (8:50 am)
Replying to: klerk183 (Jun 17, 2007 1:40 am) This type of head gasket leak is very rare. Only the high pressure combustion gases seem to pass into the coolant system. If anything other than a tiny amount leaked into the cylinder head, upon cold startup the engine could misfire if the spark plug was wet. My experience and research says the coolant doesn't leak from the engine, only from the tank.
#66 of 85 1998 STS Heater problem by don2119 Oct 11, 2007 (5:04 am)
A/C blows cold, but when I try to use the heater it just blows cold. I checked all fuses Ok. What should I be looking for? Replies to this message: dyates773 (Oct 16, 2007 8:25 am)
#67 of 85 Re: 1998 STS Heater problem [don2119] by dyates773 Oct 16, 2007 (8:25 am)
Replying to: don2119 (Oct 11, 2007 5:04 am) Look for low coolant level or air in the system. Your low coolant sensor is in the bottom of the fill tank. There is an electrical connector that could be off if you have no low coolant indicator on the dash but the tank is in fact low. One last item, the STS thermostat allows water to flow back to the engine, which is the reverse of moast engine designs. The Northstar relies of a very high recirculation of coolant.
#68 of 85 2000 sts inter light problem by mb500 Jan 03, 2008 (11:43 am)
I have a 2000 sts.The lights on the steering wheel and overhead console are out.Anyone know the problem.
#69 of 85 2000 Cadillac STS Coolant Problems and Dim Lights by injmad Sep 25, 2008 (3:11 pm)
My 2000 Cadillac STS has been saying coolant low...It has even overheated on time while on the highway with the AC on. It said Engine Hot...Shutting down AC. It had no smoke...I let it cool down and I put coolant in it...It started saying low coolant within a week or so...Still can't run ac for very long...before engine gets hot. Only one time I noticed a small amount of coolant on the garage floor. Mechanic can not find a leak...said to replace the radiator cap. That may help? Now the interior lights keep going dim...I can not see the digital speedometer or the clock. during the day and at night and then sometimes it jsut comes on...then off again???? Is this the alternator? What could this be...My father is a mechanic and so is my brother-in-law and funny but know one can tell me what is wrong!!! HELP! Replies to this message: sls002 (Sep 26, 2008 9:23 am)
#70 of 85 Re: 2000 Cadillac STS Coolant Problems and Dim Lights [injmad] by sls002 Sep 26, 2008 (9:23 am)
Replying to: injmad (Sep 25, 2008 3:11 pm) My guess is that coolant is leaking from the head gaskets or the head gaskets are blown/leaking. You need a better mechanic, I suggest going to a Cadillac dealership with a decent service department. Replacing the head gaskets will cost about $2000 or so is my guess. Replacing the engine will be more.
#71 of 85 96 seville by lac601 Oct 12, 2008 (4:43 am)
I have a 96 seville, runs good until you get to about 65mph. Then the rear right wheel start vibrating and bouncing up and down. As speed increases vibration gets worse. Hit a bump and car wants to sway badly. Wheel bearing, stablizers, everything appears to be tight. Is there any idea what this could be. Thanks!!!
#72 of 85 Re: Fuel Leak, Engine Compartment [audioflirt] by pjolly Nov 23, 2008 (2:16 pm)
Replying to: audioflirt (Jun 03, 2007 7:05 am) It could be the fuel pressure regulator.
#73 of 85 Re: Northstar Coolant Loss [dyates773] by bmrdoc Dec 02, 2008 (7:46 am)
Replying to: dyates773 (May 30, 2007 11:46 am) where do you get the air vent? which bypass hose did you put it in? Replies to this message: tommieg (Feb 24, 2009 3:25 pm)
#74 of 85 2008, is it a lemon? by cadsts Dec 04, 2008 (2:30 pm)
I have a STS 2008. Less then 10k miles and the dealer is replacing the engine due to a crack in the header. We took the car in because onstar said the tire pressure was low. The car never notifed us of this. When they looked the car over for saftey they found no coolent, it was gone. So they were going to repair it. The car nor onstar ever warned of low or no coolent. While doing the repair they found a crack in the block which means the car was overheating. The car never warned of over heating.   When asked about the sensors that did not go off, the dealer is saying it was just a fluke. My question, if just a fluke, why did it go on for so long? Normaly flukes last an hour or two, or a day, but not this long. Any ideas? The car has been in for many other repairs as well. I think the dealer is trying to keep me in the car past a year or 12k miles so I will not qualify for the lemon law. I am very frustrated.

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