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I have a 1991 Cadillac deville, and when I'm idling, my heat blows hot,but when I start driving down the interstate, it blows cold. I just put a new thermostat in it.

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  • 246 Answers

Its possible you've installed the thermostat upside down. If this is not the case, then I think you've got an air bubble in your cooling system. It could work itself out or while the engine is cooled down, you can open the radiator cap and see if its at all low on coolant.

Posted on Feb 20, 2015

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Posted on Jan 02, 2017

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  • 142 Answers

SOURCE: 1999 Caddy Deville A/C problem

A/C systems are hard to diagnose without having access to the vehicle. One of the most common problems is undercharge (Not enough freon in the system) indicating a leak somewhere in the system. Other causes could be a burnt A/C compressor clutch fuse, defective compressor clutch, defective compressor/belt, defective High/Low pressure switches in the system, defective evaporator icing switch, defective wiring... Basically, you're better off getting the system diagnosed by a good A/C knowledgeable mechanic...

Posted on Aug 13, 2008

crayzeetrayn
  • 837 Answers

SOURCE: i have a 1999 cadillac deville thats running hot

Have you replaced the drive belt(s) and/or checked the tightness of same?

Posted on Feb 07, 2009

Kravcar
  • 192 Answers

SOURCE: 96 cadillac deville overheating

Check for coolant flow at the Purge line,this is a common problem on the Northstar.
There is a small diameter hose coming from near the top of the coolant tank,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.If the hose is clear, check for blockage at the nipple on the tank.

Posted on Aug 14, 2009

roniecon
  • 6927 Answers

SOURCE: 1997 Cadillac Deville Overheating

Yes it can be the head gasket,one way to tell,is make sure the engine is cold,like in the morning.Take the rad.cap off,add water until full.Turn over the engine and let run,while looking at the opening(where the cap goes).Is the water coming out like really fast,maybe as much as a fountain?If so,then it is a head,or head gasket.If you would like to bleed system of air I can tell you how.If there is air in the cooling system,it will run hot.With it cold,or cool,not hot or real warm,fill the reservoir with water up to 3/4 full,over the fill mark.Fill the radiator full,and replace radiator cap,and reservoir cap.Make sure the hose from the reservoir to the radiator is in good shape,no holes or crimped anywhere.start the engine with the ac off.At this point the cooling fans should not be on.There not supposed to be on unless you straight wired them.Before the fans come on by themselves,or the vehicle runs hot,and right before not to soon,cut the car off.Go in the house and get on computer for about 30 to 40 minutes,and go back out side and check the water level in the reservoir.Is it down?if so add more water and repeat process until engine runs at normal temp.The fans should come on,and go off on there own,with the ac off.Let me know the out come.

Posted on Aug 29, 2009

duane_wong
  • 6826 Answers

SOURCE: my 2000 cadillac deville keep running hot when i

OK, check that the 2 fans are turning on when it gets to operating temperature. If not, replace the 3 or so relays that control the two speed fans on your car.If that doesn't solve the problem, then you may have to buy new fan motors and also have the harness replaced if necessary to make it cool reliably.

I had this problem on a 1997 Cadillac Deville Limousine that overheated over 157 deg. F and went into its limp mode for cooling the engine off by allowing 1/2 of the cylinders to circulate fresh air into the engine in case all antifreeze would leak out or the car would overheat.

Don't run the Northstar engine too long, more than 45 min. at a time in this limp mode.

Good luck on this repair of your Northstar Engine.

Posted on Jan 02, 2011

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I have a 93 Cadillac Deville when I turn on the heat it blows a 10 amp fuse and the transmission stops changing gears. What is wrong?


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76 COUPE DE VILLE NO HEAT!!! FLUSHED COOLANT SYSTEM REPLACED ANTI-FREEZE, REPLACED THERMOSTAT TO 195 DEGREES, REPLACED A/C THERMO VACUUM SWITCH, HOWEVER FLUID IS CIRCULATING THRU HEATER CORE. THERMOSTAT IS...


Feel the hoses going to heater core, one should be hot and the other warm. If one is cold or both are then heater core is clogged. Make sure heater control valve works and as vacuum to it and or the cable is free.

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Touch both heater hoses going to the heater core. They should both be hot. If they are, then the problem is probably a broken or binding blend door or bad blend door actuator. If one hose is hot and the other cold, then the heater core is clogged.

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The most common overheating problem with the Northstar engine is a blocked purge line(small hose).The purge line is designed to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank (not the cap) ,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.
If the hose is clear, check for blockage at the nipple on the tank.Or trace the hose back until you find the blockage.
The hose goes in to the engine to a crossover and comes out the other side close to the thermostat housing,the blockage may be there.

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Check the fluid.Change the fluid and filter and see if it gets better.If it does then I would recommend a fluid transfer.This will transfer the old fluid and add new fluid.Hope this helps.Good luck.

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Your radiator might have a clog and needs to be flushed...also check your water pump to see if its working right.

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