Question about 1997 Cadillac DeVille

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Overheating car overheats mostly when the air condition turns on,and when it sit in traffic for 3=-5 minutes, i change all hoses,check fuse,but still encounter this problem,what should i do to get rid of this problem, i dont want to change the car,? jack mcdaniel.

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  • dbom86si Aug 10, 2008

    having the same problem for my 96 deville?

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Check the cooling fan relays-there are three of them.

Posted on Aug 18, 2008

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My 2010 dodge journey is running hot and the heater is blowing cold air. Temp goes back down to normal while driving. No indicator lights r on. Is it the thermostat or heater core?


Most likely neither is the problem, to verify the heater core is ok go under the hood and touch the heater core coolant supply hoses (hot engine) one will be really hot and one a little cooler, if this is the case the heater core is ok and you have another problem, that other problem is most likely a failed part or parts called the air temperature control blend door motor or door is defective. Also I doubt the engine is overheating, it gets hotter while sitting in traffic because the electric fan that cools the engine only comes on at about 225 degrees Fahrenheit. If you had an overheat condition the check engine light would also come on to alert you of the overheating condition.

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Help with car overheating


My guess is that it overheated while you where sitting in traffic and since the fan couldn't come on the vehicle overheated. With the transmission codes and all that you have going on I'm afraid there isn't such a thing as a quick fix. How bad did it overheat and did the misfire codes come before or after overheating? Im trying to determine if you could possibly have a head gasket issue.

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1 Answer

Cooling system


For car running hot and overheating issues, I suggest to you go through this help links.

Click this link below and go through the troubleshooting procedure to take care of the problems: ----



Car runs hot?

http://howtobyme.blogspot.com/2011/11/car-runs-hot-in-traffic.html
-----------

All types of car overheating problems and troubleshooting?

http://technoanswers.blogspot.com/2011/11/all-types-of-car-overheating-problems.html
---------

Car freeze overnight and started overheating while driving?

http://technoanswers.blogspot.com/2012/01/car-freeze-overnight-and-started.html

-----------



Engine Overheats and heater blowing cold?

http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html

---------------------------

Car overheats and Air blows hot at idle?
http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html
--------

overheating?

http://schematicsdiagram.blogspot.com/2011/12/buick-century-overheating.html
----------

Car engine Overheats and transmission starts slipping?

http://schematicsdiagram.blogspot.com/2011/12/car-engine-overheats-and-transmission.html
----------This details will help.Thanks.

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1 Answer

Where is the heater fan switch located


For car running hot and overheating issues,i suggest to you go through this help links. Click this link below and go through the troubleshooting procedure to take care of the problems :----Car runs hot? http://howtobyme.blogspot.com/2011/11/car-runs-hot-in-traffic.html
-----------All types of car overheating problems and troubleshooting?

http://technoanswers.blogspot.com/2011/11/all-types-of-car-overheating-problems.html
Car freeze overnight and started overheating while driving? http://technoanswers.blogspot.com/2012/01/car-freeze-overnight-and-started.html-----------Engine Overheats and heater blowing cold?

http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html

---------------------------

Car overheats and Air blows hot at idle?
http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html
--------overheating? http://schematicsdiagram.blogspot.com/2011/12/buick-century-overheating.html
----------Car engine Overheats and transmission starts slipping? http://schematicsdiagram.blogspot.com/2011/12/car-engine-overheats-and-transmission.html
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1 Answer

98 deville 32 valve North Star OVERHEATS after 33 miles of drive ?? does not overheat in town overheats out on highway and after slowing down- fans dont cool motor unless stop engine ,have changed radiator...


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.
Also note that the cooling fans don't come on until the coolant temperature hits around 225 degrees.
During normal highway driving the fans will very rarely come on(if at all) due to constant air flow through the radiator.They will only usually come on in heavy traffic conditions on a hot day.
But......if you have the Air Con switched on, the fans will run all of the time.

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2 Answers

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If you haven't flushed your radiator, i would recommend this asap. i would also inspect the water pump and thermostat as well. replace both components if found to be faulty.

Make sure the cooling fan is operational. it should cycle on and off if the air condition is activate.

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