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2001 deville has no heat when idling also overheated engine light comes on

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Check the coolant level and make sure it is not low.Also does the gauge show that it is over heating?If it is low then check for leaks.If no leaks found,it could be leaking internally.Possible head gasket.You should get it checked out before there is more damage done.Hope this helps.Good luck.

Posted on Feb 01, 2010

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Dose air pockets cause 01 deville to loose heat and car to over heat?


Yes this would cause the car to oveheat. DO NOT drive this car if it is overheating!! you will damage the engine very quickly.

Jan 16, 2012 | 2001 Cadillac DeVille

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Cooling fans ok, radiator clean and clear, curious how low refrigerent could cause overheating engine?


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Sep 16, 2010 | 2001 Cadillac DeVille

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Cadilac deville 2001 runs hot when you get into stop and go trffic.


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.


Jul 02, 2010 | 2001 Cadillac DeVille

2 Answers

1997 DeVille: the car is overheating...


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.

May 18, 2010 | 1997 Cadillac DeVille

2 Answers

Cadillac dhs 2001 over heating


The most common overheating problem with the Northstar engine is a blocked purge line. It's job is to purge air out of the cooling system.
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.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 to near the thermostat housing,the blockage may be there.

Apr 08, 2010 | 2001 Cadillac DeVille

3 Answers

Our 01 devill dts is overheating new radiaor,


That car holds 8 quarts of oil. Thats why its still low. You may have head gasket problems. Find a shop that is familiar with your Northstar engine, its going to be big bucks.

Mar 11, 2010 | 2001 Cadillac DeVille

3 Answers

97 Cadillac deville only overheats on hills it has a new radiator, water pump and rad cap. it runs fine on flat roads and at idle rad fans kick on about 222 degrees.


There's a few things I'd take into consideration. As stated in other posts, yes make sure transmission fluid is up to proper level. Also, depending on what engine you have, there may be an electric assist pump or even 2 in the system. On some, they have an electric pump to circulate coolant through heater core at idle to maintain proper heat , as well as another to assist mechanically driven pump when coolant temperature gets to approx 195F. Obviously when going up hills there is an added continuous load on engine, which will cause it to run hotter, thus I would expect that electric pump to be kicking in, and if not, may be the cause. Also the added load of climbing hills, creates added exhaust temperature, and if there is any restrictions, the results would be overheating. Quite often you may feel at least a little lack of power compared to what it used to be, or an increase in fuel consumption, or both when exhaust has a restriction. With that said, a weak water pump is also a possibility. Hope this sheds some light on what to pay attention to.

Mar 06, 2010 | 1997 Cadillac DeVille

2 Answers

My 98 deville over heated tonight I only drove it for about 10 minutes or so it got to 262 degrees. i only had it for a 5 days.


The most common overheating problem with the Northstar engine is a blocked purge line. It's job is to purge air out of the cooling system.
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.

Nov 29, 2009 | 1998 Cadillac DeVille

1 Answer

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.

Aug 13, 2009 | 1996 Cadillac DeVille

1 Answer

Overheating,eveything looks ok.


I have a 97 Cadillac Deville with a northstar engine and have replaced it twice so far, so i answer this by experience...i've noticed to my two prior engines that went bad that the normal temp should NOT EXCEED 228 (normal), the red overheating light will come on at 250 and at 260 it will beep and tell you to stop engine - idle engine and will begin to smoke (overheat).

I hope this helps you and anyone else...by the way if your asking why did i replace my engine twice is simply because my cadillac is super clean inside and out, immaculate condition.

Apr 15, 2009 | 1997 Cadillac DeVille

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