Question about 2003 GMC Envoy

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I just replaced thermostat good on anti freeze still running hot

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Hows the water flow through the radiator? maybe there are some plugged tubes in it. The impellers on the water pump may have eroded down so the volume of water the pump circulates isn't enough. Look in the radiator with the cap off and the engine running. If bubbles are present one of the heads is warped allowing compression gases from a cylinder to enter the radiator.

Posted on Jul 24, 2016

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2 Answers

Replaced thermostat in 2001 dodgecaravan - heat stays on 2 minutes & then turns cold


you may have a air pocket and it needs to be bleed. check and see if both heater core hoses are getting hot

Dec 07, 2012 | 2001 Dodge Grand Caravan

1 Answer

Gets hot when idle got fan hooked up to a toggle switch


have you replaced the thermostat if not do so. it needs to be replaced at least every 3 years and change the anti-freeze every time the anti-freeze manufacturer requires. Also never run a car without a thermostat. Your thermostat may be stuck open or even closed. Never run just plain water as a coolant.

Jul 23, 2012 | 2003 Jeep Grand Cherokee

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Why is my car running hot and I replaced the thermostat


check the anti freeze bottle in engine comp. mine had a crack and made mine run hot

Jul 03, 2012 | 2000 Oldsmobile Intrigue

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The van wont get hot i have anti freeze in it


It sounds like your thermostat is stuck open. Replace it and that should remedy the issue. Make sure that you are using a 50/50 mixture on the anti-freeze. Water is the catalyst that makes anti-freeze work.

Nov 18, 2011 | 2001 Dodge Grand Caravan

1 Answer

Car is running hot had a recent radiator change, the top and bottom hoses are very hard and hot ! could this be the thermostat stuck closed?


Check your coolant level. It may be low.
Did they put the proper mixture of anti-freeze back in? I would have the anti-freeze checked. Or you can buy a simple little tool for a few bucks and do it yourself.

A radiator hose is supposed to be "hard" to withstand the heat. If hoses become soft it is time to replace them.

I don't know enough about Mercedes to answer your question much further other than to suggest the thermostat. If they put in a new radiator, they should have suggested putting in a new thermostat also, but they don't always do that.

Check your anti-freeze mixture first.

Simple things first.

Feb 14, 2011 | 1998 Mercedes-Benz M-Class

1 Answer

I drained the cooling system and refilled with antifreeze. Now it runs hot. I know the water pump and thermostat are ok


If you filled it with straight anti-freeze, it will run hot. Anti-freeze needs to be diluted with water to work properly. Use the guidelines on the jug to figure the proper mixture for your area. If unsure, usually 50-50 is a good mix (but I live in the SE US). I was guilty of the straight anti-freeze usage in the '80's and was told I had to mix it...and when I did, everything worked properly.
Hope this helps...if you didn't use straight antifreeze, then this is of no help :)

Jan 30, 2011 | Toyota Previa Cars & Trucks

2 Answers

I have had my radiator replaced twice because my car started running hot. Now if my car idles too long the temp will go to hot. I have added more anti-freeze to the radiator but I never see anything...


possibly a blown head gasket. Take off the radiator cap and run the engine--are there any bubbles coming up in the coolant? Check the exhaust pipe--is it steamy or does it smell like anti-freeze?

Oct 03, 2010 | 2004 Hyundai Elantra

2 Answers

Car idols rough and has started over heating had auto zone pull codes and they said it is the fan. needles to say we replaced that and the problem did go away. had a/c relay switch replaces 4 months ago....


a/c relay has to do with a/c compressor. Do you have a/c? If so it's not that. You could have a bad thermostat. Have you replaced one yet? That would cause the over heating. The rough idel I'm not sure what to tell you there. Sorry.

Aug 12, 2010 | 2004 Chevrolet TrailBlazer

1 Answer

Walk through on how to replace a thermostat in a 2001 Jeep grand Cherokee


Jennipherbrr,

1. Make sure the car is cold. Remove the radiator cap (press & turn about 1/4 turn to remove pressure in the system) Once the pressure is bled off you can remove cap and leave it rest on the filler opening.

2. Find the petcock on the radiator (the little valve attached to the radiator. You have to open/turn clockwise to drain the anti-freeze. Drain anti freeze below thermostat housing. About 1/2 to 1 gallon.

3. Have a catch basin for the anti freeze under the car. Remove upper radiator hose from radiator and thermostat housing.

4. Remove thermostat housing from engine block (usually two or three bolts in the thermostat housing). Scrap off ALL old gasket material from engine block. Double check and make sure all gasket material is removed from surface. If not the thermostat housing will leak.

5. Install new gasket with some high temp silicone. Place a couple of dabs on the thermostat housing and gasket (the silicone is used to keep the gasket in place) *MAKE SURE YOU INSTALL the thermostat the same way you took it out. Don't over tighten the thermostat housing bolts.

6. Remove the radiator cap and replace the anti freeze you removed (make sure the anti freeze is clean). Fill the radiator to the top of the filler neck and replace the radiator cap (push and turn the radiator cap to the right- like a pill bottle). Start the car and make sure the temperture guage goes up. The guage pointer should be in the middle of the guage.

7. Check the radiator reservoir for proper anti freeze level. DO NOT OPEN THE RADIATOR CAP WHEN THE CAR IS HOT!!! THE ANTI FREEZE IS HOT AND WILL BURN YOU.

Hope this helps

Apr 19, 2010 | 2001 Jeep Grand Cherokee

1 Answer

My 2003 Subaru Baja runs hot sometimes. I have


Check your thermostat is working properly and maybe even flush and replace coolant. Good luck and have a great day.

Jul 11, 2009 | 2003 Subaru Baja

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