Question about GMC Envoy

1 Answer

2003 GMC Envoy I6 coolant problem and rough idle

Last week I was driving back home when my Envoy decided to overheat I was in the middle of traffic I couldn't get out so I shut down the engine. When I got home there was no antifreeze in the radiator but i did notice that it was in the overflow tank. My thoughts was that the head gasket broke but the oil did not look milky and i forgot to mention that i did not see any puddles of anti freeze any where. So today I changed the thermostat and the water pump I'm still overheating and also now i have a rough idle (I also forgot to mention it did the same thing yesterday when I went to the super market) So heres a list off things I did already: Changed thermostat, changed water pump and flushed the system. take notice that I do not have antifreeze in the motor so I ruled that out but I am smelling gas when its in rough idle though. Can someone help me please :-( Oliver

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • GMC Master
  • 1,061 Answers

Do you have heat coming out of the heater after the thermostat opens? If you do and the truck is still over heating the head gasket could be blown and burning the antifreeze through the cylinders and thus would cause a rough idle. You may want to run a compression test on the truck. Just to be sure your assumption is correct that the head gasket is good. Have you felt the heater hose to make sure it is circulating through the heater and it is not plugged. Hope this helps.

Posted on Mar 14, 2017


6 Suggested Answers


6ya staff

  • 2 Answers


Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017



  • 1 Answer

SOURCE: overheating

It could be your head gasket.

Posted on Feb 12, 2009


  • 34 Answers

SOURCE: 1993 chevy camero- thick, rusty colored residue in radiator

The rust is probably in the engine. There are many little pockets, water ways, water jackets (around the cylinders), etc, so getting all the rust out without dunking the block and heads in a cleaning tank is about imposible. I would recommend giving it really good flush every 4 to 6 months. I would try flushing the radiator before replacing it because it is probably not rusted, even though it is full of gunk.

Posted on May 18, 2009


  • 4088 Answers

SOURCE: replaced cylinder heads and had them pressure

If the replacement heads were not new, they may have been previously warped causing combustion products to leak into the cooling system. Another cause of this problem is improper torquing of the head bolts.There is a fairly simple test that a well-equipped shop can perform to check for such leakage. If the test is positive, then the heads must be removed again, tested for flatness (resurfaced if possible), then reinstalled with fresh gaskets and proper torquing of the bolts. Not the answer that you were looking for. Good luck!

Posted on Jan 04, 2010


  • 1 Answer

SOURCE: My 1995 Riviera is overheating and this has become

I think you might want to have your cam sensor checked

Posted on Jul 21, 2010


Dave C

  • 1050 Answers

SOURCE: My '99 Pontiac Grand Am

I would replace the rad, you've done everything else.

Posted on Jun 02, 2011

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Using oil looking for possible fix on a 2005 envoy denali

GMC Envoy problems and GMC Envoy repair histories -- car repair descriptions reported ... by car, to see how many repairs each car required and where the car is located. ... 5.3L V8; 2006 291-horsepower 4.2L I6; 2005 275-horsepower 4.2L I6; 2004 ... Advised by OnStar not to drive and have it towed. ----------------------------------------------
galletto 1260

Dec 20, 2012 | 2005 GMC Envoy Denali

2 Answers

Where is the starter on my 2003 gmc envoy xl located

It will be on the bell housing gear box area.

Nov 11, 2012 | 2003 GMC Envoy

1 Answer

2003 envoy smells like fumes and idles rough

have you checked for a vacuum leak?pcv attached,no leaks around plenum,engine coolant temp sensor reading right.

May 31, 2012 | 2003 GMC Envoy Xl

2 Answers

2003 gmc envoy!!! Need help asap! For the last

Ask a garage to reset your computer, could be a recurring trip fault causing the car to shut down.

Clearing it might solve the problem - if not, the fault codes will tell you what the problem is!

Apr 30, 2010 | 2003 GMC Envoy

1 Answer

GMC Envoy 2002. When I get to traffic stop light. It will stall .. RPM is about 500 at idle. Doesn't do it when cold ( idle around 1000RPM. runs ok when driving just stalls when you get to stop sign or...

check your vaucumn hoses for leaks any leak in that system will effect your fuel pressure regulator and fuel rail that controls the running ability

Jan 14, 2010 | 2002 GMC Envoy

2 Answers

Rough idle

sound slike you may have unplugged or disconnected somethine else or the spark plug you put in is bad or inpropper gap

Sep 03, 2009 | 2002 GMC Envoy

1 Answer

I have a 2002 GMC Envoy XL, 4X4 automatic. When driving home last week I merged into traffic and when the transmission up-shifted it slipped. I let up on the gas and it hooked up and I was able to get...

Check ur fluid--is it burnt or have a bad smell? You might only need a trans service which is changing the fluid and filter, in the process the tech will tell u if there are any filings in the pan, if so u will need an overhaul, if not the service might fix u up--good luck

Jul 07, 2009 | 2003 GMC Envoy Xl

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

88 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts


Level 3 Expert

85206 Answers

Jonah Oneal

Level 3 Expert

14092 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22484 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides