Question about 2004 GMC Sierra 2500

1 Answer

Overheating I own a GMC 2004 2500 and it keeps on over heating. I have in the shop right now but the GM Dealership cannot find anything wrong with it. They have did the pressure test no leaks thermostat is working fine they have even check the back pressure on the exhaust to make sure the catalyst converts are not plugged and still no where. Anyone have any ideas.

Posted by on

  • lesedwards Jun 24, 2008

    Yes as far as I know they said the fan was kicking in and out as it needed to and they cannot find any leaks in the water pump.

  • ggillingham Feb 02, 2009

    Ours is a 2005. Just replaced the thermostat but still hot. Not blowing hot air inside the truck, so apparently the water is not getting into the engine. When I replaced the thermostat I replaced the radiator cap after filling the reservoir as full as I could, then found out it should have been left off during filling.



1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 702 Answers

Have they checked to see if the clutch fan is working properly and water pump?

Posted on Jun 24, 2008

  • Lee Quiroz
    Lee Quiroz Jun 24, 2008

    The shop you have your truck at should make sure that when the truck is at operating temp. that both the upper and lower radiator hoses are close to the same temp. this will tell them if the water pump is doing it's job circulating the water. The water pump doesn't have to leak to be improperly working. A radiator cap being worn out will cause the later model cars to have an overheating problem as well. The cooling system cannot pressurized the way it should if the cap is bad.



1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that 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.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


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



Related Questions:

1 Answer

2011 gmc canyon crew 5 cylinder with 20,000 miles on it. Living in philadelphia. Dealership can't find anything wrong because there are no codes coming up but truck has bad idle in park and in

check the boggie cords (the cables that run from distributor to the spark plugs some times they arent pushed on properly or they deteriorate from heat of the engine

Nov 27, 2014 | GMC Cars & Trucks

1 Answer

How to troubleshoot the electrical air conditioning system 2000 GMC Yukon Denali. I put in new resistor, relay and dealer blower motor and it still doesn't do anything. Air conditioning control switch...

The compressor on the air conditioner in my 2000 GMC Yukon XL went out last summer. Had it and the whole line replaced at a local air conditioning shop last fall. Used it little before cold weather. Warm weather this spring and no cold air. We could hear the compressor trying to kick in. The shop told us that the control console was bad and had to be replaced. They told us the part was on back order and did not know if they would be abel to get one any time soon. We took the Yukon into the local GM dealership. They told us that the high side fitting was bad and that the freon was very low and that they would have to deal with that first to check the system. Called back to the air conditioning shop and they said they had a console come in and they would put it in and check the high side fitting. I now have cold air and questions. Bought Yukon in 2005 used, had always had problem of not switching to cold air once the heater has been used. We were told changing the console should fix that. It has not changed. I feel like the console angle was a scam, that the system was just low on freon. Each shop was blaming the other for trying to scam me. And what can fix the heat to cold issue? If anyone has answers I would sure appreciate the knowledge.

Jul 02, 2010 | 2000 GMC Yukon Denali

1 Answer

2004 GMC Envoy check engine light remains illuminated. Diagnostics revealed codes: P1133 and P0128. P1133 points to a heated oxygen sensor and P0128 indicates a possible defective thermostat. The O2 sensor...

Leave 02 sensor alone ,it is doing it's job . It is heated up because of lean fuel mixture due to incorrect engine temp.,replace thermostat before looking further.

Jan 20, 2010 | 2004 GMC Envoy

1 Answer

Wher is the stat located for heating system on a GMC 2000 pu 5.3 engine

for the most part its under the upper radiator hose close to the engine give these websites a try and if all fails stop by your local GM dealership in the parts department and they be able to print you off the pictures and diagrams you will need wish you the best of luck Michigan Man.

Jan 13, 2010 | 2000 GMC Sierra

2 Answers

I need to know ware the oil filter is on a 2002 gmc sonoma on v6

for the most part you are under the truck and see the oil pan the filter should be close give these websites a try and if all fails stop by your local GM-dealership in the parts department and they will print you off the pictures and digarams you need wish you the best of luck Michigan Man.

Jan 02, 2010 | 2002 GMC Sonoma Extended Cab

1 Answer

Driver side heated seat does not heat up when pushing the "on" button it lights up butshuts off imediately and the seat does not heat up. C

I had the same problem with my 03 Sierra. Took it to the GM dealership and they diagnosed it as shorted-out heater elements in the seat (bottom and back). Brace yourself - they're expensive to fix. Dealer wanted just over $900 USD and wouldn't guarantee the work. Even charged me $80 to diagnose the problem. Here's some good news - the elements are available online @ at about 1/3 the price from the dealership. If you can't install them yourself (it takes some upholstery know-how), contact a local auto upholstery shop and they should be able to intall them for you for around $100-$150.

Good Luck!

Oct 20, 2009 | 2003 GMC Sierra 1500

1 Answer

Poor Braking power- new cylinder-new lines new ABS module -bled

i have ran into this problem , but on earlier gm products---check the local dealership or a well known mechanic shop that has all data and check for bullitains. what i had found out was there was some trucks that gm had installed the wrong power booster . not saying your booster is to blame, but may be a great place to look seeing you replaced abs modules ,master cylinder ect---hope that helped out!!

Jul 08, 2009 | 1999 GMC Sierra

1 Answer

Any one know of any common problems?

I am a GM mechanic at a dealership in Texas. I don't see much in the way of problems with this truck. If it has a 4.3 V6 then you have a good engine. The only real problem is intake gaskets leaking coolant. Keep the radiator flushed, and do the regular maintenance and it will serve you well. Good Luck

May 20, 2009 | 1998 GMC Sonoma

1 Answer

Heated seats not working.

Work for a GM dealership. the problem is the heated seat pad element is bad. Replacing the element is not easy but can be done at home.

Jan 29, 2009 | 2004 GMC Envoy

1 Answer

Engine Light on. Dealership says fan clutch is Slipping

Work for GM dealership.The fan can be replaced anytime and a pcm reflash can also be done anytime.If the service engine soon lamp is on because of cooling fan code it is broke!!!!! As far as the price sounds about right

Jan 28, 2009 | 2002 GMC Envoy

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

Related Topics:

119 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts


Level 3 Expert

76848 Answers


Level 3 Expert

1311 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22246 Answers

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

Answer questions

Manuals & User Guides