Question about 2003 Hummer H2

2 Answers

Overheating I have tried doing a radiator flush and have refilled the radiator again and thought that solved the problem but it is still overheating. I read somewhere that I may need to replace the hoses if they show signs of collapse but I don't see any of the hoses collapsing... I may need to look harder... But, how can I test if it is the waterpump or the thermostat?

Posted by on


2 Answers

  • 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.


    An expert who has achieved Level 3.

  • Master
  • 426 Answers

If the thermostat doesnt open hoses can **** in on them selfs Watch hoses while at operating temperature and rev the vehicle while watching the radiator hoses,top and bottom,to see if they stay normal.The bottom hose usualy has a steel inner winding to stop water pump from sucking hose in but have seen these corrode and collapse.I think you should replace the thermostat first and check that the fans are cooling the radiator correctly.Also check the accuracy of the water sensor that sends the signal to your dash gauge to make sure its not a simple sensor fault.Generaly a water pump will not give problems until it starts to leak.Have you bled the water system as air locks can cause your problem as well.good luck

Posted on Oct 23, 2008


Thank you for the post... I will look at my hoses closer to make sure they are not collapsing.  It can't be a sensor cause I have noticed that when it overheats and I wait for it to cool when I ad water it takes in a lot of water.

Posted on Oct 23, 2008


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.
Good luck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


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



Related Questions:

2 Answers

Recently had a new water pump fitted to my jeep Cherokee but it's still overheating and the heater in the car doesn't work. Any idea what might be causing this

if no leaks in hoses, then flush out the radiator etc, there maybe a plug up in system. also change thermostat. God-Bless! and hope this helps you.

Apr 24, 2016 | Jeep Cars & Trucks

1 Answer

How do I flush the radiator in a 1987 mercury sable

If you want to solve your problem, click on the link I attached mercury

Nov 14, 2017 | Cars & Trucks

1 Answer

I've a problem with aDodge Caravan 98 4cyl. the engine is overheating cause the ecm read an incorrect temperature from the ect, the ecm was replaced and the ect too and the problem still there, with the...

This could only be a couple of things. I would recommend that you replace the thermostat, and flush the radiator. If the issue persist, then you may need a new radiator. Make sure that you use a 50/50 blend of antifreeze and water when you refill. When you flush the radiator, use some Prestone radiator flush, and follow the directions on the bottle.

Mar 18, 2011 | 1995 Dodge Caravan

1 Answer

My car is overheating. I just replaced thermostat and recently replaced the water pump. I checked for water leaking but dont see any. What could it possibly be

If the thermostat and pump have been replaced, it's most likely the radiator. They corrode after time. Try flushing the antifreeze (not just draining and refilling it, but flush the system with clear water.) Most auto stores, Walmart, etc. carry the flush kit for very little $$. Once it's flushed, refill the system with the correct ratio of antifreeze.

If the problem persists, then it's most likely gunk in the radiator. Auto shops can boil them clean.

Short of all of the above, overheating can also be caused by a cracked cylinder head. If it overheated too bad at any point, it can crack the head and will continue to overheat regularly. Check for antifreeze in the oil. If there "is" antifreeze or water in the oil, the head is most likely shot (and yes, it will still run that way).

Jan 25, 2010 | 1987 Cadillac Brougham

2 Answers

Trans fluid getting into rad causing overheating

The only way it can get in the rad is internally.You need to replace the radiater or take to a rad shop to see if can be recored.

Oct 19, 2009 | 1989 Mazda 323

2 Answers


remove radiator and power wash fins they could be blocked then install again then get a good engine flush drain water then refill with flush and water then start and drive read the flush bottle for instructions then let all out again then refil with clean water and a good coolant , remember to blead the system when filling every time you drain water etc, hope this helps. it will work.

Aug 24, 2009 | 1992 Cadillac Seville

1 Answer

96 Blazer Overheating

Yes the issue is most likely an air block, jack the front of the truck up as far as you can, fill the recovery bottle and run the engine for about 10 min, then shut down and run cold water over the radiator, this should purge the air, recheck the recovery tank and refill as ness.

Oct 30, 2008 | 1996 Chevrolet Blazer

1 Answer

1988 jeep wrangler

If you are trying to solve an overheating problem this will not achieve anything, but if just to clean out dirty coolant this is how its done..
When engine is cold !!! with radiator in vehicle.
1/ Remove Top and bottom radiator hoses.
2/ Insert garden hose into bottom hose connection of radiator (Use a rag to help seal the connection) turn on water fully to reverse flush radiator till water comes out of top connection, repeat a couple of times.
3/ Reconnect hose to radiator , fill with clean water only.
4/ Run engine till it reaches normal temperature, then switch off engine and allow to cool.
5/ Remove bottom hose to drain system again, refit hose and refill with a good coolant mixture according to you climate.

Aug 05, 2008 | 1988 Jeep Wrangler

Not finding what you are looking for?
2003 Hummer H2 Logo

410 people viewed this question

Ask a Question

Usually answered in minutes!

Top Hummer Experts


Level 3 Expert

77947 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22306 Answers

Brandon Johnson
Brandon Johnson

Level 2 Expert

251 Answers

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

Answer questions

Manuals & User Guides