overheating problem overheating hummer engines 2004 h2

Q: overheating problem

asked by on August 08, 2016

I own a Hummer H2 and it continues to overheat. I have replaced the thermostat, the water pump and the heads. But I still am having the overheating problem. What could this be caused from? Do you have any answers?

Thanks for writing in about your Hummer H2. Let’s cover the basics of diagnosing a overheating issue. First, verify the actual temperature at the thermostat housing. Cooling system (and cap) has probably been pressure tested by now. If it tends to overheat in stop-and-go traffic, but not at cruising speeds, then it’s an airflow issue.

Check the fan clutch, shrouds in place, and look for debris blocking the condenser/radiator. I don’t know your mileage, but both the belt and tensioner should have been replaced by this time. If it is overheating at cruising speed, the radiator should be checked for restriction in flow. Have this checked in person by a trained mechanic in order to diagnose the overheating issue and move forward with repairs.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

How to clear P0443 code?

The purge valve connector should have power from the main relay terminal C on one of the pins of the purge valve with the key on. The other wire goes to the pin 18 of the ECM. If you have...

My car is skipping.

Hello. This can be caused by a number of things. It can be anything from a faulty sensor to a tune-up issue. I usually check the computer for codes and check all of the sensor readings with a scan tool....

Power Steering Pulley Removal

You should check to see if the special power steering tool looks like this kit. You will need this to remove and install the pulley. This kit is normal for Ford pulley removal and installer.

Related articles

How Long Does a Crankshaft Position Sensor Last?
The The crankshaft position sensor monitors the rotational speed and position of the crankshaft in the engine. It reports this information to the engine management system to control the ignition system timing. The crankshaft position sensor is used with the...
How Long Does a Thermostat Last?
No No matter what kind of car or truck you drive, it has a thermostat in it. This thermostat is responsible for monitoring and regulating the coolant temperature in your vehicle's engine. If you were to look at the thermostat...
How Long Does an Exhaust Gas Recirculation (EGR) Tube Last?
The The exhaust gas recirculation (EGR) tube is part of your vehicle's EGR (exhaust gas recirculation) system and is part of the EGR valve. The EGR valve works to recirculate the exhaust gas your car produces so that you aren't...