Question about 2001 Chevrolet Venture

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I repaired water pump,thermastat, and temp. coolant sensor and still engine run hot

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Sounds as though u may have a base engine problem ie: head gasket, as long as you are sure u bled all the air out of the cooling system using the 2 bleeder screws.

Posted on May 06, 2010

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Posted on Jan 02, 2017

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My truck runs fine for about 15 miles. when it is hot outside the temp starts to rise....has a new water pump on it,new coolant....how can i tell if the fan clutch is bad?


Have you checked the thermastat too because this part also goes bad and does not open up at its temperature range to allows the coolant to go through the engine to cool it off. Usually when the fan comes on is at a much higher engine temperature so you would have to run the truck just by having it idle for 5 or 10 minutes so the engine gets hot and you should see if the fans come on to help cool the engine down to its normal temps.

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The heater only blows cold air,the radiator is full,thermastat is working and the engine temp is within normal ranges.


I've had this problem. 2000 GMC uses a closed coolant system. Meaning takes and returns coolant from and to the Reserve Bottle and has little air in the engine and heater systems.
If everything appears ok but no heat. "Air Lock" is the most likely cause. (With interior heater set to full heat) Solution; 1. Make sure water pump works. 2. Drain about 1/2 engine coolant into container. 3 Remove both heater hoses from engine side and flush heater core in both directs through heater hoses with garden hose. 4. Reattach heater hoses in correct locations. 4. Refill engine with coolant. 5 Start engine and run for 2 min., use caution when topping up coolant.
6. Most 2000 GMC have twist off caps with plugs located mid way on heater hoses. with engine cold, start engine these caps may be loosened to allow trapped air to escape. Do not attempt with engine hot due to hot coolant injuries. This may take more than one attempt to remove all air from heat system. 7. Lastly most 2000 GMC water pumps have a bleeder plug,( 3/8" square driver plug) located on the water pump. With egine cold this plug should be removed to remove any air. Reinstall plug with thread sealant.
Hope this helps cheers

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I have a 2003 chevy impala. just changed the thermastat because the temperature was fluxuating. Since changing the thermastat the temperature gage constantly read in the red, however the coolant level...


You probably need to bleed the cooling system properly.

Open the cooling system bleeder screws.

Slowly fill the cooling system with a 50/50 coolant mixture until coolant runs freely out of bleeder screws.
Close the cooling system bleeder screws
Install the coolant pressure cap
Start the engine.
Run the engine at 2,000 - 2,500 RPM until the engine reaches normal operating temperature. (midway on gauge)
Allow the engine to idle for 3 minutes.
Shut the engine off.
Allow the engine to completely cool.
Top off the coolant as necessary.
Run engine again at 2000 - 2500 RPM until the engine reaches normal operating temperature.
Allow engine to idle until cooling fans come on. It should come on with the gauge about 3/4 of the way to red. - if it gets to where is touches the red, shut down immediately.
When the fan comes on, put your hand behind the fan and observe the temperature of the air coming from the fan. It should feel hot. If it is blowing cold air, the coolant is not circulating through the radiator like it should. This could be caused by lots of things including an improper/defective thermostat, corroded water pump impeller, or a blown head gasket.

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Is the temp guage reading high or are you just suspecting it needs to cool down? Could be thermastat bad or possible water temp sensor bad. Maybe water pump. After next time you run the car for awhile carefully touch the radiator cap and should be hot, if not then coolant is not circulating.

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