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Overheating after shop replaced water pump, thermostat, heat sensor, hose

Tiny
RLBRANNON7
  • MEMBER
  • 2001 CHEVROLET VENTURE
  • V6
  • 2WD
  • AUTOMATIC
  • 128,000 MILES
I got it out drove 7 miles, began to overheat. Took back to shop they said fan only comes on low, not high. They said wiring problem, need PCM, and they do not do that.
Monday, December 9th, 2019 AT 12:51 PM

6 Replies

Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello,

Okay, so let's work through this circuit together. First off in the diagrams down below I have included a wiring diagram of your vehicle's cooling fan circuit for your reference. I have also included the diagram with call out for your vehicle's Under hood Fuse Box. Can you please check the Cooling Fan 2 fuse in the Under hood Fuse Box for us. Here is a link down below explaining how to check a fuse, if needed:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Please get back to us with what you find out and we can go from there.

Thanks,
Alex
2CarPros
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Monday, December 9th, 2019 AT 3:24 PM
Tiny
RLBRANNON7
  • MEMBER
  • 4 POSTS
Thank you for providing information. I will try to explain what I have been told by shop. I just looked at cool fan 2 fuse. It is 30 amp and appears to be new. They told me they replaced a dirty fuse. I have been told only low fan is coming on. When I first picked up van after repairs. I drove around town fine for a few hours. Next day when I got on highway at 65 mph only got 5-6 miles, gauge went all the way to red zone. I pulled over, waited for engine to cool. Went 2-3 miles pulled over, repeated until made it back to shop. Next thing I was told they were replacing heat sensor. I have attached picture of new sensor they told me goes to gauge in dash.
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Tuesday, December 10th, 2019 AT 10:01 AM
Tiny
RLBRANNON7
  • MEMBER
  • 4 POSTS
Neighbor suggested to start vehicle, let run until warms up, to see if bubbles in coolant overflow tank because of possible bad head gasket. Overflow was empty. I added 3/4 gallon antifreeze. Started motor. It took about 30 minutes to heat up. As soon as gauge reached between 1/2 and 3/4, both fans kicked on, and gauge went down to 1/2. Did not see any bubbles in overflow while motor running. Neighbor suggests Bars Leaks Block Seal Intake and Radiator Stop Lock because of possible intake manifold gasket.
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Tuesday, December 10th, 2019 AT 12:02 PM
Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello,

If you are worried that you might have a blown head gasket there are a couple of different tests that you can do to either confirm or deny this. The first is a compression test and here is a link to a guide explaining how to do it below:

https://www.2carpros.com/articles/how-to-test-engine-compression

The second is a head gasket test that can be picked up at any auto parts store. Here is a link explaining how to do this test below:

https://www.2carpros.com/articles/head-gasket-blown-test

As far as adding a sealant into the radiator to seal a head gasket I don't recommend doing it, but if you are going to the only product I would recommend is Blue Devil, which I have personally seen work before. Make sure that you follow the directions on the bottle to a "T". Please get back to us with how everything turns out.

Thanks,
Alex
2CarPros
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Tuesday, December 10th, 2019 AT 8:00 PM
Tiny
RLBRANNON7
  • MEMBER
  • 4 POSTS
I don't feel good about the doing the gasket test myself. Is there a test I can do to check why the fans are only on low speed and not high speed?
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Wednesday, December 11th, 2019 AT 7:24 AM
Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello again,

Sure, we can run down that problem. You will need to use a Digital Multi-meter [DMM] to run down the problem, so, here is a link to a guide explaining how to use one, if needed, below:

https://www.2carpros.com/articles/how-to-use-a-voltmeter

In the diagrams down below I have included the wiring diagram for your vehicle's radiator cooling fans circuit, and the location and layout diagram with call out for the Under hood Junction Block for your vehicle. Please check the Cool Fan 2 relay in the Under hood Junction Block for us. Here is a link below explaining how to test relays, if needed:

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Please get back to us with what you find out and we can go from there.

Thanks,
Alex
2CarPros
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Wednesday, December 11th, 2019 AT 7:48 AM

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