2001 Chevy Astro running hot

Tiny
BROTHERMIKE
  • MEMBER
  • 2001 CHEVROLET ASTRO
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 110,000 MILES
Still running Hot after putting in a new Thermostato, took off water pump it is still good, took off radiator and washed out very good apears to be open. The motor will run hot in a half of mile from o to 260 before I reach a half a mile away. Another question is; there is a little round thing that looks like a small motor that is bolted to the block right beside the thermostate thats wires plugged into into it. Would like to know what it is and for. Thanks for any ideas and for real answers.
Sunday, August 23rd, 2009 AT 5:58 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
Is there a chance you could take a picture and up load it for me?

As far as the overheating, have you had to add coolant to the engine? Also, make sure the catylatic converter isn't plugging.
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Thursday, September 3rd, 2009 AT 7:29 AM
Tiny
BROTHERMIKE
  • MEMBER
  • 6 POSTS
I have ever so offten, the radiator has been real gunky for the last year, washed it out last year with the cleaning kit but still stayes gunky. I took out the thermostat and run the van without it and I ran it about 5 miles and the temp stayed about 190 all the way. Then I put in a new thermostat and run it, it run hot in about a mile. Do you think the radiator is could be stop up. I took it off and washed it out just with the water hose it apeared to be open, but I guess it could be half stopped up. Don't want to buy a $200 radiator just to try that. Thanks
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Friday, September 4th, 2009 AT 12:03 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
It could be the radiator, but I understand what you are saying. If there is a radiator shop near you, I would recommend taking it there and having them "Rod" it out. Where I live, there is a shop that charges around 30.00 to do it. They first boil it on an acidic liquid. Then rod it out, paint it, pressure test it and check it for flow. They know if it is good or bad. I have had it done several times over the years and when I got them back, they were like new. You may want to check for a radiator shop and ask if they do that type of work.
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Friday, September 4th, 2009 AT 1:06 PM

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