OVERHEATING PROBLEMS

  • Tiny
  • csvial
  • 2001 Chevrolet Venture
  • 6 CYL
  • FWD
  • automatic
  • 150,000 miles

I have a 2001 Chevy Venture MiniVan that started overheating suddenly. I replaced the thermostat, and now the coolant temp. Sensor/sender. The fans do kick on but it seems later than it should. Still overheating and out of ideas, please help! Thanks

Sunday, July 3rd, 2011 AT 2:03 AM

10 Answers

  • Tiny
  • saturntech9
  • Expert
  • 28,436 posts

What temp do the fans come on actual temp not what the gauge might be reading incorrectly. Best way to check it would be to use a temp gun where the upper hose hooks to the engine.

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Sunday, July 3rd, 2011 AT 2:11 AM
  • Tiny
  • csvial
  • Member

Fans kick on at about 160

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Sunday, July 3rd, 2011 AT 2:12 AM
  • Tiny
  • saturntech9
  • Expert
  • 28,436 posts

Thats too cold did you use a temp to get this temp?They usually come on at 222-226 degrees.

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Sunday, July 3rd, 2011 AT 2:17 AM
  • Tiny
  • csvial
  • Member

Yes, took the temp on the cap, not sure why it is so much cooler, the temp on the line is 230, this time when it kicked in. It's got me confused the outlet at the thermostat is 230 but the inlet to the pump is only 200, yet the gauge still keeps climbing.

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Sunday, July 3rd, 2011 AT 2:23 AM
  • Tiny
  • saturntech9
  • Expert
  • 28,436 posts

When it gets that hot measure the temp of the upper and lower radiator hoses. Sounds like your thermostat might not be working correctly.

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Sunday, July 3rd, 2011 AT 2:49 AM
  • Tiny
  • csvial
  • Member

K, this time was 270 on the upper and 230 on the lower. The thermostat is about 1 day old, and was the worst to replace I have ever seen I hope that it's not bad already.

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Sunday, July 3rd, 2011 AT 2:55 AM
  • Tiny
  • saturntech9
  • Expert
  • 28,436 posts

Sounds like the thermostat is working are both fans running on high when its that temp?Also have you made sure the cooling fins of the radiator arent clogged with sand fur debris etc causing not enough air to be pulled thru the radiator?

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Sunday, July 3rd, 2011 AT 3:15 AM
  • Tiny
  • csvial
  • Member

Fins are clear, fans are on high. Have re-bled about 5 times, have now resorted to just draining the whole system and flushing to make sure there are no clogs. I've never had such a headache from a cooling system before.

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Sunday, July 3rd, 2011 AT 3:03 PM
  • Tiny
  • cadieman
  • Member

Sounds like the radiator is restricked internaly. How is the flow through the inner radiator tubes?

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Sunday, July 3rd, 2011 AT 7:09 PM
  • Tiny
  • saturntech9
  • Expert
  • 28,436 posts

When you get it all back together and running up to temp use your temp gun to make sure the radiator is equal temp all the way across it. After you know the coolant is flowing thru the radiator.

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Sunday, July 3rd, 2011 AT 7:47 PM

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