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94 Astro van cooling system

Tiny
JLG
  • MEMBER
  • 1994 ALL OTHER MAKES ALL OTHER MODELS
Engine is 4.3 Z series, I have replaced the thermostat, water pump, hoses. When the thermostat opens, the cooling system doesn't circulate. The van keeps overheating, before the problem, it ran 200 degrees PSI was 40, there's no water in the oil and no gas in the oil. Still running hot, because it won't circulate. I've removed the top hose to let the air out and it still is overheating.

Can anyone give me any other suggestions to help me out?
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Saturday, March 3rd, 2007 AT 11:45 AM

4 Replies

Tiny
BOOTDOG
  • MECHANIC
  • 665 POSTS
I would suspect the blades on the water pump have corroded away not allowing the the pump to do its job. I would look there next.
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Saturday, March 3rd, 2007 AT 5:11 PM
Tiny
JLG
  • MEMBER
  • 2 POSTS
I've replaced the water pump already, so that can't be it. Any other suggestions before I take it to a shop?
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Sunday, March 4th, 2007 AT 7:00 PM
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Plugged radiator
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Monday, March 5th, 2007 AT 7:20 AM
Tiny
ME/US
  • MEMBER
  • 7 POSTS
The way to rule out the radiator is to feel the top fins and compare their temp to the lower fins. After it gets operating temp, they should be very close to equal. If it's clogged the upper fins will be a lot cooler. I hope this helps others too.
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Sunday, April 8th, 2007 AT 10:48 PM

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