Overheating

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  #1  
Old 01-08-06, 06:59 AM
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Overheating

my van is running to hot, and i cant get to run cooler, the gauge says it on the red, and when i open the hood the outlet hose is to hot to touch. i've replaced the thermostat and done a flush.

This is on my 90 chevy astro
 
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Old 01-08-06, 08:47 AM
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Is it hot even at freeway speeds?
 
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Old 01-08-06, 09:48 AM
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Yes It Will Drop Down to the middle of yellow and red
 
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Old 01-08-06, 10:27 AM
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I thought maybe the cooling fan motor stopped operating. But it still appears hot, even for freeway speeds. I can only think of three things at this point:

- The water pump impeller is worn from erosion (rare)

- The temp gauge or temp sensor may be inaccurate. The outlet hose should be hot to the touch for any car.

- The radiator is coated internally with deposits, reducing thermal transfer efficiency. Have any stop-leak products ever been added to the system? Some radiator shops can rod out the radiator, cleaning out the deposits. It may be just as cheap to replace the radiator.
 
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Old 01-08-06, 11:26 AM
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Fan works fine, its belt driven
water pump is working
the hose is super hot to hot to touch
my mom said when she owned it, she said she had put some of the stop-leak products before the motor blew 7 years ago
 
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Old 01-08-06, 12:06 PM
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Does the temperature decrease at all if you turn your heat inside on high, or have you tried that? If it does decrease, I'd take a real good look at that rad & the condition of the cooling fins etc, especially near the bottom where the rot usually starts. Maybe it's just had the biscuit. Running the heater on full, acts like another mini rad to cool the coolant.
 
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Old 01-08-06, 06:27 PM
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yes with both heaters on it will drop down below yellow, im going to buy a aftermarket rad and see if that fixes the problem
 
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Old 01-10-06, 07:19 PM
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Originally Posted by Mike.B
Does the temperature decrease at all if you turn your heat inside on high, or have you tried that? If it does decrease, I'd take a real good look at that rad & the condition of the cooling fins etc, especially near the bottom where the rot usually starts. Maybe it's just had the biscuit. Running the heater on full, acts like another mini rad to cool the coolant.
I agree with Mr. Mike B. and it is possible that you could have bought a bad thermostat. Might need to replace that too. Possibility. Good Luck.
 
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Old 01-10-06, 07:22 PM
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Originally Posted by kieran
I agree with Mr. Mike B. and it is possible that you could have bought a bad thermostat. Might need to replace that too. Possibility. Good Luck.

i made sure it worked i put it in boiling water and it opened up
 
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