1987 L98 TPI // Overheating ? aux coolant tanks boils !!!!! - Hot Rod Forum : Hotrodders Bulletin Board
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Old 10-19-2008, 12:18 AM
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1987 L98 TPI // Overheating ? aux coolant tanks boils !!!!!

im sick of that problem.-
on the gauge,it never overheats,always the operating temperature is OK
but when i stop it and park the car,after 30 seconds the coolant reservoir tank starts to boil and boil.
Why is that happening ? i was told i have to burp the system.
i have the radiator drained,inspected and cleaned,coolant added,new cap.-
Problems stay.-
what you think ?

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Old 10-19-2008, 01:09 AM
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Quote:
Originally Posted by Calderone
im sick of that problem.-
on the gauge,it never overheats,always the operating temperature is OK
but when i stop it and park the car,after 30 seconds the coolant reservoir tank starts to boil and boil.
Why is that happening ? i was told i have to burp the system.
i have the radiator drained,inspected and cleaned,coolant added,new cap.-
Problems stay.-
what you think ?
My 2 cents worth!
The fan clutch. The fan clutch equates to a 'lack of air flow' across and through the radiator.

You also need to make sure you have a fan shroud installed. Factory shroud or not.

Last edited by carsavvycook; 10-19-2008 at 01:19 AM. Reason: Forgot Fan Shroud
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Old 10-19-2008, 03:49 AM
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Before I get technical, I have to ask, is the air dam still under the car?
I used to have a 79 malibu, the air dam came up missing and after that, it would do just as yours is doing, it never ran hot, but it got borderline.
Next, if everything else, fan, water pump, etc. are all working correctly then do this. Drain some coolant out with the engine off. Drain it so it`s about 1/4 way down from the top. Reinstall the radiator cap. Then fill the overflow to the full cold mark, start the car and let it idle, when the car starts to get up to temp you`ll notice air coming out of the system and into overflow, you`ll also notice the overflow`s water level starting to go down. Refill overflow again only this time to the full hot level, add coolant as needed to keep it at the full hot level until it needs no more. test drive and see if the problem persists. Believe it or not, this is how the GM manual says to fill the car. However sometimes when they puke as yours is doing it means the radiator cap spring has gotten weak but being you`ve replaced the cap, then it could just be the system is in fact taking in air someplace and is burping it back out. I seen some vehicles do it forever.
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Old 10-19-2008, 07:26 AM
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Good eye
the air dam is missing,i need to fix that!
thanks,i will do the overflow procedure as well
what caughts my attention is that the gauge temp its always ok
max 110C,sometimes it goes to 112 but no more than that ..never
but i stop it...and boils ! i hate that
thanks !
ps: why it boils after i stop it ?
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