'97 Coolant recovery question

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mhorowit@cox.net - 04 Apr 2006 13:11 GMT

When the engine is hot, excess coolant transfers to the coolant
recovery tank.
When the engine cools (overnight), the coolant does not return to the
radiator.
When I remove the radiator cap, I can tell I'm breaking a vacuum.
Is this a radiator cap problem? - Mike

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Jim Warman - 05 Apr 2006 01:36 GMT

It is a possibility... could also be a restriction in the hose to the
recovery tank...

> When the engine is hot, excess coolant transfers to the coolant
> recovery tank.
> When the engine cools (overnight), the coolant does not return to the
> radiator.
> When I remove the radiator cap, I can tell I'm breaking a vacuum.
> Is this a radiator cap problem? - Mike

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mhorowit@cox.net - 04 May 2006 14:48 GMT

Well, beside hearing the vacuum when I release the cap, the upper
radiator hose has collapsed from the vacuum. Thinking it was weak I
replaced it (along with the radiator cap), but the symptom continues.

I removed the small line from the radiator filler neck to the recovery
tank and the vacuum remained in the radiator.

Open to suggestions - Mike

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redman28 - 06 May 2006 00:40 GMT

>When the engine is hot, excess coolant transfers to the coolant
>recovery tank.
>When the engine cools (overnight), the coolant does not return to the
>radiator.
>When I remove the radiator cap, I can tell I'm breaking a vacuum.
>Is this a radiator cap problem? - Mike

The best thing to do is to replace the thermostate plain and simple.

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