Mystery coolant leak

David Head v8q at
Tue Aug 13 07:26:39 EDT 2002

Mystery leaks on 5 cylinders are usually a bad waterpump. It starts as a
small leak that actually evaporates because it gets redirected behind the
second shield (back timing cover) in the front of the engine. You don't see
it after parking because as the engine cools it draws a slight vacuum on the
cooling system as the coolant contracts...
After the car has partially cooled, remove the reservoir cap. Wait another
hour or so and recheck the front of the engine for leaks.

BriceW at wrote:

> I took a short drive yesterday and my low coolant light came on. I
> pulled into the garage and noticed a big puddle of coolant on the floor.
> I opened the hood and sure enough the expansion tank was almost empty.
> I then re-filled it and started the engine up to find the leak. No leak
> appeared anywhere. I then test drove it and went over 60 MPH with the
> air conditioner on lo cool and high fan. The temp outside was 96.
> Still no leak.
> I have checked every hose and nothing.
> A month ago I did the neck repair on my half plastic original radiator.
> I checked the repair and it was holding fine.
> Could the plastic on another part of the radiator have a hairline crack
> that only leaks sometimes?
> I have been waiting to replace the radiator becuase I want to get the
> Nissens #60437 all metal one.
> I am very puzzled by this and am not sure where to look.  Now that I
> want it to leak it wont leak!
> Now I am afraid to drive a long distance especially without carrying
> gallons of coolant with me.
> Also should I try one of the radiator stop leaks products.
> I have 102,000 miles.
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