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Re: Coolant expansion tank cap ?
In message <001901be6059$17fa7b80$03000004@niederst> "Craig D. Niederst" writes:
> My '92 100 seems to lose coolant from time to time through the cap on the
> coolant reservoir (like tonight in the garage!) . Do these caps have
> pressure regulators or the like built into them to relieve excess pressure
> when needed?
Yes, they open at nominal 1.4 bar.
Probably an issue with the radiator temperature switch. If you're
extremely unlucky, the head gasket has blown and combustion products
are being blown at high pressure into the water jacket. An experienced
mechanic just needs to smell the coolant header tank.
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