Coolant leaks after the engine is turned off, why??
it started over a week ago. After I drive it for a while (e.g. 1/2 hour), when I turn it off, it leaks a large amount of coolant through the overflow tube in the reserve coolant tank. Each time it looses more coolant than you can see through the transparent ( well, maybe..) tank.
Anybody knows what the problem is? Could it be the cap of the tank, which seal is over it's prime?
I don't think it happens when I drive (i.e. the water pump runs), because the car doesn't overheat, and I never saw it when stopped, but still running the engine.
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Brian - Winner of "Best Bent Rod" Smokey - 1986 951 That is being rebuilt again.... Even betterer.... Breadbox - 1993 VW Passat
"I got kicked out of Barnes and Noble for moving all the Bibles to the Fiction section."
"The first 50% of the project takes 90% of the time... The rest of the project takes the other 90% of the time."
"Remember, if you can't fix it with a hammer, you've got an electrical problem."
Sounds like there is air getting into your coolant system, either the cap, like these knowledgable guys have stated or there is a pin hole leak in the expansion tank, radiator, or hoses.
Start by getting a new cap and bleeding the coolant system to purge all the air. If thing do not improve pressure test everything and hunt for a leak.
I put the new cap, and the problem seems to be gone.
Originally Posted by bearone
your older ride takes the lower pressure cap.
i thought i had a bad cap on my 84 and put one rated at 13 psi.
i had leaks i'd never seen before.
it's just building up too much pressure.
Well, the new cap is labelled 13lbs/90kPa. According to the above it's wrong.
The original is labelled 100 (no unit, so I presume 100kPa), which is even higher, meaning my new cap should be OK. I don't have leaks as of now, but will get the correct cap if required.
Could someone confirm the pressure of the cap on 1983 944?