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Expansion tank level probe. New tank, probe not working. 850 1995

posted by  Erwin on  Sun Jul 22 07:39 CST 2007
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last visit: Thu Oct 23 10:39 CST 2014
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Hi guys,

I replaced the leaking expansion tank in my '95 855t last week. It had a small crack at the base of the cap threads and was slowly seeping coolant.

I pulled out the coolant level probe that snaps into the bottom of the tank and popped it into the new one, connected the wiring and filled the tank above the "Min" mark. I didn't find out till the day after that I had not tightened the hose to the bottom of the tank sufficiently (puddle of coolant behind wheel) and found the tank empty. While empty, the low-level light did not come on one the dashboard.

I unplugged the probe's connector and still had no light, so I'll assume an open circuit or high resistance must mean level is ok. Shorting the harness connector's two contacts lit the low level idiot light so that eliminates everything except the probe.

Are they sensitive to being popped in and out of their fittings on the X-tank or maybe require a certain orientation in their mount to have them be triggered by the float in the tank?

I'm prepping the car for my move from Memphis to Roanoke VA and would like to have this circuit working for the 10 hour drive for a little peace of mind. (I'll be more worried about the T-belt I'm putting in this week) Once in VA I'll be in an apartment for a month and won't have the time or a place for car maintenance until we find a house.

Sorry so long,

Thanks,

Erwin in Memphis






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