General repair shop flushed system,installed new theromostat, new cap and reservoir, still losing coolant through cap. Static pressure test performed, no leak indicated. Mechanic commented that coolant system appears to be ingesting air when engine stopped. No oil noted in coolant system and no coolant noted on oil dipstick. He is not sure what is happening.
Try to run the engine while the cup is removed, and check if there are any bubbles formed, it could be that the cylinder head gasket is burnt
SOURCE: coolant leaking from reservoir cap in a 2000 ford taurus.
no your cap is set to release that pressure by a spring in the cap check the reservoir for the o-ring it could be bad or missing
SOURCE: leak around oil pressure switch on ford taurus 1994
the internal seal has gone ,renew the switch
SOURCE: Coolant Problems
Hi there. It sounds like you have done the most obvious checks and I can assure you by-passing the heater core will have no effect. There are three possible causes that you need to investigate further and you will need specialist equipment for it - you either have a hair-line crack in the head or cylinder wall or it might be that the head bolts are stretched and therefore weakened and so need replacement. To help you identify these aforementioned possible problems, you might need a specialist fluid that you put into the cooling system which changes colour when combustion chamber pressure enters the cooling system, you need to contact your local Ford Dealer for this - but then you still have the three possible problems to deal with - cracked cylinder wall/s, cracked head or stretched head bolts. Hope this helps, Scottech.
SOURCE: 2002 Ford Escape V6. Oil indicator light on, but pressure holds.
My 2002 Ford Escape had exactly the same problem as described. Dealer replace oil pressure sending unit (oil pressure switch) and problem still existed while leaving dealer about 3 miles away. I took the car back to the dealer again in two days and the oil pressure light kept of blinking sporatically all the way to the dealer. Dealer checked connections and they drove the car around and the oil pressure light never came on. I picked the car up from the dealer and I've had no problems with the oil pressure light flashing. I wonder if there is a microprocesser in the oil pressure sending unit which has to be given some time to be recalibrated to the cars main computer module?
SOURCE: 2001 ford focus wagon coolant problem- Pressure
You may be developing a worn head gasket which can allow oil to flow into the engines cooling jacket. If your engine is running rough this is usually a good idication that there is a head gasket leak.
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