Question I have pressure tested the cooling system. Held 15 pounds for more than 30 minutes. Replaced thermostat. Cooling fans are operating, no 'milk' in oil, and car does not seem to be miss-firing. Suspect coolant is being forced out overflow in reservoir, but not sure. Coolant loss is evident, but unsure where it is going. Drove car on highway around 40 miles with no problems. Can't make any sense of why it is overheating.
Answer Hi Vance,
It sounds like you may be loosing coolant. The other pathway to consider is that there is a leak between the cooling system and one of the cylinders via a head gasket leak and is being blown out the tailpipe which you won't likely notice unless you check it first thing when starting the engine from cold. You will see some white smoke which when it condenses on your skin will smell of antifreeze. So look for that possibility.
If you find that you are getting some coolant coming from the tail pipe, and if it is a minor amount, then you might try re-torqueing the cylinder head bolts. Back them off a couple of steps and then re-torque them to spec. Let me know which engine you have for the details. I have had success with such a situation by doing that.
Otherwise verify that the radiator fins and not occluded by mud.
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Thank you Roland for your timely response. Your answer has helped me, thanks again.
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