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Originally Posted by shivparekh
Thanks for your help with this issue.
I have 2.0 I4 engine with auto transmission.
If you mean cold air thru cabin vents, that seems normal without any issue. I had a mechanic do the diagnoses, and the water pump is fine, also the coolant pressure check turned out to be ok. Also, time to time i have looked at the oil dip stick , and haven't found any sign of coolant mixing with oil.
Midas did the same diagnoses, and they found coolant under the engine body, and determined that there's a blown / damaged head gasket. but the previous (local) mechanic told me that i can live without changing the head gasket as long as i maintain the oil level to certain point.
When ever the car heats up to more than half on the gauge, the revs would start going crazy as if you are driving at high speed in lower gears and at the same time, i felt gears start changing randomly.
I also read somewhere in this forum that this is a problem many or atleast few have experienced with ford transmissions of early built. and some suggest, to let the engine cool down and then you can drive again with no problem until it heats up again.
I have read many threads / thread replies from you, i feel like my case is in good hands now.
Thanks again.
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I guess what I should have said was if it blows cold air with the heat is turned on, your waterpump isn't moving coolant. But I'll take your word for it that everything is working correctly.
If it were me, I would at least drain the oil and inspect it. If its fine, you can put it back in. On a similar note, does the coolant appear to be a milky brown? If both of these check out fine, then I think you can rule out a blown headgasket. You haven't noticed any white smoke and your losing it pretty quickly so I think your losing it somewhere else. Trust me...I've ridden in a car with a blown headgasket, and the amount of white smoke it produces is unreal. You couldn't even see while driving. Anyways, have you checked all the hoses that connect to the coolant resevoir? Is the overflow hose connected? The coolant system needs to be pressurized. This is what prevents the coolant from boiling. If you have a leak somewhere, the coolant is just going to boil and spew out everywhere. I'm guessing that's what is happening.
As for the mechanic that said you can just run more coolant with a blown headgasket is a complete idiot. First of all...water is not compressible so if thats leaking down into the combustion chamber, you'll pretty much be guaranteed to bend a rod. Secondly, if that doesn't happen, you'll probably crack a ringland on your piston. Throwing 200F degree coolant on a 1000F degree piston, has bad news written all over it.
The simple way to diagnose whether its the engine or transmission is does the engine still have an erratic idle when the transmission is in neutral? If yes, it's not your transmission.