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I just bought a 1991 corvette. I bought it in and drove it home some 250 to 300 miles mostly on the highway. It was running well all the way except when we took it off the highway near my home. It started to overheat than the transmission started to slip. When we checked it the waster in the overflow did not get sucked into the radiator. Outside of the cap what would stop this from happening? The transmission does not have any reverse and I have been told it could be a vacuum line. Any help please e_neustadt@yahoo.com
1) if you see no obvious coolant leaks, drain a little oil to see if there is coolant in there. If sounds like the coolant fan may not have come on, causing an overheat.
If not, refill and watch the temp gauge and fans to see if the fans come on at the proper temp
Inspect the hose from the resevoir to the radiator for any blockage
2) check fluid level for the A4; fill to the mark if needed
If fluid is ok, you likely will need to visit a good tranny shop
1.) Did you remove the cap? The level in the reservior should rise when the car is warmed up and gradually drop when it cools. If the radiator isn't full to begin with (air in the system) the reservoir ca't function as it should. Then of course the coolant could have escaped pasted the head gasket, as eluded to above.
2.) There are no vacuum lines to the trans. I hate to say it, but that trans is toast.