Odd overheating

[Raymond]

While driving at highway speeds the temp gauge will climb way too high for my comfort. But slowing down to stop & go traffic, it cools down nicely. Recently on the Interstate, the car was running hot and we came to a traffic jam where we went from 75 to about 5mph. The car cooled right down.

It would seem to me that the car would benefit from the air flow at speed with the outside temperature is under 70 Farenheit. The coolant is full, the radiator is clear, the fans work. It's an '89 325i converted from an automatic, to a five-speed.

Any suggestions?

[89Bmw325i]

i had a similar problem, but mine would just start to overheat and not cool down. i took it in and they changed my thermostat, and now it is working just fine. i have a 89 325i also.

[witeshark]

Was there a transmission cooler that was by passed when the conversion was done?

[89Bmw325i]

i didnt convert from automatic to 5 speed. my car was just overheating they changed the thermostat and the problem was fixed. is yous do to the conversion?

[witeshark]

It was a thought since I know autos have transmission coolers. Mine was never converted either.

[89Bmw325i]

oh well then i dont know sorry