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Re: High Heat on Highway[240-260/86] posted by Don Foster on
Monday, 15 June 1998, at 6:30 a.m.
Nick ---
I chased that problem on my daughter's '86 245.... new water pump, new thermostat, new belts, cleaned and flushed the radiator twice, new antifreeze. Same symptoms you have. Finally I pulled the compensating board, resoldered it and the connecting pins on the dash cluster, and cleaned the surface of the pins. The temperature was OK, but the gauge was giving a false indication. The car has been fine for 2 years and 35k miles.
However, I helped a friend with an '87 244 -- same exact symptoms -- and it turned out to be a marginally-plugged radiator. (In his case, we attached a thermocouple to the top hose and confirmed that when the dash gauge went into the red, the temperature was actually 240F.)
There's no single right answer.
--Don Foster
Re: High Heat on Highway[240-260/86] posted by Robert Mohr on
Monday, 15 June 1998, at 7:51 a.m.
Just had the same problem last weekend on my 1992 245. The temperature gauge would zoom right up to the beginning of the "red band" and wouldn't come down until after I'd exited the highway.
I'd already done the temperature compensating board replacement/pin cleaning routine. I'd also replaced the temperature sensor. My auxiliary a/c fan was coming on, radiator didn't appear to be plugged anywhere. I was really scratching my head....
Took the car to a carwash and cleaned the radiator and a/c heat exchanger (blowing it from the inside of the engine compartment out). Man, did I get a lot of bugs and crud out of the a/c fins! Kinda surprised me, as neither the radiator or the a/c unit looked very dirty upon initial inspection.
Back on the road, the car cools great. I'll follow up this half-arsed cleaning job with a full radiator pull/antifreeze replacement in a few weeks.
Hope it works....
Bob Mohr
83 242 Flathood B21FIT
92 245 B230F