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Temperature Compensator Board[240-260/87] posted by Jack Paltell on
Monday, 18 May 1998, at 9:48 a.m.
Still struggling to correct an unpredictable temperature guage.
Guage still reads dead cold about half the time and is variable the other
half of the time. I've replaced the wire from the coolant temp sensor to
the temp guage. I've replaced the temperature sensor too, but things still aren't right. Thanks to all who offered advice on replacing the sensor.
I finally reached it with a 17mm open end wrench by removing the distributor cap and rotor. Manifold did not have to be removed. Just about all that's left to fiddle with is the temperature compensator board.
Stupid question: what is a temperature compensator board, what does it look
like and where is it located in my 87 245? Can I fix it, or must it be
replaced?
Re: Temperature Compensator Board[240-260/87] posted by Robert Mohr on
Monday, 18 May 1998, at 11:14 a.m.
There's a real good description of the procedure for replacing this board in the Bentley Manual. If you are Bentley-Deprived, I'll give it a shot:
Pry out the "snap in" panels for the gauge spaces, remove the headlight and instrument light adjustment knobs and pull out the plastic panel behind them.
See the 4 screws holding the instrument panel in? Remove them and pull out the instrument panel about 4 inches.
Pull the wire plugs on the back of the instrument panel. Hopefully, it's an electric speedometer. If not, unplug the speedometer cable.
Pull out the instrument panel. Place it on your workbench or kitchen table, gauges side down. Remove the screws that hold the back (where the gauges are attached) from the plastic housing.
The Temperature Compensator Board sticks up from this printed circuit board, right by the temperature gauge. It's a small, rectangular printed circuit board, about 1X2.5 inches that is held in place by a plastic clip. Just hold the plastic clip ear open and wiggle the board out. The board plugs into 4 pins in the instrument board back.
Hope this helps, I'm going by memory here ( I just replaced mine last week).
Bob Mohr
1983 242 Flathood B21FIT
1992 245 B230F
Re: Temperature Compensator Board[240-260/87] posted by abe crombie on
Monday, 18 May 1998, at 11:24 a.m.
Follow Robert's instructions up to the point of replacing the comp board. The problem is with the small rectangular pins that stick up from the main cluster board and the "sockets" on the comp board. The sockets need to be closed slightly to make a better connection by pushing in on the two sides. If you look carefully at the sockets with a magnifying glass you will see how they grasp the pins. Then clean the pins that stick up from the main board with fine grit sand paper and then apply vaseline to them prior to re-installing the comp board.
Any faulty ground connections between battery and engine or cluster and chassis will give the same symptoms but usually include erratic fuel gauge that acts up when you apply high electrical loads (like high beams and high blower at the same time).