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TEMPERATURE GAUGE 700

posted by  jimnau on  Mon Apr 26 07:03 CST 2004
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last visit: Sun Jul 6 09:52 CST 2014
[RELATED]

I had the same problem on my '91 740 a couple of years ago. Sounds like your thermostat is broken. With a broken thermostat, it is always open, so engine is very slow to warm up; also, falling coolant temperature as you drive since more airflow through the radiator results in lower temp. coolant leaving the radiator. I am on my third or fourth thermostat--I have stopped counting.... just another routine maintenance step for me.

If your temperature gage acts erratically, your temperature sending unit is probably wearing out--it is a temperature-sensitive resistor. You can test by placing a 100 ohm resistor (from Radio Shack) between the leads of the wire going to the sending unit. When this is done, the gage should read normal. The sending unit is a bit tough to reach, but you can get to it to replace it. My bet, however, is a broken thermostat.

Good luck,
Jim Nau
'91 740 130k






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