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Re: temp gauge affected by headlight switch? Help me on this one... 200 1986

posted by  someone claiming to be norfleet on  Mon Oct 30 17:02 CST 2000 [RELATED]

one thing to remember- the temperature range in the volvo 240 temp gauge (the green area) is only 15 to 20 degrees F (from bottom of green to the bottom of the red zone. do not worry about minor movement of the needle.

it sounds like you have a weak battery or a marginal altenator. a temperature sensor is a resister. resistance is a function of voltage and current. with the ignition on (and engine off), turning on the headlights dropped the voltage. The equation is V=IR, you change the voltate, you change the resistance (if the current is kept constant). this is why I think you have a bad battery. there should not have been a noticeable voltage drop in that short of time period. (with the engine off, there was no regulator/alternator to keep the voltage constant). also, a running engine keeps the voltage about 13+ volts. no engine on, the voltage drops to 12.5 or less volts. Have your battery checked.





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