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Posted by Ari [Email] (#2847) [Profile/Gallery] (more from Ari) on Mon, 14 Aug 2006 10:21:57 Share Post by Email
In Reply to: Temp Gauge Fluctuations, Tarooka [Profile/Gallery] , Mon, 14 Aug 2006 09:52:37
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Your '94 still has the old version of software in the EDU that didn't smooth out the temp gauge readings.

The purpose of the radiator cooling fan is to blow air across the radiator when the normal airflow from driving is missing - like sitting in traffic. Much above about 30 mph, I don't think the fan provides more airflow than the normal blast of outside air you get when the car is moving.

As you go up the hill, the engine works harder, and produces more heat. That may be more heat than the radiator can throw off, so I can see the temp gauge climbing. Going downhill, the engine load is minimal, so the engine produces a lot less heat. You may even be going faster down hill, so you get more airflow.

The result is that the temp gauge goes up and down. To confuse matters more, the temperature you see on the gauge is only loosely coupled with the radiator fan. The temp you see on the gauge is at the engine block, and the flow to the radiator is controlled by a thermostat. The radiator fan comes on when the radiator gets hot - it doesn't care about the engine temp. We like to think that the temperature of the coolant is the same everywhere, but it can't be - it's hotter leaving the engine (and entering the radiator) than it is leaving the radiator and entering the engine. So there are some wacky time lags involved.

If the engine is undergoing large load changes, it makes sense the temp gauge would be moving about. As long as you kept your speed up, the radiator fan wouldn't be much of a factor.

posted by 192.249....

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