YOUR RESEARCHCoolant temp drop with A/C on
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Keep in mind, though, the engine is still not very hot.
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I've had my 996 about a month and have noticed the coolant temp drops AT LEAST 5 degrees F with the AC running. I live in Houston, so heat is always an issue and we always keep an eye on coolant temp. Previous owner noted this coolant temp drop as well when the AC is on. Has anyone else experienced this delta? Typical for 996s??
The reason is the radiator cooling fans come on by default whenever a/c is on. You should make sure your low and high cooling fan speeds are working. Easiest way is with a Durametric. If your low speed fans aren�t working (common and due to old/bad ballast resistor) you�d see a more significant temp drop with the a/c on, as it will kick on the low speed fans independent of coolant temp.
Same thing as in most cars. Cooling fans generally come on (unless engine driven fan) when ac is turned on. Ultimately though, I have to figure that the heat load from the condensors and ac compressor engine load will ultimately result in higher engine temps, but initially there would be a temp drop.
....it's kinda crazy, ive never seen anything like it. My coolant temp will drop by a minimum of 5 degrees and often times it's closer to 10 degrees. From 190F or wherever its peaked at, then always down to 180F and sits there. I haven't seen it go back up but will keep an eye on it.
Quotes source post: 19065951
Yes, but zero airflow across those radiators results in zero engine cooling. So even with the AC on, adding to the heat load, more airflow is better, still. Unless you�re driving down the highway at 55mph+ of course.
Quotes source post: 19066112
Yep. Keep in mind, though, the engine is still not very hot. It can and will get up to well past 200F and that�s still not that hot. High speed fans come on at 215F. One good thing about having lower coolant temp is that oil temp will also be lower.
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