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Old 12-25-2019, 11:55 AM   #9
shortboxin
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Join Date: Jan 2019
Location: Mesa
Posts: 37
Re: What temp of radiator fan switch?

Quote:
Originally Posted by hatzie View Post
VAG Gruppe vehicles from the 70's & 80's switched the radiator fans on when the radiator temp reached 205°F.

If the heads are 10°F hotter then you want a thermal switch in the heads to switch somewhere between 215°-220°F.

You also want to switch the fans on with the AC compressor.

50:50 Coolant mix at 0psi boils at 220°F. With a properly sealed system and a 16psi cap it boils at 250°F.
Thank you. That's the kind of info I was looking for.
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