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12-25-2019, 10:58 AM
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#8 |
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Moderator
 
Join Date: Oct 2008
Location: Wentworth, NH
Posts: 5,049
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Re: What temp of radiator fan switch?
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.
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