thermal switch..2prong vs 3prong?

M

mkehler

New member
Okay, lame question..but on your typical 80's VW rad (88 Scirocco non-AC 16v in this case) whats the diff with the 2 prong vs 3 prong thermal switch? What does the 3rd prong function as?

thx
Matt
 
Three terminal connectors are used with two-speed fans. Low speed (continuity on switch terminals 2 & 3) comes on between 198 to 208 degrees (F). High speed (continuity on switch terminals 1 & 3) comes on between 210 to 221 degrees (F).
 
Dr. Ryan is right as usual!
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MARRS #25 ITB Rabbit GTI
SCCA 279608
 
No, it actually depends on what the switch is set for. I've got a 2-prong that's set for 180.

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MARRS #25 ITB Rabbit GTI
SCCA 279608
 
Ahh yes...now that you say it..I seem to recall there being a ' 90 95 ' on the plug..so it'll turn on at 95, off at 90....which my handy conversion dealie says 203 and 194 fahrenheit.

thx!
Matt
 
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