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Testing fans operation

When I unplug the thermofan switch and jump the terminals the drivers fan goes in fast speed... Shouldn’t it run in slow speed? What may be the problem here?
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1984 Black 944 (w/'83 engine)
2015 Kia Rio Quinto
Old 07-24-2019, 02:36 PM
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9FF 9FF is offline
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There are three terminals: a common ground, a fast speed and a slow speed. You must have it jumped between the fast speed terminal and ground, try jumping the other terminal for slow speed.
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Mike A
9TECHNIK | TRANSAXLE ÄRA
1986 944 (Street); 1986 944 (Track); 1986 951; 1989 951 (3.0L 8V); 2000 996 Cab.
Old 07-24-2019, 02:58 PM
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Quote:
Originally Posted by 9FF View Post
There are three terminals: a common ground, a fast speed and a slow speed. You must have it jumped between the fast speed terminal and ground, try jumping the other terminal for slow speed.
Mine’s an 84 944. The thermofan switch has only 2 terminals. According to Clark’s test if those cables are unplug from the thermofan switch and jumped, the drivers fan should run at slow speed. And if the ignition switch is turned on, both fans should run fast.

Last edited by morbid; 07-24-2019 at 04:03 PM..
Old 07-24-2019, 04:01 PM
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9FF 9FF is offline
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Quote:
Originally Posted by morbid View Post
Mine’s an 84 944. The thermofan switch has only 2 terminals. According to Clark’s test if those cables are unplug from the thermofan switch and jumped, the drivers fan should run at slow speed. And if the ignition switch is turned on, both fans should run fast.
Gotcha, Im pretty sure that’s normal for the early cars, this may help:

Early Fan Operation - Clarified
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Mike A
9TECHNIK | TRANSAXLE ÄRA
1986 944 (Street); 1986 944 (Track); 1986 951; 1989 951 (3.0L 8V); 2000 996 Cab.
Old 07-24-2019, 04:58 PM
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Quote:
Originally Posted by 9FF View Post
Gotcha, Im pretty sure that’s normal for the early cars, this may help:

Early Fan Operation - Clarified
Thank you for that link! Now I’m clear. 🙌🏼
Old 07-24-2019, 05:52 PM
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