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-   -   Testing fans operation (http://forums.pelicanparts.com/porsche-924-944-968-technical-forum/1035557-testing-fans-operation.html)

morbid 07-24-2019 01:36 PM
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?

9FF 07-24-2019 01:58 PM
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.

morbid 07-24-2019 03:01 PM
Quote:
Originally Posted by 9FF (Post 10535396)
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.

9FF 07-24-2019 03:58 PM
Quote:
Originally Posted by morbid (Post 10535471)
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

morbid 07-24-2019 04:52 PM
Quote:
Originally Posted by 9FF (Post 10535530)
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. 🙌🏼


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