Hey all,

Just starting to gather bits together for the electronic side of things and I noticed there doesn't seem to be a fan relay on a sierra.

The wiring goes:
Battery positive --> S102 (via Fuse Link Wire)
S102 --> Fan Motor (via Bk wire)
Fan Motor -> Fan Switch (via Bn/Bk wire)
Fan Switch --> Ground (via Bn wire)

I would assume that the current drawn by the fan would require a relay. So my question is really: is the fan switch (thermal i presume) able to take the current?

Its a 1989 1.8 cvh sierra if that helps.

Thanks,
Chris

Short answer...Yes.

It's the fan switch and Ford made it to take the load of, guess what...a fan!

adrian

I guess i was asking for that.

Yep mine runs without a relay as it did in the sierra.

I was going to add a relay anyway but on testing the fan it only draws 7A so I didnt bother.

whats a S102?

quote:

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Originally posted by blakep82
whats a S102?

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Sorry mate, but someone was going to say it so I thought I'd get in first.

adrian

hmm, what thread is on the ford fan switch? my fan draws 5A (nearly 7A on start up for about 1 second) whould be a lot easier than wiring in relays and stuff