Cooling Fan Switch

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Cooling Fan Switch

Postby DUCeditor on Fri Apr 27, 2012 9:42 am

Last summer I noticed that the cooling fan on my `77 never turned on. Since I almost never drive in traffic I drove all summer that way but knowing that heart ache was waiting if I did not find out why I asked my mechanic to give it a quick once over.

He said that the fan itself was fine -- it turned on when the switch was bypassed -- and suggested I get a replacement switch which I have done.

Can someone tell me, does this screw into the core of the radiator itself? I.e., will coolant come out when I remove the old switch? If not replacing the switch will be a few minutes work, otherwise... :cry:

-don
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Re: Cooling Fan Switch

Postby maytag on Fri Apr 27, 2012 9:56 am

yes. screws into the bottom tank of the radiator.

very wet behind it :wink:

good time to flush! :lol:
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Re: Cooling Fan Switch

Postby DUCeditor on Fri Apr 27, 2012 11:04 am

maytag wrote:yes. very wet behind it :wink: good time to flush! :lol:


Yes! Thanks. Now I won't have to answer any looker on's question "Hey, what's that puddle?"

(especially since anti-freeze is poisonous to many animals)

:)

-don
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Re: Cooling Fan Switch

Postby Kent124 on Fri Apr 27, 2012 11:12 am

Might be a good time to change hoses while you are at it.
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Re: Cooling Fan Switch

Postby manoa matt on Fri Apr 27, 2012 10:14 pm

The recommended replacement intervals are: Hoses every 4 years, coolant every 2 years.

Since the system is sealed you can remove the existing switch and reinstall a new switch without much coolant coming out. If you open the rad cap, or any other place it will gush out as air can enter the system as the fluid is escaping.

However the cooling system is often the most neglected, (coolant hoses degrade from the inside out) so drain it, flush it, add new coolant.
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