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#1
04-29-2012, 01:06 PM
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Best place for temp switch?
The electric fan in my 73 T/A is controlled by a manual switch - aint the smartest setup, so want to change it for a thermostatic setup where the electric fan automatically comes on when it hits 180deg.
In terms of a location (other than the block) is the drain plug a good location to put a temperature switch for the electric fan? I'm looking to have the switch kick in at 180 and off at 160/170. I'm looking to put in the bottom left corner of the radiator below:  If so, what size temp switch do I need based on the size of the magnetic drain plug below?  
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#2
08-04-2012, 09:36 AM
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I was gonna post the same question and found your post. I was thinking of putting mine in the manifold near the thermostat. Is there a problem with that location? I realize most people are running a control at the radiator but those systems cost more than I care to pay but at the same time I dont want to sacrifice performance or reliability of the system.
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#3
08-04-2012, 12:40 PM
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Since that plug has a gasket, it's probably a straight thread; I think most senders/switches have a pipe thread, which is a tapered thread and does not use a gasket. It probably won't fit there.
George
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"...out to my ol'55, I pulled away slowly, feeling so holy, god knows i was feeling alive"....written by Tom Wait from the Eagles' Live From The Forum |
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#4
08-04-2012, 04:31 PM
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Put the fan control switch in the water cross over between the heads.
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Bill 64 GTO, tube chassis w/606" IA tall deck, PG & a pro geared Fab 9". 2750 lbs. 8.2550@164.17-1/4, 5.2901@131.97-1/8, 1.1981-60-ft. 8/10/08 
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#5
08-04-2012, 07:32 PM
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yea, thats the spot Im talking about. I just never hear anyone taking about it on here.
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#6
08-05-2012, 04:00 AM
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I have a dual speed fan, and low kicks on at 180, high at 195. I have the 180 switch in the passenger head, and the 195 switch in the driver's head. I have a mechanical temp gauge in the intake water crossover.
My switches were threaded for 3/8 NPT. I had to get adapters (3/8 -> 3/4, I think?) to fit them in the head passages.
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