I have a Ford 302 and just bought a fan relay kit for it. The kit has a temperature unit that screws into the manifold to act as a ground. The manifold has the gauge temp sending unit already installed. Can I mount one of the two sending units into one of the 1/4" holes in the block? My thoughts were to put the fan relay sending unit into the manifold and than get a new 1/4" unit and put it in the block. Any one tried this?
You will not get correct temp readings from block. What you are after is cylinder head/coolant temp, use a "T" fitting on the used port.
There are heater hose outlets that have places for sending units,sensors and ported va***n switches that might help you,my 89 crown vic with a 302 has one for a single switch and I picked up one from a 89 crown vic with a 351 that that has a outlet for two switches.
I ran my fan relay sending unit in the head of my 289. Mainly due to the thought,witch maybe wrong, that by the time the manifold gets to the sensor temp to kick on its already hot. I ran a 185 unit, checked with my IR thermometer it would kick the fan on at 180.
I needed a similar sender on my non-Ford. I cut a piece of 1 inch thick aluminum shaped like the thermostat gasket. Then I tapped a hole thru the side of it. It basically spaces the t-stat housing up an inch. Gave me an additional sender below the level of the thermostat. my 2¢ .bjb
Thanks for the info. I found a thermostat housing with a sending unit hole in it that solved the problem. Thanks again!
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