Cooling fan sensor location

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93ragtop

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This is on a Dakota, so please bear with me.

Currently, I have a 87 V6 3.9 engine, with 2 pusher fans mounted in front of the radiator. (The way Shelby did in 89)
My fans are set up, so I have one sensor in the top of the intake manifold, and the second sensor is in a 38mm (1.5 in.) cooling sensor adapter. (see example below)
I need a 44mm or 1.75 adapter for my new motor (5.9 magnum) and I cant find anyone who makes one.
I was wondering if it would be ok to use one of the drain plugs in the block?
I want the second fan to only come on when the first fan cannot keep up.
Also, I considered tapping a 1/8 NPT hole in the inlet side of the waterpump.
Any suggestions would be appreciated.

s-l1600.jpg
 
When I used two fans I had two variable temp relays and had them set to come on at 185 and 195 degrees. First fan came on a 185 and if the temp got to 195 the second fan would come on. If temp dropped below 195 the second fan would turn off. Don't know if this helps but it did work good.

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DSC06606.JPG
 
Treblig said:
When I used two fans I had two variable temp relays and had them set to come on at 185 and 195 degrees. First fan came on a 185 and if the temp got to 195 the second fan would come on. If temp dropped below 195 the second fan would turn off. Don't know if this helps but it did work good.
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Click to expand...

That would have probably been the best way to go...... I didnt know they had an aftermarket variable temp sensor......
I had already set up the 2 fans independent of each other, on 2 sensors as well as AC taps the same way. For now, im going to try to stay with a sensor somewhere between the bottom of the radiator and the engine block.
I dont think the drain plug in the block is a good idea.
But thanks for your help.
 
DrCharles said:
Looks like Flexalite makes one, but it's not cheap:
Click to expand...

Thanks for the link!! The only problem is going to be the length...... getting it to fit in the lower hose. Its tight down there! But it got me to thinking, that I could get a 1.75 section of exhaust pipe, a pipe nipple and make one.
 
93ragtop said:
That would have probably been the best way to go...... I didnt know they had an aftermarket variable temp sensor......
I had already set up the 2 fans independent of each other, on 2 sensors as well as AC taps the same way. For now, im going to try to stay with a sensor somewhere between the bottom of the radiator and the engine block.
I dont think the drain plug in the block is a good idea.
But thanks for your help.
Click to expand...
One more thing that I forgot about........I also wired the two fans to both come on when the AC compressor comes on. So the AC bypasses the variable temp relays.
 
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