Fan clutch resistance question

[codfish]

How much resistance should a cold fan clutch have when spinning it by hand? I can move it. But it certainly won’t keep spinning when I stop moving it. It’s stiff but it moves.

I’m trying to figure out why it never gets above 130-140°.

Gonna get another thermostat today and throw it in. I’ll test it in water before I install it. New coolant sensor already installed. In the head.

Aluminum rad last year due to busted stock one.

Fan clutch next suspect.

Codfish

 

[PrairieDrifter]

It should spin like 1/4-1/2 revolution with a good flick maybe a little more.

 

[75gmck25]

it’s full of fluid, which might have settled/gelled when it got completely cold. You might try starting up the truck, let it run for about 5 minutes, and then recheck the clutch to see if it loosens up a little.

Howeve, it sounds like it is probably working correctly.

 

[codfish]

Good point

I’ll try that

 

[codfish]

Still “stiffish” after 5 mins of running.

Well after going to town twice for a thermostat (wrong one in the first package-160 instead of 195), I have more questions. Maybe I’ll start a new thread.

After installing a new 195° thermostat and cleaning up the stock sending unit’s wire connection, I can watch the factory gauge creep up to 195-200, and watch it go back down when the thermostat opens. Great! I used my temp gun to confirm..

However, the temp readings on my Holley Sniper screen shows 150° or so. This was just idling in the driveway. Taking it on the highway in a few minutes so I’ll see what happens in driving conditions.

Why would there be such a difference in temps from the head to the thermostat housing? This is with a SMP sensor, as I assumed the supplied Holley sending unit was out of whack like others have suggested.

I was told the head is a better spot for the sensor. Might have to put the sniper sensor on the thermostat housing so I can get the required temperature for the sniper system to “learn”.

Thoughts?

Codfish

 

[nvrenuf]

Seems like I remember reading about issues with the Sniper temp sender. Maybe check the EFI sub forum on CK5.com

 

[codfish]

Yeah I’ve already ditched the Holley temp sender for an aftermarket sender.