Radiator Fan

[MadOgre]

Unfortunately I don't have any extras. sorry

 

[firebane]

What squares came with them so I can reference? I'm looking at RA and they have the clutches but not the fans.

 

[MadOgre]

81-87 for sure

 

[firebane]

So... back to the wreckers as not only does the fan matter but so does the clutch. Apparently reverse rotation matters to both the clutch AND fan.

 

[firebane]

So I just want to update this with a few things.

First I found a 6 blade GM fan which I am now using. I also replaced the clutch fan and now have a Hayden HD clutch fan.

Even with all this and the truck running I still cannot get my truck warm enough to get the thermostat to open!!

I'm honestly out of ideas and will be putting a place in front of the thermostat neck to redirect airflow around it.

** Edit **

Just did some reading and it seems there could be a different sized water pump pulley and crankshaft pulley. Which could cause a fan to spin to much or too little.

What size is OEM pulleys from GM?

 

[firebane]

More updates.

Was suggested to block flow to the heater core and this made no difference. So I put a piece of plywood in front of the radiator and this did in fact help.

Once I secured the plywood the temps went up as normal and thermostat opened and coolant flowed. When I did this I found that there was far less air flow all together as well as less air being blown on the thermostat housing.

I am honestly out of ideas.

 

[MadOgre]

Cut a couple fan blades off! LOL

 

[firebane]

well 5 gave me the same trouble as 6 so trying to find a 4 blade will be next to impossible

 

[MadOgre]

No I meant redneck style!

 

[MadOgre]

I like my factory 3 blade with the thermostatic clutch

 

[firebane]

well I may check the yards but my luck of finding a 3 blade would be pretty slim.

 

[MadOgre]

Maybe time for electric ?

 

[firebane]

could a improper fan shroud cause these issues?

 

[MadOgre]

What temp thermostat are you running. I had the same issues with the 180. The only way my truck runs good is with the 195. Maybe if you lived in a dessert you could use the 180 but north of the border even the Northern United States, I would use the 195