Cooling Fan question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Andrewman · 06-08-2013, 11:51 AM

Hello all,

I have a 1970 Chevy C20 that I am slowly restoring. I would like to install a thermostatic fan clutch in place of the flex blade fan. The engine is a 350.

My question is, will I need an engine fan-to-water pump spacer with a fan clutch to position the fan in the shroud correctly?

Currently, there is a approx. 2.5 inch spacer on the flex fan in my truck.

I am planning on ordering a 6 blade fan and standard duty thermostatic fan clutch.

Any photos would be great.

Thanks in advance!!!

**WIDESIDE72** · 06-08-2013, 11:55 AM

On my 72 c10 with a 350 a p. O. Replaced the fActory clutch fan with an aftermarket flex fan. I found a factory clutch and fan on the parts board. The spacer is part of the clutch. I don't think the 70 trucks had a clutch fan but I don't see why a 72 wouldn't work. Not sure if 71 had them or not. Just be sure to ask for same engine/ trans and Ac or non Ac. You can also buy them new.
Posted via Mobile Device

**FirstOwner69** · 06-08-2013, 12:16 PM

Quote:

Originally Posted by WIDESIDE72

On my 72 c10 with a 350 a p. O. Replaced the fActory clutch fan with an aftermarket flex fan. I found a factory clutch and fan on the parts board. The spacer is part of the clutch. I don't think the 70 trucks had a clutch fan but I don't see why a 72 wouldn't work. Not sure if 71 had them or not. Just be sure to ask for same engine/ trans and Ac or non Ac. You can also buy them new.
Posted via Mobile Device

My early 69 3/4 ton with A/C (HD cooling) came new with a clutch fan. No spacer needed.

**Stocker** · 06-08-2013, 03:26 PM

My '72 K20 has an OEM clutch fan. There's a short shaft from the mounting plate to the clutch unit (all one piece)... no additional spacer.

Andrewman · 06-08-2013, 04:57 PM

Thank you, your replies have all been very helpful.

ole dollor · 06-08-2013, 06:36 PM

you should be able to get a fan and clutch off of almost any gm pickup or car and make it work i do think some fans are a little bigger than others , seams like some are 15" and some maybe 18" . as long as it does not hit the shroud, just leave off the spacer. some also have more blades than others...like 5 blade and 7 blade ...

06-08-2013, 11:51 AM	#1
Andrewman Registered User Join Date: Nov 2012 Location: San Diego, CA Posts: 2	Cooling Fan question Hello all, I have a 1970 Chevy C20 that I am slowly restoring. I would like to install a thermostatic fan clutch in place of the flex blade fan. The engine is a 350. My question is, will I need an engine fan-to-water pump spacer with a fan clutch to position the fan in the shroud correctly? Currently, there is a approx. 2.5 inch spacer on the flex fan in my truck. I am planning on ordering a 6 blade fan and standard duty thermostatic fan clutch. Any photos would be great. Thanks in advance!!! Attached Images

06-08-2013, 11:55 AM	#2
WIDESIDE72 Senior Member Join Date: Aug 2008 Location: Cedar Park, Texas Posts: 7,500	Re: Cooling Fan question On my 72 c10 with a 350 a p. O. Replaced the fActory clutch fan with an aftermarket flex fan. I found a factory clutch and fan on the parts board. The spacer is part of the clutch. I don't think the 70 trucks had a clutch fan but I don't see why a 72 wouldn't work. Not sure if 71 had them or not. Just be sure to ask for same engine/ trans and Ac or non Ac. You can also buy them new. Posted via Mobile Device

06-08-2013, 03:26 PM	#4
Stocker 20' Daredevil (Ret) Join Date: May 2003 Location: Jefferson State Posts: 13,728	Re: Cooling Fan question My '72 K20 has an OEM clutch fan. There's a short shaft from the mounting plate to the clutch unit (all one piece)... no additional spacer. __________________ - Mike - 1972 K20 LWB 350/350/205 RIP El Jay

06-08-2013, 04:57 PM	#5
Andrewman Registered User Join Date: Nov 2012 Location: San Diego, CA Posts: 2	Re: Cooling Fan question Thank you, your replies have all been very helpful.

06-08-2013, 06:36 PM	#6
ole dollor Registered User Join Date: May 2012 Location: Anton, Texas Posts: 2,364	Re: Cooling Fan question you should be able to get a fan and clutch off of almost any gm pickup or car and make it work i do think some fans are a little bigger than others , seams like some are 15" and some maybe 18" . as long as it does not hit the shroud, just leave off the spacer. some also have more blades than others...like 5 blade and 7 blade ...



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.