| Re: [GMCnet] Fan clutch follies [message #272275 is a reply to message #272226] |
Wed, 18 February 2015 21:04   |
powwerjon
Messages: 849
Registered: March 2013
Karma:
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Senior Member |
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Armand,
I have run the new nylon fan assembly for about 2400 miles so far and I am using an AZ 2747 fan clutch. It is much quieter than the 7 blade metal fan. I run a 190 deg thermostat and a stock radiator. It sets at 190 on the dash gauge with the temp moving up and down a little bit as the thermostat opens and closes. You can hear the fan the fan engage and disengage, but nothing like the stock steel fan. You can hear the fan slightly on cold engine start and then it goes away just like the stock fan.
In the 15 years and 70000 miles that I have owned GMC’s I have never had the issues that some have described including you. I have had 2 fan clutch failures in the last 15 years. One was when it just failed to engage and the other was when it failed locked on. That was a bit noisy but I only had to go about 60 miles to get home. The best bang for the buck IMPO is the addition of a air dam spoiler on the front of the coach and side panels to direct the air flow thru the radiator. The coaches with the 403 had the air control panels from the factory, We did a lot of testing of the front air dam type spoiler back in 2002. Actual road testing was done by Arch on several trips out west during the summers of 2001 and 2002.
http://www.appliedgmc.com/prod.itml/icOid/1019
and
JR Wrights Air Spoiler Dam
J.R. Wright
30' Buskirk Stretch
Michigan
On Location in Tucson
> On Feb 18, 2015, at 9:27 AM, Armand Minnie wrote:
>
> Jerry, I don't know about the fan clutches but I am thinking there is some sort of bypass that is defeating your thermostat. I fought the battle of
> trying to figure out why the fan clutch "thought" it was time to turn on when it shouldn't and have settled on air flow in the engine compartment.
> Funneling the air through the radiator instead of around it and using a "spoiler" to pull the air out the bottom has fixed that problem in my coach. I
> use a lighter duty AZ fan clutch and the standard fan and have none of those problems even in Arizona in the Summer - I did before. By the way, make
> sure that thermostat is a "fail open" type?
> --
> Armand Minnie
> Marana, AZ
> '76 Eleganza II TZE166V103202
> http://www.minniebiz.com
> http://www.gmcws.org
>
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