| [GMCnet] Electric fan in front of radiator [message #340081] |
Sat, 12 January 2019 12:05  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
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Senior Member |
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Ken. I see a fan in front of the radiator in your photos. I've thought of doing something like that. So I could turn a fan on when having the engine off at gas/other stops. Even pulling the heavy loads that I do. I've never had cooling issues. But then again. The 403's have better air ducting for the engine. Bob Dunahugh 78 Royale
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| Re: [GMCnet] Electric fan in front of radiator [message #340082 is a reply to message #340081] |
Sat, 12 January 2019 12:32  |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Bob,
Yes, I've had electric fans for years, starting back with the OEM auxiliary
fan on a '84 Class A (brand forgotten) with a 454, which would overheat at
low speeds without the electric fan running. I used it occasionally back
in the 455 days with an OEM radiator. Since the Cad500 demanded an
aluminum radiator, regardless of electric fans, I don't recall having ever
turned them on (they're only manually controlled). You may have noticed
that they're low on the radiator, in front of the external oil cooler --
intentionally.
What probably can't be seen in any photo is the fact that I also have
complete ducting of air from the grille to the radiator -- far more
thorough than any GMC OEM setup. That may help more than the fans could.
It's worth noting that the Chevrolet P30 Chassis Owner's manual (available
at bdub.net) specifically admonishes RV builders to be sure that engine
compartment air cannot recirculate to the front of the radiator -- EVERY
original GMC basically ignores that engineering guideline.
Ken H.
On Sat, Jan 12, 2019 at 1:06 PM Bob Dunahugh wrote:
> Ken. I see a fan in front of the radiator in your photos. I've thought of
> doing something like that. So I could turn a fan on when having the engine
> off at gas/other stops. Even pulling the heavy loads that I do. I've never
> had cooling issues. But then again. The 403's have better air ducting for
> the engine. Bob Dunahugh 78 Royale
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Electric fan in front of radiator [message #340093 is a reply to message #340082] |
Sun, 13 January 2019 20:57 |
tphipps
Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL
Karma: 9
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Senior Member |
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Bob, My first GMC had an axial blower in the engine compartment. It was activated by a set of relays and thermostats to turn on when engine was off and the compartment was still warm from running down the road. Exhausted via side vents in the driver side wheel well.
Really surprised me when it came on while I was refueling the coach.
I changed over to dash switch for control. When it was turned on, you could watch the temp gauge move as the hot air was evacuated.
If I was to do this now, I would use an Ardino for control, with temp and flame sensors.
Tom
2012 Phoenix Cruiser model 2552
KA4CSG
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