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Re: [GMCnet] OEM temp gauge readings [message #357743 is a reply to message #357740] Sun, 16 August 2020 11:13 Go to previous messageGo to previous message
James Hupy is currently offline  James Hupy   United States
Messages: 6806
Registered: May 2010
Karma:
Senior Member
One person's idea of overheated coolant, is another person's idea of proper
operating temperature. 241° degrees farenheit is DEFINITELY overheated,
where 205° might be considered "Normal". 165° - 180° might be considered
not fully warmed up by others. The correct temperature is that temperature
at which all of the air/fuel mixture possible is controlled burned with no
preignition or detonation. Just sayin'
Jim Hupy
Salem, Oregon

On Sun, Aug 16, 2020, 9:01 AM Matt Colie via Gmclist <
gmclist@list.gmcnet.org> wrote:

> lw8000 wrote on Sun, 16 August 2020 11:11
>> Hello all:
>> Not too long ago our fan clutch completely locked up and we needed a
> replacement. I am not entirely sure which clutch it had. We ended up
> putting
>> on an AC Delco 15-4947 after reading on it here, there was a thread by
> Ken Burton where he did some research and found this seemed to be the best
>> replacement regarding the specs of the fan and setup on the GMC, and
> also after reading success and failures of Hayden clutches here too.
>>
>> I haven't put many miles on the coach with this new clutch but this past
> week we were in temps up to about 88 degrees out. (In MI, that's what we
>> call HOT :) ). With the old clutch in this temp range , the needle
> would barely pass the quarter mark on the gauge, but it would also kick in
> quite
>> often even on the highway and I'd hear the fan. Now, with the 15-4947
> clutch, I noticed the gauge has gone as high as just between the quarter and
>> half mark while on the highway, and I never hear the fan roar like the
> old one. But, when getting off the highway or slowing to 55 MPH or so, the
>> needle settles back to the quarter mark.
>>
>> I believe I've read that once it hits the half mark on the gauge, it's
> already overheating. Should I be concerned with the readings I'm getting?
>>
>> Thanks in advance as always!
>> Chris
>
> Chris,
>
> Assuming that the coach still has the factory temperature sensor, then
> yes, half scale is a worry. The other problem with the long standard
> thermostatic fan clutch is that it has little or no relation to the actual
> coolant temperature. There is also the issue that most of those clutches
> are now produced off-shore and the calibration is problematic at best.
>
> Do you own an IR temperature gun? If not, grab one on sale for ~20$us and
> measure the temperature at the thermostat housing.
>
> Matt
> --
> Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
> Electronically Controlled Quiet Engine Cooling Fan
> OE Rear Drum Brakes with Applied Control Arms
> SE Michigan - Twixt A2 and Detroit
>
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