Re: OEM temp gauge readings [message #357740 is a reply to message #357738] |
Sun, 16 August 2020 10:59 ![Go to previous message Go to previous message](/GMCforum/theme/default/images/up.png) ![Go to next message Go to previous message](/GMCforum/theme/default/images/down.png) |
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Matt Colie
![United States United States](/GMCforum/images/flags/us.png) Messages: 8547 Registered: March 2007 Location: S.E. Michigan
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lw8000 wrote on Sun, 16 August 2020 11:11Hello 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 - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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