This may be old news for most but doesn't hurt to be told. The original
temp. sender on all GMC Motorhomes at 1/4 is 225 degrees, 1/2 is 250
degrees, 3/4 is 270 degrees, and H is 280 degrees. This has caused a lot
of engine damage when engine starts to overheat. Go to NAPA and get a
TS-6469 sender and it will show 1/4= 180 degrees, 1/2 = 215 degrees, 3/4
= 240 degrees, and H = 255 degrees. Since the standard pressure cap
raises antifreeze solution boiling point to 250 degrees this will be
more accurate readings. I don't know why they did this but it is a
serious problem. Info from GMC Motorhome News published by Cinnabar,
Dec. '95 issue. I did this and it agrees exactly with my VIP digital
readout.
Bill Wallace - K3SVO
temp. sender on all GMC Motorhomes at 1/4 is 225 degrees, 1/2 is 250
degrees, 3/4 is 270 degrees, and H is 280 degrees. This has caused a lot
of engine damage when engine starts to overheat. Go to NAPA and get a
TS-6469 sender and it will show 1/4= 180 degrees, 1/2 = 215 degrees, 3/4
= 240 degrees, and H = 255 degrees. Since the standard pressure cap
raises antifreeze solution boiling point to 250 degrees this will be
more accurate readings. I don't know why they did this but it is a
serious problem. Info from GMC Motorhome News published by Cinnabar,
Dec. '95 issue. I did this and it agrees exactly with my VIP digital
readout.
Bill Wallace - K3SVO
