| Re: Radiator cooling fan [message #366825 is a reply to message #366807] |
Thu, 16 September 2021 14:04   |
Greg C.
Messages: 224
Registered: October 2019
Location: Knoxville, TN
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During my dash rebuild, I recently installed an Autometer water temperature gauge in addition to the factory gauge. I have a 10 month old NAPA medium duty clutch fan that I wondered about as the only time I knew for sure was running was when I start the engine for the first time for the day. After the water temperature gauge was installed, I cranked the coach up and let it warm while doing some dash and air suspension checks. I have a new radiator core, all new hoses, and a new Robert Shaw 195 degree thermostat. I kind of forgot about the engine idling while I was working on things, but when I remembered and went back up front, the temperature was sitting at about 205 degrees. I decided to just watch a minute and see if it got any hotter. It was about 85 degrees outside with 60% humidity. In just a minute or so, I heard the fan kick in for the first time other than initial start up. It ran for a couple of minutes and the water temperature went all the way down to 180 degrees. That meant that the thermostat was closing again. I had checked the thermostat for proper operation on the stove top before installation. I kept watching, and the temp slowly began to rise again. So I was pretty happy to see that everything seemed to be working as it should. The clutch fan kicked in somewhere between 205-210 on the gauge. I don't know what the air temp coming past the fan sensor was, but it was probably close to that. So yours should behave similarly. I've been told that a gunked up radiator may not flow enough water to heat up the radiator fins sufficiently to engage the fan, and that may have been my problem before recoring my radiator.
Greg Crawford
KM4ZCR
Knoxville, TN
"Ruby Sue"
1977 Royale
Rear Bath
403 Engine
American Eagle Wheels
Early Version Alex Sirum Quad bags
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