| [GMCnet] The stock temp gauge doesn't really tell you your operating temps. Why that's a problem [message #327671] |
Tue, 02 January 2018 11:24  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
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Senior Member |
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Our first 78 Royale came with a Digi panel. I knew my engine temps under all conditions. Then the fire. Bought another 78 Royale. But the Digi panel wasn't being made at that time. Both GMC stock temp gauges read the same. But it didn't take long before I had a feeling that this second Royale was running hotter. No boil overs. Just did't feel right. So on our next trip. I raise the engine cover several times to check the engine temp sender with an inferred temp reader. Found that this Royale was generally operating about 10 degrees hotter with the stock gauge reading in the normal range as compared to our first GMC. Jim at Applied GMC had started producing the Digi panel. And had them at the GMCMI rally that we were going too. Installed the Digi panel at the rally. On the way home the panel also confirmed what I thought. So why the running hotter? Checked the thermostat. It was a good operating 180. But I changed to a proper 195. Fan clutch? Maybe. Well Jim K at Applied started selling a fan clutch that is controlled by engine block sensors. I liked the idea that this system is more proactive in controlling engine heat buildup. Plus I can turn the clutch on for the fan by a dash mounted switch when I want. So I bought that fan clutch at the GMCMI rally. I had recently put on an aluminum 307 Olds intake manifold. So I knew the engine was clean inside. Did the engine have a car water pump? Don't know. But even if there's a car pump. That's not the real big problem. Next I drained the radiator. Put my inspection camera in the radiator. Radiator's my problem. Looked heavily corroded at the crossover tubes. Going to put the radiator from the burned GMC in soon. Probably check/change water pump anyway while I'm doing other work in that area. Installing more gauges to look at isn't the best idea in my opinion. One. I want to be looking at the road for safe driving. Two.The Digi panel has gages. But it's audible alarm is your best engine/trans protection.
Bob Dunahugh 78 Royale
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