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Re: [GMCnet] The stock temp gauge doesn't really tell you your operating temps. Why that's a problem [message #327792 is a reply to message #327688]

Thu, 04 January 2018 21:13

BobDunahugh

Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA

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Senior Member

Johonny. The problem s there are that the radiator should be full if the overflow tank is at it's correct level. Next. The corrosion at the top could be drastically different farther down. The radiators have drains at the bottom that is simple to open. Good thought though. Bob Dunahugh

________________________________
From: Bob Dunahugh
Sent: Tuesday, January 2, 2018 5:08 PM
To: gmclist@list.gmcnet.org
Subject: RE: The stock temp gauge doesn't really tell you your operating temps. Why that's a problem

Mike K. Thanks. I think this is more of a problem then is generally thought. I pull higher GVW's more then most. And never had any add on items installed on our 403 GMC. Radiator inspections on attendees GMC's. Might make for a good tech session at the GMCMI rally in Tucson. Line them up, and start checking with my inspection camera. Drain pan, funnel, and the camera. At a cost of FREE. Good idea, or not. Any input out there? Bob Dunahugh

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 didn'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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[Message index]

		[GMCnet] The stock temp gauge doesn't really tell you your operating temps. Why that's a problem By: BobDunahugh on Tue, 02 January 2018 11:24
		Re: [GMCnet] The stock temp gauge doesn't really tell you your operating temps. Why that's a problem By: Mike Kelley on Tue, 02 January 2018 13:49
		Re: [GMCnet] The stock temp gauge doesn't really tell you your operating temps. Why that's a problem By: BobDunahugh on Tue, 02 January 2018 17:08
		Re: [GMCnet] The stock temp gauge doesn't really tell you your operating temps. Why that's a problem By: Mike Kelley on Tue, 02 January 2018 18:27
		Re: [GMCnet] The stock temp gauge doesn't really tell you your operating temps. Why that's a problem By: thesmith on Tue, 02 January 2018 20:15
		Re: [GMCnet] The stock temp gauge doesn't really tell you your operating temps. Why that's a problem By: powwerjon on Wed, 03 January 2018 09:36
		Re: [GMCnet] The stock temp gauge doesn't really tell you your operating temps. Why that's a problem By: Keith V on Wed, 03 January 2018 09:45
		Re: [GMCnet] The stock temp gauge doesn't really tell you your operating temps. Why that's a problem By: Mike Kelley on Wed, 03 January 2018 10:28
		Re: [GMCnet] The stock temp gauge doesn't really tell you your operating temps. Why that's a problem By: Mike Kelley on Wed, 03 January 2018 10:30
		Re: [GMCnet] The stock temp gauge doesn't really tell you your operating temps. Why that's a problem By: BobDunahugh on Wed, 03 January 2018 10:43
		Re: [GMCnet] The stock temp gauge doesn't really tell you your operating temps. Why that's a problem By: emerystora on Wed, 03 January 2018 11:05
		Re: [GMCnet] The stock temp gauge doesn't really tell you your operating temps. Why that's a problem By: Mike Kelley on Wed, 03 January 2018 11:34
		Re: [GMCnet] The stock temp gauge doesn't really tell you your operating temps. Why that's a problem By: Mike Kelley on Wed, 03 January 2018 11:26
		Re: [GMCnet] The stock temp gauge doesn't really tell you your operating temps. Why that's a problem By: USAussie on Wed, 03 January 2018 13:44
		Re: [GMCnet] The stock temp gauge doesn't really tell you your operating temps. Why that's a problem By: Emery Stora on Wed, 03 January 2018 18:39
		[GMCnet] Free Radiatior internal camera inspection, with radiator/cap pressure test. By: BobDunahugh on Wed, 03 January 2018 19:28
		Re: [GMCnet] Free Radiatior internal camera inspection, with radiator/cap pressure test. By: Ken Henderson on Wed, 03 January 2018 20:04
		Re: [GMCnet] Free Radiatior internal camera inspection, with radiator/cap pressure test. By: James Hupy on Wed, 03 January 2018 20:16
		Re: [GMCnet] Free Radiatior internal camera inspection, with radiator/cap pressure test. By: bdub on Wed, 03 January 2018 21:38
		Re: [GMCnet] Free Radiatior internal camera inspection, with radiator/cap pressure test. By: Matt Colie on Thu, 04 January 2018 09:18
		Re: [GMCnet] Free Radiatior internal camera inspection, with radiator/cap pressure test. By: Ken Henderson on Thu, 04 January 2018 10:42
		Re: [GMCnet] Free Radiatior internal camera inspection, with radiator/cap pressure test. By: USAussie on Thu, 04 January 2018 05:28
		Re: [GMCnet] Free Radiatior internal camera inspection, with radiator/cap pressure test. By: BobDunahugh on Thu, 04 January 2018 12:14
		Re: [GMCnet] Clubs Posting To GMC list By: BobDunahugh on Thu, 04 January 2018 12:49
		Re: [GMCnet] The stock temp gauge doesn't really tell you your operating temps. Why that's a problem By: BobDunahugh on Thu, 04 January 2018 21:13
		[GMCnet] The stock temp gauge doesn't really tell you your operating temps. Why that's a problem By: BobDunahugh on Sat, 06 January 2018 11:28
		Re: [GMCnet] The stock temp gauge doesn't really tell you your operating temps. Why that's a problem By: jhbridges on Wed, 03 January 2018 14:16
		Re: [GMCnet] The stock temp gauge doesn't really tell you your operating temps. Why that's a problem By: jhbridges on Thu, 04 January 2018 14:59
		Re: [GMCnet] The stock temp gauge doesn't really tell you your operating temps. Why that's a problem By: Matt Colie on Fri, 05 January 2018 10:04
		Re: [GMCnet] The stock temp gauge doesn't really tell you your operating temps. Why that's a problem By: jhbridges on Sat, 06 January 2018 07:56

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