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1967 - 1972 F-100 & Larger F-Series Trucks Discuss the Bumpsides Ford Truck

False overheating

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Old Aug 12, 2014 | 01:38 AM
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False overheating

I saw a thread here not to long ago about a guy who was having a false reading that his truck was overheating. The gauge would climb but the engine wasn't actually hot. Somebody mentioned that the voltage regulator for the gauges could be going bad.

Anyway, I think I might be having the same problem now. I'm not sure what the cause is yet. But if So, where is this voltage regulator and how do I go about testing it?
 
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Old Aug 12, 2014 | 05:13 AM
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What symptoms are you having?


John
 
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Old Aug 12, 2014 | 08:47 AM
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Temp guage is reading warmer than usual. But engine is fine.
 
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Old Aug 12, 2014 | 04:35 PM
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Have you considered a manual read or non-electric gauge? As long as it's not boiling over let it run.



John
 
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Old Aug 12, 2014 | 04:52 PM
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Is your fuel gauge working correctly? The IVR covers both gauges. Do you have access to an infra red thermometer?
 
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Old Aug 12, 2014 | 06:01 PM
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Originally Posted by JEFFFAFA
Is your fuel gauge working correctly? The IVR covers both gauges. Do you have access to an infra red thermometer?
Kind of, and yes
 
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Old Aug 12, 2014 | 07:28 PM
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Right now I'm kind of suspecting a sticking thermostat. Temperature fluctuates between 200-210. But never gets any hotter.
 
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Old Aug 12, 2014 | 07:29 PM
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IVR part number for 71/72 Bumps was D1AZ10804A. Mounted on the back of the cluster. You want me to run it on the Ford locator or you gonna buy one where you used to work?
 
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Old Aug 12, 2014 | 07:37 PM
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I'll find one if I nail down that thats what it is. At first I thought so but I've measured engine temp a few different times now and it is actually running warmer.

It seems very odd that it starts doing this right after the tranny install. But the trans is always right at about 180. I don't know what's going on. It's just bugging me.
 
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Old Aug 13, 2014 | 08:02 PM
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Haha, false alarm guys. I figured out what was happening. When I swapped the tranny I forgot to hook the ground strap back up. The one that goes from the firewall to the bellhousing.

So it was my fault...
 
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Old Aug 14, 2014 | 03:53 AM
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Originally Posted by 351Cleveland C4
Haha, false alarm guys. I figured out what was happening. When I swapped the tranny I forgot to hook the ground strap back up. The one that goes from the firewall to the bellhousing.

So it was my fault...
Imagine that.


John
 
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Old Aug 14, 2014 | 09:11 AM
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My temperature gauge would always warm up with the engine and then peg a hard right indicating an overheating issue. I don't remember seeing a ground strap when I pulled the transmission, or now that the front clip is off. Maybe I had the same issue?
 
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Old Aug 14, 2014 | 09:16 AM
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Possible. The strap in talking about goes from one of the upper bellhousing bolts to the firewall right behind it. Just an open/bare wire strap. If there wasn't one there, I'd recommend installing one. Even though the truck works without it, it does these kinda things.
 
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Old Aug 14, 2014 | 09:17 AM
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I'mm have to give a quick look to see if that strap even exists.
 
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Old Aug 14, 2014 | 12:49 PM
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Originally Posted by trozei
I'mm have to give a quick look to see if that strap even exists.
69/72...F100/F350...6 and 8 cyl....D1PZ14431A...universal cable...15" long...6 gauge..."used as dash to engine ground cable".
 
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