One temp gauge reads higher than the other - both in intake.

[450bench]

I’ve got 2 temp gauges on my car. One in the back of the intake and one in the front. Front reads 10-15 degrees cooler than the other. Wtf ? Any ideas?

 

[1980RS]

That's pretty much normal on a gen IV BBC. Gm fixed that with the gen V and gen VI blocks and heads.

 

[450bench]

Should I split the difference? Lol

 

[CorkyE]

Old saying; Man with one gauge always right, man with two gauges always wrong.

 

[ZZ430]

That's the Air-Gap manifold right?

I tried using a gauge on the front and a sensor for electric fans in that rear port. It didn't work. It's the manifold design. Looking at the port it sure looked like it would. It would be interesting to try switching them for a test.



I'm thinking yours is the same.

 

[76z28]

Water is pretty stagnant at that port in the back(it isn't flowing like it is in the front). I think they put those ports in the rear for a cross over to alleviate that "issue"

 

[450bench]

Geez. You guys are right and I should have thought of that. Thanks very much, great point.

 

[Chevyforever]

450bench, that is a really nice and tidy looking little Vega you've got there. Put another temp gauge in the cyl. head and you will have a 3rd temp reading , Hah ha

 

[mallard]

If the sending units are the same thread size you could switch the units to see if the gauge readings change. If they do not either the gauges are faulty (I would think it’s unlikely that both would be defective at the same time) or you truly have two different operating temps. Now whether that’s a thing or not will depend on if you have any other symptoms going on. I’m guessing not.