Actual Coolant Temp - Team Camaro Tech
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post #1 of 6 (permalink) Old Aug 31st, 19, 05:49 PM Thread Starter
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Actual Coolant Temp

I checked the upper radiator neck with an infrared heat gun today when I got back from a show. I put the lazer where the red dot is on the attached picture. My thinking is, the coolant is leaving the engine and passing through the upper neck of the radiator. The upper neck certainly would have to stabilize at the same degree as the coolant passing through it. The heat gun was showing 195į on the neck. Is this the best place to check temp with the gun? My temp sender is in the factory location (DS cylinder head) and very close to my header. So I don't think that is a good place to take a reading. Any opinions or suggestions?
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post #2 of 6 (permalink) Old Aug 31st, 19, 07:05 PM
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Re: Actual Coolant Temp

There or the thermostat housing.

I've only had marginal luck with the infrared heat guns unless you pay a mint for them.
Cheap ones seem to be all over the place with respect to accuracy.
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post #3 of 6 (permalink) Old Aug 31st, 19, 07:42 PM
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Re: Actual Coolant Temp

I shoot the upper hose right after the housing, then shoot the lower hose out of the radiator. My cheap gun from HF works pretty well.

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post #4 of 6 (permalink) Old Aug 31st, 19, 07:47 PM Thread Starter
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I used a Fluke 572-2 IR gun. Long way from being cheap. LOL
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post #5 of 6 (permalink) Old Sep 3rd, 19, 08:20 AM
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Re: Actual Coolant Temp

Fluke makes a good product, I use FLIR gun.
T-stat housing is going to include block heat AND whatever gun mfg'r you use, it's ONLY measuring surface temp.
If fluid temp is requested, the probe MUST BE immersed in the fluid.
SO you take a length of 1.5 inch OD tubing, weld on a block of steel, drill & tap for the probe threads and place the tubing in the upper hose.
Now it will show fluid temp when t-stat opens.
You can use the cyl head spots and they are pretty good, I used the OE drvr side for the light and used pass side for the add-on temp gauge.
But observe the probe-to-depth in head as the probe may bottom out against head then you will be reading block temp.
Or too many adapters and still read cyl head material temp. You want as much probe into the fluid as possibly can get, one adapter, not two.

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post #6 of 6 (permalink) Old Sep 3rd, 19, 02:57 PM
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Re: Actual Coolant Temp

Just got my engine put back in from a rebuild. I already had my gauge probe in the manifold (near t-stat housing) and needed another for the new electric fan switch. Builder said best place is driver side head port.

Observations after less than 10 miles:
Cold Case integrated fan temp probe is supposed to engage at 190*. Fan seems to be firing up between 165*-175* according to the gauge.

Temperatures taken from head port are warmer than near the thermostat housing.

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