Coolant temperature sensor resistance values

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Jul 18, 2017 | 09:15 AM

MintFord

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From: Gray, TN

Coolant temperature sensor resistance values

I've searched everywhere and I get different answers everywhere I look. Can someone tell me the correct coolant temperature vs. resistance values for the gauge sensor on a 1972 F250? Thanks!

Jul 18, 2017 | 12:20 PM

smoky_diesel

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Joined: Sep 2007

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From: Chandler, AZ

I measure mine at 2 points:
26 ohms at 219F
315 ohms at 75F

https://www.ford-trucks.com/forums/1...l#post16654949

Jul 18, 2017 | 02:17 PM

MintFord

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From: Gray, TN

Thanks Smoky Diesel. I can't get my gauge to move off of cold at all. Cooling system is ok, no air pockets, etc. Gauge maxes out when I ground the sender wire as it should. I tried a sender from another car that I know worked, didn't help. I ohmed out both senders, plus a new one for a '72 and they check good, 275 ohms at 80 degrees down to around 20 ohms in a cup of hot water. I even ran an auxiliary ground to it while it was in the truck. I see that 1970 and newer take an identical looking, but different part number sender than '69 and back. odd considering the clusters look the same from 67-72. I wonder if my cluster is from an older truck that operates at a lower resistance.