1993 7.5 F250 Coolant Temp Gauge

Reply Subscribe

Thread Tools

Search this Thread

Feb 26, 2020 | 02:45 PM

THE_PVZ

Thread Starter

Freshman User

Joined: Feb 2020

Posts: 42

Likes: 0

1993 7.5 F250 Coolant Temp Gauge

First post here. I've been lurking as a guest for some time, but now I need some info that I cant find after a lot of searching.

My coolant temp gauge isn't working. I replaced the sensor and I tried grounding the sensor wire to the block to see if the gauge is working. When I turned the ignition on with the sensor wire grounded to the block the needle went all the way to hot so I know the gauge works fine. However after installing the new sensor and attaching the wire, the gauge doesn't move when I start the truck, not even after letting the truck idle for 10 minutes or so. I suspect that the ground associated with the coolant temp sensor is disconnected but I don't know where to look for it.

Any advice?

Feb 26, 2020 | 05:42 PM

My4Fordtrucks

Hotshot

Joined: Jun 2015

Posts: 12,761

Likes: 2,419

By grounding the wire, you checked all the wiring and the gauge. The sensor is grounded through the body of the sensor. You didn’t happen to overload the threads of the sensor with Teflon tape, did you?

Feb 26, 2020 | 07:03 PM

THE_PVZ

Thread Starter

Freshman User

Joined: Feb 2020

Posts: 42

Likes: 0

The sensor came pre-tefloned, but that makes a lot of sense. I think I’m going to back the sensor out and see if I can scrape some of the Teflon off to complete the ground.

Thanks for the response.

Feb 26, 2020 | 11:44 PM

My4Fordtrucks

Hotshot

Joined: Jun 2015

Posts: 12,761

Likes: 2,419

Did you use a Motorcraft sending unit? There are a lot of defective or sub par parts out there.

Feb 28, 2020 | 04:04 PM

THE_PVZ

Thread Starter

Freshman User

Joined: Feb 2020

Posts: 42

Likes: 0

Yeah I bought the Motocraft sensor. You were correct, the teflon got in the way of the ground. I was able to get it off of there and the gauge works fine now. Thank you for the sage advice.