Backroad_Beast

I've done some searching and so far can't find a solid answer so help would be much appreciated. My question is is it the Temp Sending unit on the side of the block or the Engine Coolant Temp sensor towards the front of the block that controls the gauge? The truck is a 91 4.9L EFI. I've seen diagrams and everything else I just need to know which one to replace to get my gauge working. Thanks for any advice.
- Kilian

ServeChilled

I had the same problem on my '89. I replaced the thermostat (which is on the block) and the coolant temp sensor, which is on a small hose that comes off the radiator and heads to the back of the engine compartment (parallels another small hose). If you pop the hood these 2 hoses should be on your left, and the sensor should be sticking up, with the electric wires running to the back of the compartment as well. It has an electric connector that just plucks right off, should see 2 metal prongs inside the plastic collar if you take off the connector. I'm sure there's a fancy name for the hose, but I can't think of it. It's a cheap part, but don't buy the wrong one (I did), make sure you unscrew the original sensor and bring it in to the auto parts store, or you end up making multiple trips like I did.

Just call me Sean

iTrader: (1)

I've answered this at least 100 times. The one on the side of the block, towards the rear.

sylver91

Looks like you need more sticky threads for stuff like that, just like how a 4spd with OD is a 5

Just call me Sean

iTrader: (1)

Backroad_Beast

Thanks ServeChilled.

Backroad_Beast

Im on my phone nowhere near a computer and the search button hasn't been working at all on the app I'm using to get on this forum. Sorry for inconveniencing you.

Just call me Sean

iTrader: (1)

I have no problem answering questions, it's the "I tried to search" BS that's annoying. You're welcome dick.

Backroad_Beast

Whatever dude, I'm not lying when I say the search button did not work on my mobile app. I tried multiple times with more subjects than just this and every single time the app crashed. Had I been near a computer I would've got on it.

JEEPTHG

Search function hasn't worked on my iPhone for over a week

But it works great on my laptop