Temperature gauge not working

JACOB LOCKLIN

MEMBER
2002 FORD RANGER
3.0L
V6
2WD
AUTOMATIC
206,000 MILES

Installed new thermostat, housing, temperature sending unit, water pump, all hoses, radiator. Temperature gauge is not registering whatsoever. Gauge reads below cool. Mechanic noticed some dirty water in the block and that the bottom hose and the radiator was running cooler than the top hose. He suggested an engine flush. Why is the temperature gauge still not working?

2 Replies

CJ MEDEVAC

MECHANIC
11,004 POSTS

This might be easy.

Maybe the gauge is bad?

Maybe the sender is disconnected?

Maybe you changed the wrong thing?

Please see the picture I took so long to make below!

Return with good news!

The Medic

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Monday, January 21st, 2019 AT 7:08 PM

KEN L

MASTER CERTIFIED MECHANIC
43,057 POSTS

If I can add on here, let's check the connection between the sensor and the PCM and instrument cluster. here is a guide that will help you and the wiring diagrams so you can see how the system works:

https://www.2carpros.com/articles/how-to-check-wiring

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.

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