The sensor unit will be located at or near the thermostat and will be just the one wire. If the gauge is working then by shorting out the wire at the sender unit the needle will immediately go to hot. IN tis case replace the sender unit. This is done with the ignition on. If there is no movement it may ne the wire or a bad gauge. Mostly though it is the sender unit.
The dashboard gauge is not working.
The needle is on cold. If I knew where the sensor was I could trace some wires. I probable need a photo as Im not sure where the thermostat is even....
Your clues helped me out! I found the therostat housing and found the sensor, minus an attached wire. I little hunting around and I found the wire which must have been disconnected by the mechanic when he regassed the air con grrrrrr. Problem solved. Cheers!
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