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temp gauge mg midget displaying Hot

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pethia

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1979 MG Midget/ the temp gauge is showing hot even before the car has warmed up.
1. changed all antifreeze (old stuff was clean)
2. replaced thermostat and gasket
the gas gauge works which I thing would rule out a bad voltage stabilizer.

I have ordered a new temp sender for the thermostat housing. Any thoughts here appreciated.
 
[ QUOTE ]

I have ordered a new temp sender for the thermostat housing. Any thoughts here appreciated.

[/ QUOTE ]
Sometimes, if I'm really curious, I'll check the sending unit in a pan of water on the stove.
Use a candy thermometer and check the ohms.....
Someone here may know the range.

BTW.....Welcome to BCF /ubbthreads/images/graemlins/savewave.gif
 
A "fly-by-night" test of the gauge can be done by:

1)disconnect it from the sender and be sure it stays "bottomed out"

2) ground the sender wire and the gauge should go "full scale".

If those two things occur it's almost a certainty you've a faulty sender.
 
Sounds exactly like what my sender did when it went bad right after a coolant change. Went directly to hot even with the engine off and cold. New sender and everything went back to normal.
 
Putting the sensor in a pan of boiling water with one extension wire going from the top of the sensor to the hookup wire and another wrapped around the sensor and going to ground will (when the ignition is turned on) tell you a bit about the condition of the sensor. If you put a thermometer in the water as it cools and compare it to the gauge in the car this will tell you a LOT about the sensor.
Bill
 
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