Thermostat reading hot

[Joel E.]

1970 gtx 440 6pack new temperature gauge new sending unit. When vehicle warms up gauge goes to 230 and stays between there and 250. IR shows 205 at thermostat and 160 at bottom radiator hose. For additional information oil gauge pegs at 80 and fuel gauge won't go above 3/4 all gauges and sending units are new.

Thanks for taking the time to respond.
Joel

 

[Don67Satellite]

Stock gauge? Aftermarket?

Likely wrong sender resistance.

 

[Longknife]

Voltage limiter?

 

[beanhead]

New sending units are a crapshoot unfortunately.
You can either buy another one or three (they're cheap, try to buy them from different sources) and test them, or add a resistor of the necessary value in-line with the wire.
I did the resistor trick some years ago (put it behind the dash out of sight) and it worked good but I eventually found a more accurate sender. I wanna say it was from Rock Auto but it's been awhile...good luck!

 

[threewood]

Fuel and temp are regulated through the gauge regulator. If your fuel gauge isn't showing high I would suspect the temp sender and gauge are not compatible.

 

[davek]

Fuel and temp are regulated through the gauge regulator. .

oil gauge also I believe.

 

[Don67Satellite]

I have a brand new sender for my stock dash gauge from Rock Auto that claims compatible with the car. It is not. Using a AutoMeter gauge to get the real story.

 

[Joel E.]

Stock gauge? Aftermarket?

Likely wrong sender resistance.

gauges are stock. I am thinking of replacing the limiter wondering if I should replace the circuit board also?

 

[Joel E.]

I should say that I bought a new set of gauges from classic however thee gauges operated in the same fashion before I replaced them. I have replaced the thermostat sending unit but not the oil gauge.

 

[Joel E.]

Stock gauge? Aftermarket?

Likely wrong sender resistance.

what is the cure?

 

[Don67Satellite]

what is the cure?

A NOS sender if anyone has one, *could* be the cure. I recently replaced my limiter. Like my VR, I went solid state. Available from various vendors.