I am having problems with the temp guage in my 89 gta. When I turn the key to on it goes to full 260 and then drops back and won't give me any reading. My headers melted the fan switch socket and that was when the problem started. My question is were does the temp guage get it's reading from?

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89 GTA w/700r4w/stage 2 shift kit,2800 converter, corvette servo, B&M mega shifter, TPIS bigmouth intake, TPIS large tube runners, TPIS 52mm throttle body, Ported Edelbrock centerbolt heads,Accell 30# injectors,holly afpr,GMPP LT4 hotcam,CompCams Pro magnum roller rockers,Edelbrock headers, flowmaster crossflow muffler,MSD 6A, accell coil,150 shot NOS. The new engine is in but I am still having some small problems.

 

Coolant temperature gauge sender is screwed into the driver's side head between the #1 and #3 cylinders.

 

Ok I have a mechanical gauge there and I didn't put it there. Does that wire from the coolent temp sensor go from the guage strait to the sensor or does it go to the ecm then to the guage? I don't know were the wire is it is not present in the engine compartment. So I will need to trace it from it's source.

[This message has been edited by poncho9789 (edited November 21, 2001).]

[This message has been edited by poncho9789 (edited November 21, 2001).]

 

You have 3 coolant temp sensors: one in the pass side head, that turns on the fan; one in the water outlet above the thermostat, that one is for the ECM; and the one for the gauge, in the driver's side head. The wire for it is green and comes from the harness between the TB and the left valve cover.

It's supposed to go to full scale when the key is in start, so that part is doing right. Your sending unit is just disconnected. It should work when you find the wire and hook it back up.

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