Temperature gauge

gmartian

New Member
Dec 7, 2020
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Seekonk
I have a 1986 GT and for some reason in roughly 5-7 minutes, it already reads hot. The infrared gun will read 185 the absolute highest and thats on the thermostat housing itself. Both hoses read 170ish. I have installed a new temp sensor, and now im trying to install an autometer gauge, but it reads 240 in accessory and 250 off cold start... lost on what to do here.

Heater core bypassed
SVE 3 row aluminum radiator
Water pump is only 6 months old
Smog pump removed
 
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John Dirks Jr

there is enough sticking out to grab on to
5 Year Member
Jun 28, 2013
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Are you able to check the voltage signal going to the gauge? I thought maybe if it's low, the condition would trick the gauge into thinking the engine is hotter than it really is.
 

2000xp8

SN Certified Technician
Aug 8, 2003
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I'm assuming you bought a electric autometer as opposed to a mechanical?
 

Mustang5L5

Put lubricant all over the balls
Mod Dude
Feb 18, 2001
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Here’s the wiring diagram for 1986 only. Do you have any issues with the fuel and oil pressure guage?

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