Temp gage sender - still working after disconect

chezheadsupra · 12-09-2015, 11:30 PM

I have a 87 TURBO that Ive had since new !

I have a strange problem with the TEMP sender gage on the Thermostat housing . If im not mistaken .. the sensor that returns signal to the DASH is a single metal spade that fits on a single spade on the sensor. the round blue one is for AC thermostat fan on radiator, the square green on side is for the ECU on startup and control. and the top one is the Cold start Time sensor ..

My question is this .. after burping my system after hearing this gurgling sound for years.. and having the scare of a BHG symptoms .. ( I don't !!)

I now have NO AIR in my system to cause false reading on spiked temp ( happens when gas( hot steam ) is touching thermistor and not the cooler water.... for you non -techies.

this is the puzzle :

When I disconnect connector from the sensor .. THE TEMP INDICATION REMAINS constant .. IT DOESNT FALL DOWN TO ZERO. !!

I have not started it cold w/o it connected and then connected after word. so I don't know if it works in reverse. But

If this was the sender to the gage it would read nothing .. so what's UP >>???

Is the Jedi FORCE sending a signal with no copper wire connected ??

yale · 01-02-2016, 01:35 PM

The Repair Manual wiring diagram shows the temp sensor wire leading to the gauge to be yellow with green stripe. I just confirmed that color scheme on my '87. It is the single spade connection and low on the thermostat housing.

My connection fell off last month and my gauge didn't read, so I know that wire does control the gauge in my case.

12-09-2015, 11:30 PM	#1
chezheadsupra Stock Join Date: Apr 2011 Location: dallas TX Posts: 1	Temp gage sender - still working after disconect I have a 87 TURBO that Ive had since new ! I have a strange problem with the TEMP sender gage on the Thermostat housing . If im not mistaken .. the sensor that returns signal to the DASH is a single metal spade that fits on a single spade on the sensor. the round blue one is for AC thermostat fan on radiator, the square green on side is for the ECU on startup and control. and the top one is the Cold start Time sensor .. My question is this .. after burping my system after hearing this gurgling sound for years.. and having the scare of a BHG symptoms .. ( I don't !!) I now have NO AIR in my system to cause false reading on spiked temp ( happens when gas( hot steam ) is touching thermistor and not the cooler water.... for you non -techies. this is the puzzle : When I disconnect connector from the sensor .. THE TEMP INDICATION REMAINS constant .. IT DOESNT FALL DOWN TO ZERO. !! I have not started it cold w/o it connected and then connected after word. so I don't know if it works in reverse. But If this was the sender to the gage it would read nothing .. so what's UP >>??? Is the Jedi FORCE sending a signal with no copper wire connected ??

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01-02-2016, 01:35 PM	#2
yale Intake Join Date: Oct 2015 Location: CT Posts: 38	The Repair Manual wiring diagram shows the temp sensor wire leading to the gauge to be yellow with green stripe. I just confirmed that color scheme on my '87. It is the single spade connection and low on the thermostat housing. My connection fell off last month and my gauge didn't read, so I know that wire does control the gauge in my case.