LS1 Coolant Temp
Thread Starter
Joined: Mar 2006
Posts: 21,019
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From: The Beach...
LS1 Coolant Temp What wire on a LS1 F Car does the Colant Temp Gauge get it's signal from? I have it traced in the Harness from the Sensor, but which wire actually sends the Signal to the Gauge..how is the Gauge wired?
Last edited by the_merv; May 11, 2007 at 08:07 AM.
Coolant temp sensor Hi
Just get another sensor and screw it into the plugged port at the aft end of the RH head (LS1 LH head is "swung 180" and mounted on the RH). Then wire to your guage on the dash. The port is M12x1.5
We did this on our E30-LS1 swap. We had to drill & tap the existing port in the RH head for a BMW temp sensor (9/16-18 -- I thought those guys were metric) and then ran a wire to the dash guage. The existing sensor in the LH head still goes to the PCM, with no changes. This worked for us because our sensor is a 1-wire type that gets power from the dash and completes the electrical circuit by being grounded at the RH head.
If your sensor is a 2-wire type (power from battery source, thru sensor, to guage, then from guage to ground), just wire it like that.
Steve & Garret building the 357is
Just get another sensor and screw it into the plugged port at the aft end of the RH head (LS1 LH head is "swung 180" and mounted on the RH). Then wire to your guage on the dash. The port is M12x1.5
We did this on our E30-LS1 swap. We had to drill & tap the existing port in the RH head for a BMW temp sensor (9/16-18 -- I thought those guys were metric) and then ran a wire to the dash guage. The existing sensor in the LH head still goes to the PCM, with no changes. This worked for us because our sensor is a 1-wire type that gets power from the dash and completes the electrical circuit by being grounded at the RH head.
If your sensor is a 2-wire type (power from battery source, thru sensor, to guage, then from guage to ground), just wire it like that.
Steve & Garret building the 357is
Originally Posted by the_merv
What wire on a LS1 F Car does the Colant Temp Gauge get it's signal from? I have it traced in the Harness from the Sensor, but which wire actually sends the Signal to the Gauge..how is the Gauge wired?
Anyone?
Joined: Sep 2004
Posts: 3,148
Likes: 12
From: Downers Grove, IL
The factory temp gauge is fed by the PCM via serial data. There is no single specific wire set aside for the temp gauge, it is part of the class II serial data that is sent between the cluster and PCM/BCM.
Thread Starter
Joined: Mar 2006
Posts: 21,019
Likes: 893
From: The Beach...
Yea, I got another one and put it in the right side Head, wired it in the Harness. The only problem I see there is that it gets hot back there, real hot.. anyone think that it will throw the Gauge?
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i did it, put it in the back of the passenger head and it reads 245 all the time, just below the orange...i guess since its right next to the exhaust port...the check gauges light comes on because it soo hot
Thread Starter
Joined: Mar 2006
Posts: 21,019
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From: The Beach...
That's the in-line, and why don't you think it's goin to be accurate? The way I have it, it's goin to be surrounded by Coolant, and that Coolant comes hot out of the Engine..
