1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

Coolant Temp Switch on aftermarket radiator

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Old 07-15-22, 10:26 AM
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Coolant Temp Switch on aftermarket radiator

Has anyone tried putting the stock coolant temp switch (the one on the bottom of the driver side of the stock road)? I am installing a new Koyo radiator but I'm noticing that the bung that it screws into is recessed such that it doesn't seal. If I can't use the stock sensor, how is this going to effect the car itself and it's drivability?

Thanks in advance
Old 07-15-22, 02:00 PM
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That particular sensor matters only in terms of operation of the air injection (smog) system. I posted details about it in a comment here (referred to as "sensor #2) if you want more detail on what it does, specifically.
Old 07-15-22, 02:22 PM
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Originally Posted by mR.dnA
That particular sensor matters only in terms of operation of the air injection (smog) system. I posted details about it in a comment here (referred to as "sensor #2) if you want more detail on what it does, specifically.
So after reading through that and the FSM, it seems like I can just leave it out since I won't be using the car in temps under 60F. Do I have that right? Thanks for the reply, really helped understand the vast systems the rats nests holds haha.
Old 07-15-22, 03:07 PM
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Yes, that's correct - driveability-wise you won't have any issues.

If you really wanted to be a stickler, put a jumper in the connector so that it always indicates "above ~60F" to the ECU (which will ignore that sensor completely once the engine is >158F anyways).
Old 07-15-22, 04:28 PM
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Originally Posted by mR.dnA
Yes, that's correct - driveability-wise you won't have any issues.

If you really wanted to be a stickler, put a jumper in the connector so that it always indicates "above ~60F" to the ECU (which will ignore that sensor completely once the engine is >158F anyways).
Thank you for the help, I can't wait to get the car back on the road finally.
Old 07-15-22, 04:53 PM
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Deleted post - missread OP.

Last edited by Maxwedge; 07-15-22 at 04:56 PM.
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