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What is this sensor and part number...

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86-95 Trucks & 4Runners 2nd/3rd gen pickups, and 1st/2nd gen 4Runners with IFS

What is this sensor and part number...

Old 01-13-2019, 04:30 PM
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What is this sensor and part number...

i have a 1994 toyota pick up 4x4 withan automatic transmission and a 3.0 motor, my ac compressor will stop working. Sometimes when i wiggle the connector the compressor will kick back on, it no longer works when i wiggle the connector. I jumped the compressor and it works so the problem is either the conmector or the sensor. I took the connector apart and soldered and epoxied the connector bak. I cant find what exactly this sensor is called, and if anyone knows where to purchase another one let me know. Ive been having this problem and tried to track it down for months. It has one wire going to it. Black. Or a dark color with a white stripe. It is locatd at the back of thhe motor on the water bypass






Last edited by Hmgoy; 01-13-2019 at 04:32 PM.
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Old 01-13-2019, 05:19 PM
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Old 01-13-2019, 07:36 PM
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It's an "Engine Coolant Temp Switch," but that doesn't help much because you have more than one coolant sensor.



My best guess is that it is 89428-89101 https://parts.lakelandtoyota.com/p/_...942889101.html The part has been discontinued by Toyota, but shows up in various secondary markets. https://www.ebay.co.uk/itm/7-5247-FA...-/401642095362

That sensor is found only in Automatics with 4wd; if the coolant gets too warm, it shuts off the A/C. http://web.archive.org/web/201102052.../2aircondi.pdf It connects to a relay mounted on the air box.

If you don't spend a lot of time grinding up hills in the baking heat with the A/C on, you might be able to get away with bypassing the sensor by grounding the wire. That will hold the relay closed and the A/C will work. Not the right solution, but may be the one you need to consider.
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Old 01-14-2019, 05:17 AM
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I live in arizona,,,,, and do drive in mountiats a bit . Lol is there a way to test to see if its the sensor. I did a continuity test on the connector ti did fine , just wondering why it would work sometimes when i wiggled the wire that seems pretty solid , no wiggle room
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Old 01-14-2019, 06:59 AM
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99% of the time, "wiggle to work" means a problem with the connector or wire, not the sensor. But you also need to rule out coincidence; maybe the A/C Amplifier just commanded compressor-on at the same time you were reaching for the connector.

Testing the sensor is pretty simple. As I read the schematic, the sensor is normally-closed, so just use your ohmmeter (be sure to wiggle, in case the sensor is cracked internally). You could also wire it up and drop it into boiling water to see if it is opening at a too-low temperature. Finally, you could wire in your ohmmeter, stick the meter in the cab, and drive around.
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