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Discussion Starter #1 (Edited)
(1989 corolla wagon carbed)
Ok I looked all over the place, I went down to the parts store and got the sensor but I cant find it! I looked all over under the distributor next to the fan switch there are only 2 sensors there the fan switch and a small sensor just above the fan switch around 11 0'clock but its tiny compared to the sensor I got from the parts store.
Can any one tell me where the engine coolant temp sensor is located?:headbang:
 

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That sensor that you call a fan switch I think is the sensor you probably bought. Just had an issue with my stepfathers fan staying on all the time, it was the coolant temp sensor/switch located on the thermostat housing........
 

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Discussion Starter #3 (Edited)
That sensor that you call a fan switch I think is the sensor you probably bought. Just had an issue with my stepfathers fan staying on all the time, it was the coolant temp sensor/switch located on the thermostat housing........
I have both I changed this one already this is the fan switch

this is the engine coolant sensor that I cant find the location have no clue where it is. its not next to the fan switch and its not on the radiator.
 

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As mentioned it is in or around the area of thermostat housing (drivers side of engine).
Follow the radiator hose up to it and you will find it. Be sure to replace the stat and flush the cooling system out and install new coolant. That probably accounts for most of the problems you are having. If the sensor you find in that area is different than the one you were sold they may have given you the wrong one.
 

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Rotary guy...
89 RX-7 Turbo
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what are you trying to fix?

I can look at my 4A-F on an engine stand later and see if I can find it or what you're supposed to be replacing.
 

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Discussion Starter #6
As mentioned it is in or around the area of thermostat housing (drivers side of engine).
Follow the radiator hose up to it and you will find it. Be sure to replace the stat and flush the cooling system out and install new coolant. That probably accounts for most of the problems you are having. If the sensor you find in that area is different than the one you were sold they may have given you the wrong one.
Ok I will check on that, the only things I see around that area are temp sending plug (this has a spade connector with only one wire), and the fan switch (round white connector) no temp sensor unless the fan switch is the temp sensor? lol this is confusing!.

what are you trying to fix?

I can look at my 4A-F on an engine stand later and see if I can find it or what you're supposed to be replacing.
Cool thanks I am trying to get rid of some codes
22-engine coolant temp sensor
31-air flow meter signal (vacuum sensor signal)
41-Throttle position sensor
 

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Discussion Starter #7
That sensor that you call a fan switch I think is the sensor you probably bought. Just had an issue with my stepfathers fan staying on all the time, it was the coolant temp sensor/switch located on the thermostat housing........
You may be right I am starting to think the fan switch sends a signal the the relay and the ECU I dont think there is a separate engine coolant sensor.
 

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Rotary guy...
89 RX-7 Turbo
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You may be right I am starting to think the fan switch sends a signal the the relay and the ECU I dont think there is a separate engine coolant sensor.
a switch is exactly that, a switch. it's either on or off, it cannot send a signal to the ECU to tell it what the temperature is.
 

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Discussion Starter #9
a switch is exactly that, a switch. it's either on or off, it cannot send a signal to the ECU to tell it what the temperature is.
Ok so back to my question than where is that freakin sensor:headbang:
 

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corolly
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Ok so back to my question than where is that freakin sensor:headbang:
follow your radiator hose to a piece of metal that will look dome shaped. that is the thermostat housing
just remember it connects to the end of one of the radiator hoses and there is only two main ones so just folllow them till you find it
 

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Let me help you out ;)



It is screwed in to the thermostat housing, on the drivers side of the engine head.



It's a bit hard to see, it's under the ignition, but as already mentioned: follow the hose to the thermostat housing and you'll find it ;)

Good luck!
 

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Discussion Starter #12
Let me help you out ;)



It is screwed in to the thermostat housing, on the drivers side of the engine head.



It's a bit hard to see, it's under the ignition, but as already mentioned: follow the hose to the thermostat housing and you'll find it ;)

Good luck!
YEA! thats it! thanks man I owe you one big time.
:thumbsup::thumbsup::thumbsup:
 

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Discussion Starter #13
So there is just the temp sender and the fan switch. The sensor they gave me must be for the EFI there is a lot of cross referencing going on at the auto parts store :D ok so I am going to install the fan switch and the sending unit and I need to go get a thermostat too thanks guys I really appreciate:chug: all your help.

Dean
 

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Discussion Starter #15 (Edited)
Oh just for future reference this is the switch that was in my 89' not the one they sold me. BUT the one they sold me fit and works perfectly and was $20.00 cheaper!
Here is a pic of the switch I took out.

This is the one they sold me
 
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