North American Turbocoupe Organization



Automatic Climate control
blackbird87 Offline
Member
#1
The in-car temp. sensor is dead on my car. The part is not to be found. ACT code is 12. I checked the sensor and it has 0 resistance. Has anyone used a sensor from another vehicle? If I knew the operating voltage of the sensor it would help. If I have to I will find the proper thermistor and repair mine. All imput is welcome. Thanks.
1988 Turbo Coupe 5spd stock. 1987 Turbocoupe 5spd,Totalled.
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TurboCoupe50 Offline
Posting Freak
#2
The sensor should read 35K ohm at 0*F and drop to around 4300 ohms at 120*F... At 80*F it should read 9500 ohms...

BTW there is a chart in the shop manual with readings...
1988 Turbo Coupe331 AOD

1972 Comet GT

1969 Fairlane Cobra 428CJ 4-Speed
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blackbird87 Offline
Member
#3
Thanks. I have the the shop manual and knew the range. Just not the operating voltage. I will check it with a meter when I get back to the car.The thermisters I am finding in that range are milivolt rated. Thanks again.
1988 Turbo Coupe 5spd stock. 1987 Turbocoupe 5spd,Totalled.
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TurboCoupe50 Offline
Posting Freak
#4
I doubt voltage or amperage is much of a concern, no doubt there is almost no current draw... Whatever I found that was close in resistance would get the nod...
1988 Turbo Coupe331 AOD

1972 Comet GT

1969 Fairlane Cobra 428CJ 4-Speed
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blackbird87 Offline
Member
#5
Rebuilt the thermister for in car temp. The voltage was 5v. Cleaned ambient sensor. The auto function works now. Within one degree of my digital temp gauge. Total cost $5.20. Thanks for all the help.
1988 Turbo Coupe 5spd stock. 1987 Turbocoupe 5spd,Totalled.
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spittinfire Offline
Member
#6
I know I'm reviving and old thread but I'm curious how one would rebuild the temp sensor inside the car? I'm trying to get my ATC to work so I'll have more than just full hot or full cold.
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anasazi4st Offline
Senior Member
#7
(12-22-2023, 06:47 PM)spittinfire Wrote: I know I'm reviving and old thread but I'm curious how one would rebuild the temp sensor inside the car?  I'm trying to get my ATC to work so I'll have more than just full hot or full cold.

This is a 10 year old thread, I haven’t seen either of these two individuals on here in some time, although they might just be lurking now—so you likely won’t get any answers from them. Jeff K. is the electronics wizard here (well, there are several), perhaps he can help with your question.

One thing you might try is the website and application car-part.com (click HERE). It’s a database across the US and I think Canada of salvage yards. You put in what you are looking for and listings appear of yards that have that particular item. I would think you could also use Mustang, Cougar or Continental parts as well, they should be interchangeable—at least, applicable Mustang ones.

Of course, the first step is to figure out exactly what it is you need.
Another proud dues-paying member.

1987 Turbo Coupe w/T5OD, 8.8 axle, grey smoke; most options. Got it in 1991 with 41K miles: 3 turbos, 2 heater cores, 3 T5OD full rebuilds, 6 clutches, 1 head gasket, 2 Teves II ABS units, etc. later....
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spittinfire Offline
Member
#8
This turned out to be somewhat easier then I had planned. So I knew a mouse had been in there before I got the car and I did my best to clean it out without taking the heater core out. I had the time so I decided to pull the entire heater box. The real problem for me was that the junk the mouse used to make it's next in there was blocking the tube that runs draws air to tell the ATC what the temperature of the air is. Clearing that seems to have fixed my problem. It's not as sensitive as newer cars but it works now and I can get a decent blend of temperature manually rather then just HOT or COLD.
While I was in there I put a heater core in which it appears that I got lucky there because might showed signs of starting to weep a little so I was on borrowed time.

Semi related, I bought a new evaporator core to put in it while I was there too but after cutting the top of the box to get the core out I found that the replacement was too wide and too tall. Apparently finding an evaporator core for these cars, including Fox Mustangs, has become a real challenge.
Mine didn't leak but was packed full of mouse nesting material so I ended up soaking it in hot bleach water for a while. After I got the worst of it out I used foam coil cleaner, the stuff you get a Lowes, and gave it a few rounds of that. It ended up clean and all the fins were clear so I should be OK with it.

I did a number of other small things while I was in there to prepare for some other plans I have for the future. It was a lot of work but I think it was worth it.
Mikey97D likes this post
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88chickentc Offline
Member
#9
Something very similar happened to me.  Mice built a nest in the box, bought an evaporator from Rock Auto, but it was too big.  I sent my old evaporator to Classic Auto Air for pressure test and rework after.  It cost me money, but I have the assurance that the piece is good.  I just have three more years of work before I get the chicken running again.

(01-02-2024, 01:18 PM)spittinfire Wrote: This turned out to be somewhat easier then I had planned.  So I knew a mouse had been in there before I got the car and I did my best to clean it out without taking the heater core out.  I had the time so I decided to pull the entire heater box.  The real problem for me was that the junk the mouse used to make it's next in there was blocking the tube that runs draws air to tell the ATC what the temperature of the air is.  Clearing that seems to have fixed my problem.  It's not as sensitive as newer cars but it works now and I can get a decent blend of temperature manually rather then just HOT or COLD. 
While I was in there I put a heater core in which it appears that I got lucky there because might showed signs of starting to weep a little so I was on borrowed time. 

Semi related, I bought a new evaporator core to put in it while I was there too but after cutting the top of the box to get the core out I found that the replacement was too wide and too tall.  Apparently finding an evaporator core for these cars, including Fox Mustangs, has become a real challenge. 
Mine didn't leak but was packed full of mouse nesting material so I ended up soaking it in hot bleach water for a while.  After I got the worst of it out I used foam coil cleaner, the stuff you get a Lowes, and gave it a few rounds of that.  It ended up clean and all the fins were clear so I should be OK with it. 

I did a number of other small things while I was in there to prepare for some other plans I have for the future.  It was a lot of work but I think it was worth it.
1931 Deluxe Coupe
1949 Club Coupe
1951 F-1
1971 Torino GT Convertible
1988 Thunderbird Turbocoupe--SC-50 turbo, 3" Motion Dynamics exhaust
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anasazi4st Offline
Senior Member
#10
(01-07-2024, 12:57 AM)88chickentc Wrote: Something very similar happened to me.  Mice built a nest in the box, bought an evaporator from Rock Auto, but it was too big.  I sent my old evaporator to Classic Auto Air for pressure test and rework after.  It cost me money, but I have the assurance that the piece is good.  I just have three more years of work before I get the chicken running again.

Three more years of work? How did you arrive at that timeframe? Do you mean, based on the amount of time you have to work on it, maybe considering the climate you live in and your schedule?

I’m just curious, not being judgmental. Perhaps your reasoning could be well-considered knowledge for the rest of us.
Another proud dues-paying member.

1987 Turbo Coupe w/T5OD, 8.8 axle, grey smoke; most options. Got it in 1991 with 41K miles: 3 turbos, 2 heater cores, 3 T5OD full rebuilds, 6 clutches, 1 head gasket, 2 Teves II ABS units, etc. later....
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