Air Temp Sensor
Thread Starter
Supporting Vendor
Joined: Sep 2007
Posts: 11,216
Likes: 178
From: Pensacola Florida GO GATORS!!! www.rlsebring.com www.c6c7vette.com
St. Jude Donor '17
Air Temp Sensor
Sorry to have to ask but the search isn't working for me now.
My HVAC readout has been on 69 F for months. I replaced the air temp sensor once and that did not cure the problem. The Ac and heater have worked fine with no problems. I am prepping the car for sale and can not stand to have something not work properly. Today I bought another air temp sensor thinking the last one might have been bad. I plugged it in and now the LED reads -35 F I hate that worst than 69 F and now the A/C won't come on. It's a balmy 70 and I may have a buyer coming.
Do you think it may be the wiring or is there something else in the system that will affect the readout?
Thanks for your help and again I apologize for asking instead of being able to search for it.
My HVAC readout has been on 69 F for months. I replaced the air temp sensor once and that did not cure the problem. The Ac and heater have worked fine with no problems. I am prepping the car for sale and can not stand to have something not work properly. Today I bought another air temp sensor thinking the last one might have been bad. I plugged it in and now the LED reads -35 F I hate that worst than 69 F and now the A/C won't come on. It's a balmy 70 and I may have a buyer coming.
Do you think it may be the wiring or is there something else in the system that will affect the readout?
Thanks for your help and again I apologize for asking instead of being able to search for it.
Tech Contributor
Joined: Jan 2007
Posts: 19,465
Likes: 1,166
From: Dyer, IN
Sorry to have to ask but the search isn't working for me now.
My HVAC readout has been on 69 F for months. I replaced the air temp sensor once and that did not cure the problem. The Ac and heater have worked fine with no problems. I am prepping the car for sale and can not stand to have something not work properly. Today I bought another air temp sensor thinking the last one might have been bad. I plugged it in and now the LED reads -35 F I hate that worst than 69 F and now the A/C won't come on. It's a balmy 70 and I may have a buyer coming.
Do you think it may be the wiring or is there something else in the system that will affect the readout?
Thanks for your help and again I apologize for asking instead of being able to search for it.
My HVAC readout has been on 69 F for months. I replaced the air temp sensor once and that did not cure the problem. The Ac and heater have worked fine with no problems. I am prepping the car for sale and can not stand to have something not work properly. Today I bought another air temp sensor thinking the last one might have been bad. I plugged it in and now the LED reads -35 F I hate that worst than 69 F and now the A/C won't come on. It's a balmy 70 and I may have a buyer coming.
Do you think it may be the wiring or is there something else in the system that will affect the readout?
Thanks for your help and again I apologize for asking instead of being able to search for it.
In short, with the a/c on you should have:
pin A - 5 volts
pin B - Ground (make note of the resistance value)
Bench testing the sensor....it ranges from 242K ohms at -40 degrees F to 2K ohms at 140 degrees F.
Thread Starter
Supporting Vendor
Joined: Sep 2007
Posts: 11,216
Likes: 178
From: Pensacola Florida GO GATORS!!! www.rlsebring.com www.c6c7vette.com
St. Jude Donor '17
Thanks for the info...
I am getting 997 it's about 60 F
215 on the ground and 5.15 v on pin A with the HVAC on but no A/C compressor
I am getting 997 it's about 60 F
215 on the ground and 5.15 v on pin A with the HVAC on but no A/C compressor
Checked anything with a DMM? It's just a thermistor, and you can bench test it to make sure the resistance value is consistent with the ambient temp. You may have a high resistance ground at the connector.....check it with a DMM.
In short, with the a/c on you should have:
pin A - 5 volts
pin B - Ground (make note of the resistance value)
Bench testing the sensor....it ranges from 242K ohms at -40 degrees F to 2K ohms at 140 degrees F.
In short, with the a/c on you should have:
pin A - 5 volts
pin B - Ground (make note of the resistance value)
Bench testing the sensor....it ranges from 242K ohms at -40 degrees F to 2K ohms at 140 degrees F.
Tech Contributor
Joined: Jan 2007
Posts: 19,465
Likes: 1,166
From: Dyer, IN
215 ohms is way to high on the ground. The ground itself is back at the control head, but it goes to a splice first S215. The voltage at pin A is good. So your just looking at a ground issue. I'll see if I can find a location for S215.
Tech Contributor
Joined: Jan 2007
Posts: 19,465
Likes: 1,166
From: Dyer, IN
S215 is in the instrument panel harness. It seems unlikely for it to go bad, since it's not exposed to the elements. Make sure the connector is not corroded, and you are making good contact. If the splice was bad, other things would be affected i.e. door actuators, inside temp sensor, etc.
Thread Starter
Supporting Vendor
Joined: Sep 2007
Posts: 11,216
Likes: 178
From: Pensacola Florida GO GATORS!!! www.rlsebring.com www.c6c7vette.com
St. Jude Donor '17
S215 is in the instrument panel harness. It seems unlikely for it to go bad, since it's not exposed to the elements. Make sure the connector is not corroded, and you are making good contact. If the splice was bad, other things would be affected i.e. door actuators, inside temp sensor, etc.
I came up with SP202 which grounds (G202) at the same location I think that you are talking about, at the passenger "A" pillar. I think your right that other systems would be affected at this point. Since I have the voltage I will run a temp ground from the sensor and see what happens. I suspect the connector may be the culprit since I can shake and bang the connector and get a different temp reading, still not high enough to kick on the A/C.
I really appreciate your help. Once you started naming things I was able to go into eSI and find the schematics and such. I had put a tech 2 on it earlier and seen the open circuit and voltage but didn't know what I was looking at yet.
Thanks
Tech Contributor
Joined: Jan 2007
Posts: 19,465
Likes: 1,166
From: Dyer, IN
I came up with SP202 which grounds (G202) at the same location I think that you are talking about, at the passenger "A" pillar. I think your right that other systems would be affected at this point. Since I have the voltage I will run a temp ground from the sensor and see what happens. I suspect the connector may be the culprit since I can shake and bang the connector and get a different temp reading, still not high enough to kick on the A/C.
I really appreciate your help. Once you started naming things I was able to go into eSI and find the schematics and such. I had put a tech 2 on it earlier and seen the open circuit and voltage but didn't know what I was looking at yet.
Thanks
I really appreciate your help. Once you started naming things I was able to go into eSI and find the schematics and such. I had put a tech 2 on it earlier and seen the open circuit and voltage but didn't know what I was looking at yet.
Thanks
Thread Starter
Supporting Vendor
Joined: Sep 2007
Posts: 11,216
Likes: 178
From: Pensacola Florida GO GATORS!!! www.rlsebring.com www.c6c7vette.com
St. Jude Donor '17
I took the plug apart and found the corrosion at the half way point. I could get good ground reading about half way up the connection then nothing. I scavanged some other plug parts and rebuilt the plug and she is all better now reading just about dead on.
Thanks for the help. I found in eSI the reading values for a lot of the componants so now I am dangerous.
Thanks for the help. I found in eSI the reading values for a lot of the componants so now I am dangerous.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Tech Contributor
Joined: Jan 2007
Posts: 19,465
Likes: 1,166
From: Dyer, IN
I took the plug apart and found the corrosion at the half way point. I could get good ground reading about half way up the connection then nothing. I scavanged some other plug parts and rebuilt the plug and she is all better now reading just about dead on.
Thanks for the help. I found in eSI the reading values for a lot of the componants so now I am dangerous.
Thanks for the help. I found in eSI the reading values for a lot of the componants so now I am dangerous.
