HVAC External Reading won't move
Thread Starter
Race Director
Joined: Apr 2004
Posts: 16,135
Likes: 5
From: Newberry FL
Cruise-In VIII Veteran
St. Jude Donor '07
HVAC External Reading won't move
I pulled my shroud off today to install the vararam and the external temp on the HVAC has not changed. It reads 69 degrees. Any ideas?
Thread Starter
Race Director
Joined: Apr 2004
Posts: 16,135
Likes: 5
From: Newberry FL
Cruise-In VIII Veteran
St. Jude Donor '07
Thanks. I checked the connection and it was good...went cruising and something clicked, because it is working now. Who'd guessed it.
Burning Brakes
Joined: Jan 2006
Posts: 1,170
Likes: 27
From: Magnolia Greens NC
here's what may have happened..
That sensor is either a resistance temperature detector (RTD's) or Thermistor. The resistance of the sensor changes with the temperature.
If you have any corrosion in any of the associated connectors it will increase the resistance that the climate controls is reading.
The resistance across the two sensor wires could be almost infinity,
in that case, your display would read a low temp of 69*.
If the sensor is not making good contact(loose) or corroded, the HVAC defaults to 69*
Once you clean it or replace it...you need to drive a few miles for it to start reading the outside temp and work correctly...
GM Part # 10248414 is aprox. $10 from the dealer and just plugs in.
If you have any corrosion in any of the associated connectors it will increase the resistance that the climate controls is reading.
The resistance across the two sensor wires could be almost infinity,
in that case, your display would read a low temp of 69*.
If the sensor is not making good contact(loose) or corroded, the HVAC defaults to 69*
Once you clean it or replace it...you need to drive a few miles for it to start reading the outside temp and work correctly...
GM Part # 10248414 is aprox. $10 from the dealer and just plugs in.
Thread Starter
Race Director
Joined: Apr 2004
Posts: 16,135
Likes: 5
From: Newberry FL
Cruise-In VIII Veteran
St. Jude Donor '07
That sensor is either a resistance temperature detector (RTD's) or Thermistor. The resistance of the sensor changes with the temperature.
If you have any corrosion in any of the associated connectors it will increase the resistance that the climate controls is reading.
The resistance across the two sensor wires could be almost infinity,
in that case, your display would read a low temp of 69*.
If the sensor is not making good contact(loose) or corroded, the HVAC defaults to 69*
Once you clean it or replace it...you need to drive a few miles for it to start reading the outside temp and work correctly...
GM Part # 10248414 is aprox. $10 from the dealer and just plugs in.
If you have any corrosion in any of the associated connectors it will increase the resistance that the climate controls is reading.
The resistance across the two sensor wires could be almost infinity,
in that case, your display would read a low temp of 69*.
If the sensor is not making good contact(loose) or corroded, the HVAC defaults to 69*
Once you clean it or replace it...you need to drive a few miles for it to start reading the outside temp and work correctly...
GM Part # 10248414 is aprox. $10 from the dealer and just plugs in.
I went cruising again last night and no issues, so maybe this issue was cleared up. It was unplugged and once I figured it out and cleared all the coulda...most histoy and one HVAC 0333 code it went away. Apparently that was the issue...the connection was not there and when. I found the code it reset things.
Last edited by mph1972; Jul 11, 2010 at 01:01 PM.
