'02 TB outside temp sensor not working

[wrecks2020]

My '02 Trailblazer LTZ has an "issue" with the AC not working when the OAT is indicating low. The temp shows all over the scale...from -26 C to +20 (real temp). I've read that this is a common problem on these trucks. Help!

 

[Wooluf1952]

Welcome

In case you haven't heard:
http://gmtnation.com/f5/welcome-gmtnation-com-heres-story-226/

It is fairly common. IIRC, a new OAT sensor is around $5 from the dealer.

 

[Team Dougherty]

This part# is what you need 25775833

http://www.rockauto.com/dbphp/prt,315,25775833

 

[The_Roadie]

Agreed. It's so cheap from the local dealer that they can often beat mail order. Available also at your local aftermarket parts stores if you have an aversion to setting foot in a dealer. I've been abused, so I have a full-blown phobia about dealers. YMMV.

And trivial to change out - near the hood latch. Buy the part, then search for something that looks the same.

 

[wrecks2020]

Welcome

In case you haven't heard:
http://gmtnation.com/f5/welcome-gmtnation-com-heres-story-226/

It is fairly common. IIRC, a new OAT sensor is around $5 from the dealer.

what happens if I disconnect it? Will that cause any problems?

 

[Denali n DOO]

what happens if I disconnect it? Will that cause any problems?

not sure if yours is same as mine but when I had that issue i reset the system by holding; "fan mode-front defrost-rear defrost" all at the same time. When I did this the outside temp went up to 41 and slowly decreased 1 degres at a time until it matched the real outside temperature. No issues since.

 

[wrecks2020]

not sure if yours is same as mine but when I had that issue i reset the system by holding; "fan mode-front defrost-rear defrost" all at the same time. When I did this the outside temp went up to 41 and slowly decreased 1 degres at a time until it matched the real outside temperature. No issues since.

I tried this and the gauge reset itself to -36C. I started it this morning and it was reading +10 and then went to +6C so the air works now....WTF?

 

[envisionelec]

I tried this and the gauge reset itself to -36C. I started it this morning and it was reading +10 and then went to +6C so the air works now....WTF?

The sensor is intermittent. I took mine apart and found a cracked connection to the thermistor. Tilted one way, it read fine - tap it, it doesn't.