TrailBlazer 2002-2009
The TrailBlazer, originally introduced as an upscale Blazer, was produced from 2002 to 2008 with a powerful I6 engine and with a monster V8 offered in the Trailblazer SS
Platform: GMT 305, 360, & 370.

2008 TB Temp Gauge and A/C issue

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Old February 20th, 2014, 6:20 PM
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Default 2008 TB Temp Gauge and A/C issue

Having issues with the Temp Gauge reading 100 degrees continuously one session, and then read normal temps the very next drive session or next day. Also, The A/C will not work sometimes. The light indicator is on, the fan is blowing, but the compressor will not energize. Then suddenly, for no apparent reason, it starts to work normally. Someone please help identify these Gremlins.
Old February 10th, 2015, 6:01 PM
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Default Temp gauge and AC issue

My TB is having the exact same issue. I do have a code light on but have to read it still. Maybe the code could help you resolve your issues as well?
Old February 17th, 2015, 10:57 AM
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hello
i am having the same problem with a/c shutting off along with temp gauge drops off.
how ever when i disconnect battery and re-connect battery " does'nt matter 5 sec or 5 hrs " everything works normal. may last a day or weeks ! anybody had and resolved this issue ?
Old February 20th, 2015, 11:03 AM
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Mine ended up being the thermostat held open. The gauge would never go past 100 degrees. $420 later, I have a new thermostat and no more issues. AC works great as well. I think it shuts off the AC as a safety measure.
Old February 21st, 2015, 8:09 AM
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thanks, youkinda confirmed that. when the problem first started i was getting a eng cooling temp fault. just 2 days ago i got a thermostat open fault on the pcu. thanks for the feed back!!
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