Temp gauge drops to 0 and AC stops working intermittently

Asked by Tyler Jul 16, 2018 at 02:04 PM about the 2009 Chevrolet Trailblazer 2LT RWD

Question type: Maintenance & Repair

While driving, usually in the morning, my temp gauge will
drop to 0 and the AC will stop working. I have been able to
fix it by pulling the negative battery cable and reset the
ECU, everything works as it should immediately. I have
tested the harness going to the sensor and it has both 5v
and continuity to ground. The sensor read around 500
ohms when I tested it. All hoses are hot and have pressure
as they should. What's going on here? Any ideas?

2 Answers

30

Either bad Engine coolant sensor, bad thermostat or both. Older engines they are behind the alternator right next to each other so replace them both newer engines they moved the sensor to the other side of the engine back by the firewall. So try one and then the other.

3 people found this helpful.

When temp light goes on .i stop car ..wait a minute .but it wont turn over

Your Answer:

Chevrolet Trailblazer Experts

  • #1
    FJ4072
    Reputation
    3,150
  • #2
    G A Arne
    Reputation
    2,000
  • #3
    bigdogracer
    Reputation
    1,960
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Chevrolet Tahoe
10 Great Deals out of 703 listings starting at $6,871
Used Jeep Grand Cherokee
91 Great Deals out of 4,706 listings starting at $1,938
Used GMC Envoy
16 listings starting at $5,995
Used Chevrolet Traverse
34 Great Deals out of 1,381 listings starting at $3,595
Used Chevrolet Silverado 1500
111 Great Deals out of 10,257 listings starting at $3,655
Used Ford Explorer
44 Great Deals out of 2,928 listings starting at $4,999
Used Chevrolet Equinox
68 Great Deals out of 5,622 listings starting at $1,800
Used GMC Yukon
17 Great Deals out of 942 listings starting at $4,100
Used GMC Acadia
44 Great Deals out of 1,535 listings starting at $4,995
Used Chevrolet Impala
17 Great Deals out of 894 listings starting at $2,495
Used Dodge Charger
37 Great Deals out of 761 listings starting at $3,900
Used Ford F-150
184 Great Deals out of 12,295 listings starting at $2,197

Used Cars for Sale

2009 Chevrolet Trailblazer For Sale
2 listings starting at $7,950
2008 Chevrolet Trailblazer For Sale
5 listings starting at $6,495
2007 Chevrolet Trailblazer For Sale
6 listings starting at $2,950

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.