Question about 2002 Chevrolet Blazer
Temp setting on 50 degrees all the time it always says 50 degrees no matter the temp outside
Posted by Anonymous on
Check the grill, they are located along the side if i am not mistaken and they do get dirty
Posted on Jun 13, 2014
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Posted on Jan 02, 2017
If there is nothing else wrong with the system you just need to drive it over 25mph for more than 2 minutes. If you slow down below 25mph then you will have to start over. I would recomend getting on the freeway. Don't go over 60mph though, that will make it reset also. If it still says -40 after you are sure you have met the time and speed criteria. Then there is still a problem in the system. Make sure the connector at the temp sensor is clean and the terminals are good.
Posted on Oct 13, 2009
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If you mean the temperature display on the rearview mirror, you need to replace the outside temperature sensor. It is located under the hood, on the radiator support on the top near center.
Posted on Oct 12, 2010
The most likely cause is a failed blend door actuator; however I recommend a little troubleshooting. First, can you hear a clicking sound behind the dash when you turn the setting to hot? If yes, it is certainly the actuator stripping its gears. If not, check to make sure the heater hoses are both hot as they connect to the heater core at the firewall (in the engine compartment). If one or both of the hoses do not get hot, there is a blockage caused either by an air bubble or a stuck water control valve in the heater hose. If the hoses are both hot, the indication is again the blend door actuator. Fig. Remove the floor air outlet duct extension (1) from the floor duct (2) Disconnect the electrical connection at the blend door actuator (#10 in pic below). Fig. Blend door actuator and related components Remove the blend door actuator mounting screws from the HVAC module. Remove the blend door actuator as an assembly with the actuator cam. Fig. Remove the blend door actuator mounting screws from the HVAC module Picture of actuator:
Below are instructions for replacing the actuator. Look at the diagrams carefully--the big arrows point to the front of the truck and the actuator is on the side of the heater box above the outlet duct that runs to the driver's side of the floor. Also, the actuator is expensive, so I recommend you make sure it's bad and shop around a bit to get a good price. To check out the actuator, first see if you can turn the blend door by hand. If you can't turn it, maybe it's jammed. Also, reconnect the actuator after removing it and see what it does when you turn the heater to hot.
Removal & Installation
Fig. Remove the floor air outlet duct extension (1) from the floor duct (2)
Disconnect the electrical connection at the blend door actuator (#10 in pic below).
Fig. Blend door actuator and related components
Remove the blend door actuator mounting screws from the HVAC module.
Remove the blend door actuator as an assembly with the actuator cam.
Fig. Remove the blend door actuator mounting screws from the HVAC module
Picture of actuator:
Posted on Dec 07, 2010
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