2003 CHEVY TRAILBLAZER HEATER FAN ONLY WORKS ON HIGH

replace with this and it will work. Heater Blower Motor Resistor 2003 Chevrolet Trailblazer 2WD 8 Cylinders...

Hi. There happens to be a common problem with these trailblazers inside the ducting box located under the dashboard. The mode actuator door motor stops working due to a faulty motor itself and the default position is defrost only. As far as the Air Conditioning not working, there maybe another problem to diagnose there. Could be low refrigerant, or electrical problems to the compressor, or faulty fan clutch(another very common problem with these trucks). Type in mode actuator door and 2005 trailblazer in your search engine online i.e. Google or Yahoo and you will find many posts about this problem. I think there may even be a Youtube video about replacing it. Let me know you need more help. Thanks.

Switch relay # 45 with relay #46 under the hood fuse box, do you now have lights? Clean your relay contacts really well, if this doesn't work, order a new relay. Very common problem.

Your problem is most likely the fan relay. It is normally under the hood in the fuse box. Open the fuse box locate the fan relay (most are labeled ) If labeled tap on that relay and the fan should shut off if it does the relay needs to be replaced. If its not labeled tap on the relays one at a time till it shuts off. The one you tap that shuts it off is bad pull it out like a fuse and replace it. 4 thumbs up is appreciated if this helps.

Replace Relay #46

Check the relay in the relay/fuse box under the hood. There should be a diagram either on top of the cover or under the cover to tell which relay it is just like your internal fuse box.

maybe a fuse the fuse box is under the drivers side passenger seat . sometimes ive seem them get something spilled on them and i had to wiggle the fuses to clear the corrosion

you should be able to remove the beuty couver of the front of you dash, and find 4 screws holding the heater control Assembly in place, comes out of the front, easy re & re good luck

check fan blower relay

well, check the fuse/relay then you will need to remove the control panel to access the switch then check the switch its self in all positions with a volt meter. if none of those things have found the prob then you prob have a bad blower motor. most likely its a fuse/relay usualy or a switch. when a motor goes it usually will still blow on high. if its out completely it ususaully smells like burnt tape.dont worry its prob something simple and cheap, ie fuse/relay. Let me know MrRodneyLong@gmail.com