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Auto Air Conditioning & Heater Repair/heating problems in my trailblazer

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Expert: - 11/19/2011


Question
I have a 2000 Chevy Trailblazer and the heat doesn't work in it. We have replaced the thermostat twice so that is working properly. We have also flushed the heater core. Both hoses coming from the heater core are hot like they are supposed to be and the heater core isnt leaking at all, but still when you turn the heat on all that blows out of the vents is freezing cold air. What else could cause this to happen?

Answer
Hello
For one reason or another the flaps are not moving to allow the heat off the matrix.
If it is a full climate control system they are likely to be contolled electronically
Typically thist type of system will have an LCD readout on the control panel.

If you have traditional red & blue controls, the flaps may be controlled by rods or vacuum.
What you need to know is are the moving.
Start the engine, select the second fan speed then turn the air direction selector on the heater.
You should be able to hear the flaps move, if not, let me know and if you need more help I will find out more information  

Auto Air Conditioning & Heater Repair

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Paul Evans/ www.chillywillys.org

Expertise

Any question related to the function or malfunction of vehicle air conditioning excluding model specific problems with the heater controls. We are a UK based company and are unlikely to be familiar with the exact make and model of American vehicles. We will always at least try to guide the owner towards what the problem is likely to be in this instance We may struggle with none specific electrical issues related to the a/c without seeing it but it is likely we could narrow the problem down

Experience

Director www.chillywillys.org specialising predominantly in UK vehicles, fleet, rare and collectables. Although all a/c works on the same principal US vehicles have different controls and electrics. 12 years experience automotive and aircraft air conditioning. This is our sole source of revenue, we see lots of a/c issues that we are able to diagnose accurately mainly down to experience. UK have garages caught on to a potential revenue stream within the last few years but sometimes struggle with the problems as they don't see the issues that often........to be fair they could get their own back and ask me to change a timing belt ! Certain vehicles have known issues, we can help with that and also anything that is obvious to us but not necessarily to the bamboozled owner....... a/c is relatively new here and owners are catching on to maintenance but are sometimes still misguided by inexperienced individuals a bit timid to say' I don't really know

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