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Auto Air Conditioning & Heater Repair/2001 Chevy Blazer*No Heat !!

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Expert: - 2/28/2011


Question
Hi Paul,
When I turn on my heater I only get cold air !
The A/C works ok !!
Can You Help ?
Thanks !!

Answer
Do you have water in your radiator and is the engine thermostat working?
Check your radiator/expansion tank for levels.

There will be two hoses visible on the bulkhead heading in to the car under the bonnet, are they both hot or is one cold?
Test all the water hoses in and out of the radiator and either side of the thermostat, are they hot ?
If you can test all this then we know that there is hot water flowing right round the system including the heater matrix.
Cold anywhere is a sign of restriction at the point where you find it, you may also have a hot water valve on one of the hose leading in through the bulkhead, if it exists it may be sticking preventing hot water passing through the matrix.

It doesn't sound as if any of the flaps are sticking around your heater controls so I suspect there is not hot water in the matrix

I am sorry that I cannot be more specific but we are a UK based company with no access to information specific to your vehicle, do take care to secure all loose clothing prior to leaning over your hot engine, in particular round the radiator fan ! I have lost a few ties this way.......

Let us know how you get on and please ask for more help if you need it

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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