Auto Air Conditioning & Heater Repair: 2001 Chevy Blazer*No Heat !!, engine thermostat, chevy blazer

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