Auto Air Conditioning & Heater Repair: No Heat, chevy blazer, heater hoses

Question
I have a 99 Chevy Blazer with Computer Climate Control that will not put out any heat.  I can turn the control all the way to 82 (max heat) and the blower speed will increase but continues to blow cold air.  I have tried it in the Auto setting and by manually selecting an air discharge point.  It will kick off the A/C compressor but will not heat up.  Please advise

Answer
You have a tough one to diagnose without me actually having the vehicle in order to prform some test procedures. The most common faults are:

1. Make sure that BOTH heater hoses are HOT to the touch when the engine is at normal operating temperature.

2. You could have a problem in the control panel as there are several test procedures that need to be done on the panel controls.

3. you may have a fault in the AIR TEMP ACTUATOR of which also requires several test procedures.

4. You may have a fault in the DAMPER DOOR control module of which requires testing procedures.

I wish I could give you the answer you are looking for, But without performing all of the required testing that is needed, I would only be guessing as to your EXACT fault.

You are going to need professional diagnostics to find the exact cause.

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