I would get a service manual and research this further. If it is the blend door it is not accessible behind the radio, it would actually be behind the glove compartment.
If the blend door and/or blend door actuator IS at fault you should hear the blower motor come on, but would get either no air flow or just cold air through your vents when the heater is on. - I would also check to make sure both of your heater hoses going into the dash through the firewall are hot to make sure that we have good flow through the heater core.
Sunday, October 12th, 2008 AT 10:21 PM