Under the hood, locate the 2 hoses going through the bulkhead. With the engine running and hot, grab these hose. (If you can). They should be almost too hot to hold. See if there is a valve on one of these hoses. If there is, have someone move the temperature control back and forth while you observe the valve. You should see the actuator move. And you should feel a difference in temp on the bulkhead side. If not, bad temperature control valve.
In the passenger compartment, engine running, listen carefully for doors and actuators moving under the dash as you move the temperature control and selector switches around. Observe the air box to see if the actuator controls are moving when you make changes to the settings.
Friday, January 13th, 2012 AT 1:12 AM