First make sure the cooling system is full & with the engine at operating temperature check to make sure both heater hoses going into the firewall are hot with engine running,
If this is good you most likely have a bad temperature actuator.Before replacing the actuator,try this recalibration first.
Use the following steps to perform the calibration update:
Important: The module memory will not clear if the battery positive voltage circuit fuse is installed in less than 60 seconds.
Hey John: Cliff here. I tried what you suggested but it did not seem to work. Is replacing the temperature actuator something I can do or do I need to take it to the dealer?
Once again thank you for your help.
Here is info to help you replace the temperature actuator.I suggest looking at the actuator while moving the temperature control & see if the shaft moves.There is one on each side of the vehicle.Also have the system (body control module) scanned for failure codes to make sure it is not a open circuit causing this problem.
Temperature Valve Actuator Replacement - Left Side
Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
Tighten Tighten the screws to 1.5 N·m (13 lb in).