Possibly a blend actuator fault. If an overtravel occurs, it is usually a symptom that the system will default to a full position, hot or cold. It will usually set a fault ode, but you need a scan tool that will access body systems, not just a powertrain code reader. Another concern is whether the compressor is engaging. If it is dual zone, and both sides are warm, or ambient, make sure the compressor is coming on when requested.
Friday, July 1st, 2011 AT 3:19 PM