If a 1997 Jeep Grand Cherokee Ltd only blows hot air but the fan speed still works what could be wrong?

Answer 1

Well, I can't solve the problem but my '98 Grand Ltd has also begun blowing hot air only. It does it on any heater setting,hot or cold,and the a/c running makes no difference--still hot only.It is as if the system has locked up somehow. In an old manually operated heater it would be a fault with the hot water valve sticking and not closing off. From reading on this site it seems that it may be related to the air blend door sticking.Allowing hot air only---and costing around $850 to repair.There must be a better way !