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1970m0par440 10-04-2012 09:49 AM

AC Temp Control Issue
Hello Everyone! I have a 2005 Ram 1500 5.7L that I bought a few months ago. First, I had an issue with the AC not blowing enough air on full blast. I found on this form that it was due to the recirculating door that broke off. That fixed the problem and it blows a TON of cold air on full blast. Now I have a problem I cant figure out with the temperature control knob that goes from cold to hot. If it is all the way on cold then it will blow cold, but if I move it just one slight turn it will immediately start blowing HOT air. Any ideas on what might cause this? I appreciate any advice in advance.

RamTech 10-04-2012 10:31 AM

Probably a blend door/actuator related problem. I assume since you haven't mentioned anything about it happening only on one side that you have single zone climate control. The blend door is located behind the center stack in the dash.


The blend door actuators are reversible, 12-volt direct current (DC), servo motors. Models with the single zone heating-A/C system have a single blend-air door, which is controlled by a single blend door actuator. Models with the dual zone system have two blend-air doors, which are controlled by two blend door actuators.
The blend door actuator (1) for the single zone heating-A/C system is located near the center of the HVAC housing (2), close to the dash panel.
For the dual zone heating-A/C system, the same blend door actuator used for the single zone system becomes the driver side blend door actuator, which is mechanically connected to only the driver side blend-air door. A second separate blend door actuator (3) located on the top of the HVAC housing is mechanically connected to the passenger side blend-air door.

All actuators (1) are interchangeable with each other. Each actuator is contained within an identical black molded plastic housing with an integral wire connector receptacle (2). Each actuator also has an identical output shaft with splines (3) that connect it to its respective door linkage and three integral mounting tabs (4) that allow the actuator to be secured to the HVAC housing. The blend door actuators do not require mechanical indexing to the blend-air doors, as they are electronically calibrated by the A/C-heater control.

1970m0par440 10-04-2012 02:37 PM

Thank you, RamTech, for the detailed information. I am going to check this out and see if it fixes the problem.

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