system is icing up. you need to have him re check the system pressures to find the problem

Roy

Answered by ASEMaster6371 (expert)
24,836 answers provided

Try backing off the temperature to higher than minimum to see if problem persists. Keeping temperature at minimum coldness can result in frosting/icing of the evaporator coil when there are fresh air leakages into the cabin.

Answered by KHLow2008 (expert)
39,869 answers provided

The mechnic changed the expansion valve there is a difference now it can go t0 40mins then blows normal air with decrease capacity of blowing after 40min ,the other difference before the passanger and middle ac part were not as strong in cooling then the driver ac part now the cooling strength is similiar .Now if fresh air is leaking in the evaporator can it be sealed and how can we know if there is a leakage of fresh air into the evaporator? .i am also thinking can the replaced compressor be to powerfull for the evaporator that it makes if frost ? I will work on telling him to check the pressure maybe its not adequate and also could the system have not enough oil? or excess oil?

Response from josephnsicilima
1 question asked

Ensure the vent for fresh air is set at recirculating. Check window glasses for proper sealing. Ensure the firewall grommets and wireharness holes are properly sealed.

The decreased air flow confirms the cooling coil is icing up.

If the thermosensor at cooling coil is not positioned correctly, the cooling coil would be iced up before the control unit is told to cut off. a faulty thermosensor would result in that also.

Did you try setting the temperature to a higher setting? I would never set my temperature at minimum when running for long distances.

Answered by KHLow2008 (expert)
39,869 answers provided

it could be one of this , thermoster not in the prober position , or the equalization tube for the EX valve not fitted on clean serface , as the technician have change it , i would recomend to start the vehicle and the AC at the 3rd speed and opne the doors get the air recycl from out the vehicle leave it runing for about 30 minet and see if it does it , then you need to check the EX valve and it is inside the evao box

Answered by aty
1 question asked