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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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My md-11sr starts and runs but just blows air, not cold air.

Customer Question

my md-11sr starts and runs but just blows air, not cold air. a code 6 comes up, and my pretrip fails. what can i check? code 6 is just a engine coolant sensor,correct?
JA: Did you double-check the thermostat's settings? And what about the filters?
Customer: the cooling temp is set for 38 degrees, but does not cool down from box temp which is 50 degrees. which filters? air on the engine
JA: Do you plan on doing the work yourself?
Customer: if i can, nearest tech is 150 miles away. do you have any ideas why the unit doesnt get cold? how do i see if it needs freon. code does not come up for it,so i think it has enough.
JA: Anything else we should know to help you best?
Customer: what filters were you saying to check
Submitted: 7 months ago.
Category: HVAC
Expert:  airheatman replied 7 months ago.

I think the 6 is a refrigerant cooling sensor.

Expert:  airheatman replied 7 months ago.

Trying to find something in manual to tell us what you can check. The engine coolant sensor would be 18

Customer: replied 7 months ago.
your right, 6 is coolant temp sensor. how do i find and check this?
Expert:  airheatman replied 7 months ago.

I am not finding a service manual in my archives.I will open to other experts to see if they have available.

Customer: replied 7 months ago.
have you found anything
Customer: replied 7 months ago.
Airheartman , i have not heard from the new Tech yet, any ideas yet?