Blowing extremely cold air (single digits) until it. The leak is from the evaporator, you can remove the evaporator/heater core assly without removing the the whole hvac unit Clamp the heater hoses and remove them from the core, recover the refrigerant and removed the lines and exp Mack truck evaporator removal procedure explained evaporator leaks and clogged drain lines commonly cause hvac inefficiency in mack truck cabins To remove the evaporator, first disconnect the battery and evacuate refrigerant safely Access the evaporator by removing the dashboard or hvac housing.
The mack mr & le series r134a capacity specification for that year is in fact 2 lb Most others are 3 pounds with the exception of the cl cv, cx and ch with sleepers are 3.5 pounds Is the evaporator surface clean Almost every truck i work on has a dirty evaporator. My dads mack dump truck seems to be leaking all of the refrigerant out of the ac system He said the ac stopped blowing cold one day, recharged the system, but the next day it was all hot air again
Looking at you post i was before considering how an undercharged system would make the compressor cycle to much Will and overcharged system make the compressor cycle to much, also will overcharged system freeze up the evaporator I was told the clutch cycles to prevent the evaporator from freezing up, i do not know if this is true. 1 now viewing page 1 [50 messages per page] Blows good and cold at idle.62 degrees As soon as you start driving down the rd.its starts warming up.82 degrees.i cleaned evaporator install new cabin filter.checked freon and that was good.recirculation door works properly.cleaned bugs out from c.
I replaced a/c parts on my condenser, air dryer, thermostatic switch in dash, evaporator I charged the system up it started to blow cold but once i got in the truck to drive it the air started to blow less cool than when sitting at idle The truck is a 97 ch 613 dump truck(day cab) What is an evap leak An evap leak means a leaking evaporative emission control system Also, a trouble code indicating an evap leak tells you there is a problem with the evaporative emission control system
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