HEATER CORE

[wilbur]

On a 99 ch613 with the old style flat dash. Does it have to come out together with the evaporator or can u change it by itself?

[Mack man 1973]

My he heater core can come out without removal of the evap but not the other way around . I have done a lot of repairs on these systems have any questions let me know

[wilbur]

Thanks Mack Man. I was thinking while I was in there to change the evaporater an expansion valve also.

[Mack man 1973]

If the evap isn't filthy you can clean it put a new expansion valve and I always clean the heater box and and blow out the duct work. Also make sure you put on a new receiver dryer as well . Another trick I learned on the early red dot hvac systems is they did not come with a filter like the berg storm units in cx, cv etc and the dirt plugs up evap and you get hardly any air flow so before I Put the intake duct on the heater box on the passenger side I get one of those blue filters they use on the later models to protect the evap from dirt then when it gets dirty you only have to change the filter not clean the whole system again

[wilbur]

I keep planing on doing that but never have. I usually pull the cover an clean twice a year. I use a tooth brush with an extended handle.