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andyh1956 · 06-16-2018, 10:56 PM

I would bet your evaporator is dirty (Filthy!) pull your blower motor out & you should be able to reach it & clean it with a toothbrush & a garden hose.
If your psi is right, the discharge line is hot, the intermediate line is warm & that accumulator & suction line is cold then it has to be a dirty evaporator or the blend air door.
PS- you can check to see if the blend air door is the problem by putting your pinch off plyers onto the hot hose coming from the engine to stop the hot coolant from reaching the HVAC box. If it starts blowing colder then the door adjustment may be all or part of your problem.

06-16-2018, 10:56 PM	#7
andyh1956 Registered User Join Date: Mar 2010 Location: thomastown mississippi Posts: 1,261	Re: 1984 k20 A/C Help. I would bet your evaporator is dirty (Filthy!) pull your blower motor out & you should be able to reach it & clean it with a toothbrush & a garden hose. If your psi is right, the discharge line is hot, the intermediate line is warm & that accumulator & suction line is cold then it has to be a dirty evaporator or the blend air door. PS- you can check to see if the blend air door is the problem by putting your pinch off plyers onto the hot hose coming from the engine to stop the hot coolant from reaching the HVAC box. If it starts blowing colder then the door adjustment may be all or part of your problem. Last edited by andyh1956; 06-16-2018 at 11:37 PM.