When it's cool outside, I get cool air in my AC. But when it gets warm like what has happened last week or the other week, the AC only blows cool when engine is cold, but when it warms up the AC blows warm air. I can sense that it's trying to cool it but all it gives is warm air.

Bit of history on the 300D though. Condenser has been replaced but I didn't know much back then so the drier wasn't. It was an accident so the radiator, aux fan, etc had to also come out and be replaced. Condenser didn't leak or so they said, after the accident, prior to swapping it.

It has R12 and when it's cool outside I set it to max setting and it gets really cold, but once the outside temps get warmer like 80's to 90's F then it gets less efficient.

My friend said the monovalve may be stuck giving warm air but now that it got cooler, I got colder air out the vents. During the cold season I was able to get cool temps at the vents, I don't remember what measurements I got but it was around 12C at the vents (coldest) when ambient temps were around 30C I think.

Anyway what do you think is the culprit? Do you think the original compressor needs to go, the drier has to be replaced, or something else? Those are the two that I'm looking at because the compressor is still original while the drier wasn't changed when the condenser was. Thanks.

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