A couple of weeks ago, my Blazer started blowing warm air from the vents. I assumed it was low on freon so I checked high side pressure with the gauge have and it was hitting 600+ psi and the compressor would cut off in about 5 seconds. I replaced the orifice tube in case it was clogged and accumulator in case the desiccant busted and was getting into the system. Neither helped the issue. I recharged with less than one 12oz can and it's still doing the same thing. Which leads me to believe still an obstruction in the system. How can I flush this without a vacuum pump? Any other suggestions? Thanks.

 

I know the ac shops around here will suck out all the freon you have in the system and vac the system for free, and only charge a small amount to top it off. Might be worth a call to see.