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The first thing you would want to do is check for leaks, the most common areas to check for leaks is where the aluminum lines are crimped onto the rubber hose on the low-pressure a/c line. This is the line that runs along the top front edge of your engine, if it's leaking it will be wet and greasy looking. If it's not leaking and you have verified the system has the correct amount of freon in it, then you can try cleaning your condenser and evaporator core. Here's a few videos for you to watch on the subject, there's also links in the video description for what you would need to clean your condenser and evaporator core. Chris.

If the system hasn't been charged since factory, its possible the pressure isn't as high as it used to be. My brother's WD21 will blow warm then cold repeatedly while hearing the compressor kicking on and off. This is usually the sign of low refrigerant. Heat also expands, so its possible when it gets warm the refrigerant is getting to a high enough temperature for the system to "function". The VG has a weird adapter harness so the connection might be loose on one of the plugs. Not 100% on the VQ, I'd have to look at my donor car to know for sure. Testing for 12V at the plug should give a pretty good indication on how the system is functioning. 12V should turn on the compressor, and 0V off.

I got a payout, based on the cost to repair, so saving the labour doing the panel work myself I should have enough to get it repainted You're right parts are getting really hard to find. Almost tempted to get another parts truck...