jericho
Registered User
I'm the opposite, I fill to the spec, maybe a little more. We actually do have a spring here in ohio that will be 70 degree temps and extremely humid. We use ac for water removal as much as we do for air cooling. I would for sure have an evaporator freeze up if I undercharged.
Typically, on retrofits, I look for low side pressure to be around 40 idling in the shade, max ac selected. But I also install either a high pressure compressor cut off, and/or a pusher fan, so extreme high side temps don't concern me.
The pusher fan is mainly for idle cooling. On some vehicles I've had issues with it even after messing with orifice tube sizes. I think on some vehicles a viscous fan clutch simply doesn't sense condenser heat. Electric Pusher fans can be had for dirt cheap, and they solve the problem.
This is the biggest thing. You gotta do what works for you, and each truck/climate is different.
I didn't realize low charge could cause freeze up. I also use my ac a lot of the time for high humidity and moderate temps. Also almost any time its raining my windows fog up in my reg. cab and the ac defrost saves the day. I will keep this in mind.