Hi all, I’m admitting to being completely ignorant of things related to temp control in my A/C equipped 1972 350 auto. I have recently fitted a new compressor so it had a fresh recharge. Compressor kicks in but all I get is HEAT inside. Any tips on either troubleshooting the system? I’m considering clamping off the water hoses supplying the heater core out of desperation during an Aussie summer. The heater fan was initially stuck on. Now it won’t run at all!