So just got another ranger this winter, and the guy I bought it from said the ac hasn’t worked in a year or two. I checked the Freon pressure and it had plenty of Freon. The compressor kicks on and of every 3 seconds. It never gets cold, even if I’m idling or if I’m going over 30mph. Anyone have any suggestions?

 

Welcome to the forum

Reads like there is a blockage in the system, "compressor kicks on and of every 3 seconds" this means pressure is getting too high or too low

There are two pressure switches
High pressure switch prevents hoses and connections from Blowing Out
Low pressure switch prevents compressor from running out of "freon"/oil and burning up

Compressor sucks in "freon" from the evapotator(low pressure side)
It compresses the "freon" which heats it up(high pressure side), it then goes to the condenser in front of radiator<<<<is it getting HOT, it should
Condenser allows the heated "freon" to "condense", to turn back into a liquid
Hot "freon" then goes to the receiver/dryer, this stores the hot "freon" and removes any moisture
THEN............the hot high pressure "freon" goes through Orifice Tube/expansion valve, where it releases its pressure and heat which turns it to COLD "freon" and that travels through the Evaporator in the heater box
Then back to compressor

 

So any idea on what the main problem is?

 

Have it checked and serviced by a competent A/C specialist.