Sounds like it's not building up much pressure, which may be why you are not feeling cold air and why it keeps cycling.
It may have a timer built into the system that limits the compressor's ON time to 5 seconds with a minimum of 20 seconds OFF time.
One thing you need to check is that the air conditioning system's doors are opening and closing correctly to direct air from the condensor into the cabin of the vehicle. If you look under the dash on the passenger side, you should be able to see the levers attached to the internal doors in the ductwork. Watch those levers and see if they move when switching from heat to cool to outside air and recycling inside air.
If the doors are working, you will need to get a mechanic to check the high and low side pressure in the system while it's running. This is something that an amateur should NOT do on their own. The pressures involved are DANGEROUS.
Saturday, June 2nd, 2007 AT 6:31 AM