How to Troubleshoot a Toyota 4Runner A/C

The A/C in your Toyota 4Runner cools the passenger cabin using compressed refrigerant. This refrigerant is compressed using a compressor called an "A/C Compressor." The compressor is driven by an accessory belt. If any one of these components is malfunctioning or broken, the A/C system will not work. Replacement A/C parts can be purchased from most auto parts stores. But, before you start replacing parts, you should troubleshoot your Toyota 4Runner's A/C.

Difficulty:

Moderately Easy

Instructions

1. • 1

     Open the hood and check the accessory belt that wraps around the A/C compressor pulley. The belt should not be frayed or damaged in any way.

   • 2

     Check for any peeling or chipping on the pulley belt teeth. Check for any glazing or "haze" on the belt. Any worn belt teeth or any damage to the belt indicates that the belt may be slipping and needs to be replaced.

   • 3

     Start the 4Runner's engine and wait until the water temperature gauge needle sits at or near the middle mark on the gauge. Turn the A/C blower on and set it to the coldest setting.

   • 4

     Check to see if there is any cold air blowing into the cabin. If there is no cold air, there is likely no refrigerant in the system. The most common leak on the 4Runner is at the A/C compressor, which should be serviced by a professional mechanic.