What are the symptoms of a faulty car air conditioning pressure switch?
1 Answers
The symptoms of a faulty car air conditioning pressure switch include: poor contact of the contacts or abnormal operation of the pressure switch, leading to the compressor not working or failing to provide normal pressure protection. Car air conditioning pressure switches are categorized into low-pressure switches, high-pressure switches, dual-temperature switches, and three-stage pressure switches. The inspection methods for car air conditioning pressure switches are as follows: 1. Check the continuity of the pressure switch. Use an ohmmeter to measure the resistance between terminals 4M1 and 4M2 of the pressure switch. The resistance should be 0. If the resistance is not 0, it indicates poor contact of the normally closed contacts in the pressure switch, and the pressure switch needs to be replaced. If the resistance is 0, proceed to the performance test of the pressure switch. 2. Perform a performance check on the pressure switch. Test the operation of the pressure switch under specified pressure conditions. If the test results are abnormal, replace the pressure switch.