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Customer Service

Warranty Information

HVAC Service Documents

Recommended Charging Procedure
Charge Determination
Basic Troubleshooting
R134a and PAG Oil Handling
Compressor Oil Handling
Compressor Troubleshooting
Blower Motor
Glossary of Common HVAC components

Gauge Diagnostics

Using Gauges for Troubleshooting
Air in cooling system (insufficient suction)
Defective expansion valve
Excessive refrigerant
Insufficient compressor operation
Insufficient refrigerant
Moisture Intrusion
Refrigerant does not circulate

Summary Table of Gauge Diagnostics

Blower Motor Troubleshooting

(download PMI Pocket Guide to Blower MotorTroubleshooting)

Problem 1: Blower Motor does not operate

Possible Causes Inspection Remedy
Blown fuse Inspect the fuse and wiring Replace fuse and repair wiring
Broken wiring or bad connection. Check the fan motor ground and connectors. Replace
Fan motor malfunction Check the lead wires from the motor with circuit tester. Replace
Broken resistor wiring Check resistor using a circuit tester.


Fan motor switch malfunction. Operate the fan switches in sequence and check whether the fan operates. Replace

Problem 2: Blower Motor operates with Low air flow.

Information obtained in ZEXEL Service Manual
Basic service procedures for R134a Air Conditioning Systems.
Copyright 1992

Possible Causes Inspection Remedy
Evaporator inlet obstruction Check evaporator inlet and filters. Remove any obstruction and blow out filters or replace.
Air Leak Check the cooling unit case joints for leaks. Repair or replace any leakage areas.
Defective thermoswitch or cold control switch. (frozen evaporator) Check the switch using a circuit tester. Replace.

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Perrin Manufacturing is committed to providing you with superior products and services; we renew this pledge through continual improvement of our products and motivation of our staff.

We faithfully comply with all of the requirements of our ISO 9001:2008 Quality Management System, the most current edition of the standard. Beyond that, our highly trained quality staff persistently search for new ways to improve the effectiveness of our system.
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