How to check for a faulty fan relay?
Defective faulty fan control relay 1 Open or shorted fan control relay harness Open or shorted fan cooling fan harness Poor electrical connections in the cooling fan circuit Defective coolant temperature sensor To diagnose this error code, mechanics use a scan tool to check for any codes present in the PCM.
What does check engine light mean on air conditioner?
The check engine light illuminating may indicate a faulty cooling fan relay. A faulty cooling fan relay can also negatively affect air conditioning (A/C) performance.
How do you test a car relay with no power?
If there is no power, the electrical system must be tested starting with the fuse then the relay. If power is present use the test light connected to battery power to check the ground circuit. if these tests check out, the accessory is bad and needs to be replaced.
Can a bad fan relay cause an engine to overheat?
However, a bad cooling fan relay isn’t the only culprit for excessively high engine temperatures. Many other issues can cause the engine to run hot or overheat. Rather than uncommonly high engine temps, the driver may notice that the cooling fans have stopped running.
How can I tell if my cooling fan relay is bad?
There are several ways to tell if a bad cooling fan relay is to blame for an overheated engine. The easiest method is to start the engine and then turn on the air conditioning. If the fan doesn’t engage, there may be something wrong with the cooling fan relay.
The check engine light illuminating may indicate a faulty cooling fan relay. A faulty cooling fan relay can also negatively affect air conditioning (A/C) performance.
What is the diagnostic code for cooling fan 1?
P0480 is a diagnostic trouble code (DTC) for “Cooling Fan 1 Control Circuit Malfunction”.
What happens when a radiator relay goes bad?
A faulty or broken relay cannot deliver power to the cooling fans. In turn, the unpowered fans won’t run, leaving the radiator to its own devices. Deprived of the helpful influx of air from the cooling fans, the radiator cannot remove as much heat as it usually does.