Where are the cooling fan relays on a radiator?

The electric cooling fan (s) are controlled by the Body Control Module (BCM) which enables the fans through the PCM. The PCM enables the ground path for the three cooling fan relays. The relay (s) are used to control the high current flow to power the cooling fan motors.

What are the symptoms of a bad cooling fan relay?

1. Engine running hot One of the first symptoms commonly associated with a bad or failing cooling fan relay is an engine that runs hot or overheats. If you notice that your engine is running at higher temperatures than normal, that may be a sign that the relay is not functioning properly.

When do you turn on the fan relay?

When the correct parameters are met, a temperature switch or the computer will activate the relay, which will allow power to the fans. The relay will usually be activated once it is detected that the vehicle’s temperature approaches excessively high temperatures.

Why are my cooling fans running at all times?

3. Cooling fans stay on at all times. If the cooling fans are staying on at all times, this is another (less common) symptom of a possible problem with the cooling fan relay. If the relay shorts internally, it may cause power to be permanently switched on, which will cause the fans to run at all times.

How does the mode control relay work on a radiator?

The relay (s) are used to control the high current flow to power the cooling fan motors. When minimum cooling is required, the BCM will command the PCM to energize cooling fan relay #1 and since both fans are connected in series through the Mode Control relay, both fans will operate at low speed.

How does a condenser fan work with a radiator fan?

The condenser fan relay provides power to the condenser fan. Both fans ground receive ground at G109 located on the right radiator support. If the radiator fan relay is activated and the ECM detects that the fan can’t provide adequate cooling, it will activate the condenser fan relay to provide supplemental cooling.

How does the radiator cooling fan relay work?

The cooling fan relay takes the low voltage signal and internally switches the relay “on” to allow battery voltage to be supplied to the radiator cooling fan. By using a lower voltage signal to control the relay, there is less stress on the rest of the wiring and charging system.

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.

How do you check the cooling fan relay?

Verify the operation by energizing the cooling fan relay. This is done by either warming the engine up to operating temperature or by turning on the air conditioning system. Note: Most, but not all, manufacturers have the cooling fan system designed to come on when the air conditioner is turned on.

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.

Why do I have a GM 3 relay fan?

I try to show people how they can diagnose, fix and repair things themselves, grow their own food and preserve and store it. I strive to do something everyday to become more self sufficient; to be closer to my food, spend more time with my family.

Why is my radiator cooling fan not working?

The radiator cooling fans will not come and it causes overheating. It may be the fan relay or switch (whatever it is called). My problem is trying to locate it. Is it near the battery or where is it so I can install the one sold to me by Autozone automotive parts store.

Where is the radiator fan high relay located?

For High Speed – Power from fuse 12 provides power to the Radiator Fan Control Relay, power from fuse 15 provides power to the Radiator Fan High Relay. Based on PCM operating parameters received over the CAN-C BUS the TIPM turns on the Radiator Fan Control Relay, which exits the TIPM and powers the right fan motor.

Where does the power from the cooling fan relay come from?

Power is supplied to the left fan through cooling fan relay #1 and is grounded through the Mode Control relay. The right fan is powered directly through cooling fan relay #2 causing both fans to operate at high speed. helpful? The fans are always running on low when they do come on.

Where is the fan relay on a RT Charger?

I have a 2008 RT Charger. Need to replace the coolant fan relay. The owners manual only lists the fuses. Anyone know where the relay is located? Thanks There’s more than one fan relay, here’s the TIPM (underhood fuse block) diagram. What is it doing? The relays themselves aren’t a common failure. Usually it’s the fan motors themselves.

What to do if your cooling fan relay is failing?

For this reason, if you suspect that your cooling fan, or relay, may possibly be having issues, have the vehicle diagnosed by a professional technician, such as one from YourMechanic. They will be able to look over your vehicle and replace your cooling fan relay if necessary.

Where does the cooling fan in the engine go?

The cooling fan in the engine compartment should turn on to pull air through the radiator and A/C condenser. A main cooling fan for the radiator. A second fan for the condenser.

Why do I need to check my cooling fan relay?

The cooling fan relay essentially functions as the switch for the engine’s cooling fans; and is therefore an important electrical component of the vehicle’s cooling system. Finally, if you suspect that your cooling fan relay, may possibly be having issues, have it checked.

Can a radiator fan and condenser fan share a relay?

There are, however, some models that use a dedicated second unit to the condenser. In such a scenario, the condenser fan and radiator fan may or may not share the same relay. If the cooling fan does not engage, you can check whether the relay is to blame by swapping it out for a different relay.

The cooling fan in the engine compartment should turn on to pull air through the radiator and A/C condenser. A main cooling fan for the radiator. A second fan for the condenser.