How do you Test your Volvo XC90 Cooling Fan Relay

How Do You Test Your Volvo XC90 Cooling Fan Relay?

To keep the engine temperature stable, modern cars employ liquid-cooling systems.

It works by continually circulating coolant between the engine and radiator.

The coolant absorbs heat from the engine and moves to the radiator to dissipate it.

The cooling fan, when activated facilitates the heat exchange process.

Its operation is controlled by the ECU employing a relay.

What’s a cooling fan relay and what does it do?

It’s an electromagnetic switch that regulates the cooling fan operation.

It’s of the following kinds:Open relay- has an open armature Closed relay- here armature is closed Dual relay- has both open and closed armatures

Where is the coolant fan relay located?

In general, you can find it in the engine compartment.

In some cases, it sits next to the coolant fan assembly.

Symptoms of a bad cooling fan relay in Volvo XC90

Car keeps overheating

An overheated engine is by far the most obvious sign of a bad cooling fan relay.

So, if the temperature gauge is reading high, consider inspecting the cooling fan relay in your car.

If the relay has some technical flaws, get it replaced right away.

Cooling stops working

As we discussed earlier, the operation of the cooling fan is regulated by a relay.

If the relay stops working, and so does the cooling fan.

Cooling fan keeps running

The cooling fan is supposed to stop working once the engine attains optimal temperature.

However, if it stays on, there’s a chance that you have a bad cooling fan relay.

Blinking warning lights

A faulty cooling fan relay can turn on one or both of the following warning lights:Check engine light Temperature warning light

Volvo XC90 cooling fan relay failure- Causes

Listed below are a few reasons why the cooling fan relay of a vehicle may fail:Defective controller Electric short-circuit Blown fuse Installation error Wiring issue

How to test a cooling fan relay?

First locate your Volvo XC90’s cooling fan relay.

Then, measure its resistance.

The resistance of a normal cooling fan relay stays between 40 to 80 ohms.

Wrapping Up

A faulty cooling fan relay can make your car’s engine run hot and abruptly cease operation.

So, get it replaced on time.

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