The operation of your Volvo XC90's cooling fan is regulated by a relay. If the relay fails, it would make your car's cooling system inefficient, causing the engine to run hot and abruptly cease operation. So, you have to replace it on time.

1. How Do You Test Your
Volvo XC90 Cooling Fan
Relay?

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

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

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

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

6. Its operation is controlled
by the ECU employing a
relay.

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

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

9. 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

10. Where is the
coolant fan relay
located?

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

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

13. Symptoms of a
bad cooling fan
relay in Volvo
XC90

14. Car keeps overheating

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

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

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

18. Cooling stops working

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

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

21. Cooling fan keeps
running

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

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

24. Blinking warning
lights

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

26. Volvo XC90
cooling fan relay
failure- Causes

27. 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

28. How to test a
cooling fan
relay?

29. First locate your Volvo XC90’s
cooling fan relay.
Then, measure its resistance.

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

31. Wrapping Up

32. 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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