Skip the auto shop - Our mechanics make house calls

Q: Fans out and radiator leaking

asked by on

My cooling fans are not working and the radiator is leaking.

A: Hi. There are two engine cooling fans in yo...

Hi. There are two engine cooling fans in your vehicle: a high and a low speed. The body control module (BCM) sends requests to the powertrain control module (PCM) for fan operation. The powertrain control module (PCM) then grounds the fan relays to turn on the fans. This takes place when engine load or temperature is excessive. The engine coolant temperature (ECT) sensor and A/C pressure sensor are the main signals monitored by the modules for fan control. Inoperative cooling fans(s) could be the result of a problem with the fan motor, relay, wiring, ECT, A/C pressure sensor or ECUs. A trained technician, such as one from YourMechanic, will be able to diagnose your fans for you. They will also be able to perform a cooling system pressure test to pinpoint the location of your coolant leak.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Knocking noise from engine and loss of power

The illumination of the check engine light means that diagnostic trouble codes were set during this incident. The codes are probably "related" to the knocking noise. If there was a mechanical failure in the engine, these codes could have simply...

Q: Abs speed sensor

The problem is with the X5 wheel speed sensors - likely the hub bearing and not the sensor. The sensor reads the magnetic encoder that is implanted in the hub bearing to determine wheel speed. If the hub bearing is...

Q: Fan doesn't work and engine steams.

Hello, sometimes if the water leaks out of the engine it creates an air pocket in the engine and that trapped air can not escape and will not let the water circulate. This causes some problems. if there is air...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...