Skip the auto shop - Our mechanics make house calls

Q: The engine is off, radiator fan still works, AC issues

asked by on

Hello. I purchased a previously owned Mazda 5 and there are some issues with it that I wasn't familiar with when I bought it. When the key is in the on position, the radiator fan wouldn't quit working. This happens even though the engine is off. If I turn the AC on, then the raditor fan would go off. I took the car to the dealer and was told that there was a raditor fan replacement and that during that repair, the wires were connected differently than they should be. I was told that I needed a new fan controle module. That didn't help however. Another issue is with the AC, which doesn't work well, esepecially while driving at town speeds, whereas it works great at highway speeds. The previous owner says the AC works fine. The compressor was replaced by a new one along with a new pressure switch, according to him. Do you have any idea how I could fix these issues? Thank you.

A: Since the wiring system has been modified a...

Since the wiring system has been modified and the fan wired hot at all times with the key on. I recommend having a mechanic diagnose the real problem with the wiring since it may be an issue with the internals of the body control module, it's not turning on the cooling fan relay module. This would need to be scanned to diagnosed.

The A/C blows warm since the fan may have stopped working and the A/C was not charged enough or too much. It may have lost some charge also which is another thing which needs to be checked.

If you'd like to get this fixed, get assistance from a professional mechanic who can perform the necessary steps to diagnose your AC problem. Once this is done, an accurate repair can be made.

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: Sedan vs Hatchback parts

Matching parts in this manner can be problematic and is really best suited for a parts store that specializes in body parts. Wrecking yards often have these kinds of parts in stock and should be able to cross reference part...

Q: Sputtering issue with car

Code P0301 stands for cylinder #1 misfire. There are numerous potential causes for this code and your symptoms. If that is the only code stored, you'll want to focus on items specific to the #1 cylinder, such as the fuel...

Q: Whooping noise when brakes are applied

Try rotating the tires to see if the tires have a small flat spot. If the noise moves to the front then replace the tires. If the noise stays in the back then have the brake rotors resurfaced or replaced...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.