Q: My engine management light is on all the time and so are my engine fans.

asked by on February 22, 2017

My engine cooler fan is on all the time, temperature gauge just moves up and down when it feels like it I've change both temperature sensors, I've change the thermostat, the top sensor had a adui A4 plug on it so ive changed that back to the plug that suposed to be on it but to be honest I think it's got worse, is there any one who can help me with this

My car has 117 miles.
My car has a manual transmission.

Hello. The engine fan coming on and the temperature gauge spontaneous movement is more than likely caused by the same issue. It is possibly a wiring issue with your coolant temperature sensors. A technician will have to check the wiring of the coolant temperature sensors by tracing them from the temperature sensors to the temperature gauge. There is likely some sort of abrasions or short circuiting in your wiring which is causing temperature gauge to act erratically.

You can find a technician and schedule an appointment for you heating and cooling issue here

https://www.yourmechanic.com

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing


Experienced Mechanic?

Earn up to $70/hr

What others are asking

Car shaking and misfiring

Hi. The first thing to do is check the codes stored in the engine computer (https://www.yourmechanic.com/services/check-engine-light-is-on-inspection). If the engine is indeed misfiring, codes will be stored. The source of the misfire will need to be identified, possible faults include a...

Leaking brake fluid

Hi there. A brake fluid leak can cause some serious problems. If it is leaking and getting the wheel wet, then most of the time the problem is the caliper. It can also be the rubber hose going to the...

Speedometer not working in a 2004 Chrysler PT Cruiser

There may be a wiring issue in the speedometer circuit, or the gauge in the instrument cluster may be bad. I would ask for help from one of the mechanics at YourMechanic to help diagnose and repair your speedometer concern...

Sway bar broken

If the sway bar is broken I would recommend having the sway bar and/or sway bar links replaced (https://www.yourmechanic.com/services/stabilizer-bar-links-replacement). The sway bar keeps the vehicle level during turns and prevents either side from dipping in while turning. This improves the...

I got 2 codes P0304 and p0102

Hi there: The OBD-II trouble code P-0304 (https://www.yourmechanic.com/article/p0303-obd-ii-trouble-code-cylinder-3-misfire-detected-by-spencer-clayton) indicates that cylinder four is misfiring or having ignition issues. The most common causes include a faulty spark plug, clogged fuel injectors, or even an intake valve leak. To know for certain,...

Tire pressure warning system lights up because i used a nonsensored valve.

The tire pressure monitoring system (TPMS) is an integrated system that cannot be disabled. When you did not install a correct tire pressure sensor and installed a regular valve stem the TPMS senses the missing sensor and turns on the...

Would like to put a 2JZ Twin Turbo motor in my 2013 Scion tc

Hi there. You'll be better served to contact a local speed shop that specializes in completing Scion performance upgrades to see whether or not this is possible and if they're able to offer suggestions and advice on how to complete...

In my 07 Jeep Liberty, the coolant tank is empty. Should I add coolant to the tank or check the level in the radiator?

You'd better just wait until it cools off so that you can look in the radiator. Filling the reservoir will not help in an overheating situation. It may take an hour or two for the engine to cool off enough,...

Throttle body re-learn

As you may know, after cleaning or replacing the throttle body your car needs to go through a "re-learning" process to bring the idle back down. Try doing the following which should bring the idle back down to a normal...

Related articles

A Buyer’s Guide to the 2012 Volkswagen Passat
Redesigned Redesigned for American buyers, the 2012 Volkswagen Passat is roomier, has more standard features, and costs less than previous models. All that, and you still get everything you look for in a German-built sedan, including the on-road dynamics, power,...
The Best Used Cars to Buy for First Time Car Owners
Owning Owning your very first car is an exciting time in a person’s life. Likely you want to put a lot of thought and research into the process to ensure you get something that meets your needs, is fun to...
How to Replace a Fuel Gauge Sender
The fuel gauge has a sender that goes bad when it says that the fuel level is different lower or higher than it actually is.