Q: O2 Sensor

A stalling vehicle when the AC or Defroster is activate indicates a problem with the compressor. It is either seized/hard to rotate or the AC refrigerant is overcharged preventing the compressor from turning. This will also put increased load on...

Hello. If the system continually blows hot and then cold, this is typically caused by a failing blend door actuator. If it fails, it can allow the temperature door to not hold the right position. It can also be caused...

When a car turns and won't start, it is called a "crank no start". When this occurs, the first thing you need to do is see what is missing. All internal combustion motors need spark, fuel, injector pulse and camshaft...

Thanks for writing in about your Hummer H2. Let's cover the basics of diagnosing a overheating issue. First, verify the actual temperature at the thermostat housing. Cooling system (and cap) has probably been pressure tested by now. If it tends...

Hi there. This is a mount problem. It is very common for the engine mounts (https://www.yourmechanic.com/services/engine-mount-replacement) to fail on a Mazda Premacy and still visually look good. I always remove them to physically check them for damage and wear. It...

There are several possible causes that keep a vehicle from starting. It would first be necessary to find out what the root problem is, meaning, for an engine to start and run, it needs fuel, air, and spark. To find...

If your starter is just clicking when it is cold outside then you either have a defective starter, or you have an issue with the battery. If the battery voltage is low enough then the vehicle will do this. I...

Hello - check fluid level in the transmission, and for problem code, whether the Check Engine light is one or not. I suspect it will be. This sounds like a failure internal to the transmission, clutches (https://www.yourmechanic.com/article/does-an-automatic-transmission-have-a-clutch), valve body or...

Hi there. Unfortunately, it's possible that your husband was correct about the cracked head gasket, but using a liquid "stop leak" product most likely made it worse. What likely occurred is whatever substance that was used to resolve the head...