Q: 4 wheel high wont work, 2 wheel and 4 wheel low will. 1997 GMC Sierra Electronic shift (of course). Replaced the front axel actuat

Hello. This comes up often on this engine. If the housing for the water pump is leaking, then the water pump needs to be replaced (https://www.yourmechanic.com/services/water-pump-replacement). Most of the time the water pump housing does not leak on this engine,...

Your navigation system will likely have to be replaced as the system is non serviceable. This issue will require dealer level diagnostic equipment to diagnose the issue and to reprogram a new unit if necessary.

Hey there: The problem you're having with your GMC Envoy stalling (https://www.yourmechanic.com/article/how-to-keep-your-car-from-stalling-by-robert-tomashek) could be caused by all or one of the components you've mentioned in your question. A dirty fuel filter (https://www.yourmechanic.com/services/fuel-filter-replacement) will restrict the flow of gasoline to the...

Synthetic oil (https://www.yourmechanic.com/article/can-you-switch-between-regular-and-synthetic-motor-oil) is primarily designed for high performance driving and high mileage driving, although it will not hurt your vehicle at all. The 10% dash light is an indicator that is measured by the amount of mileage in between...

Hello. Though the shift interlocking system does have an input from the ECM, I have never seen one fail and cause this. Most of the time, this is caused by a bad brake pedal switch or a shift lock solenoid....

Hello. It is impossible to identify a rattling noise without pinpointing the location in which it is coming from. The brakes typically do not make a rattling noise. Usually the brakes make a grinding noise of some kind. The steering...

Hello. From what you describe it would appear that your vehicle is experiencing two separate issues. Problems with the heater can be caused by a few different things. The first thing I would check is to make sure that the...

You may have a bad window switch or motor and regulator. You will need to have it tested for power to motor in the door. If it has power then replace motor.

If the tires are new (and not defective) and have uniform air pressure (i.e., exactly the same pressure on left and right side of vehicle), a possibility is the wheel alignment is off with the specific issue possibly too much...