Skip the auto shop - Our mechanics make house calls

Q: Electrical system issues and transmission problems

asked by on

I have a high-mileage vehicle with over 230,000 miles on it and it's been having several issues lately. One of the issues is with the AC that starts blowing warm all of a sudden. After I wait about 15 seconds and restart the car, it gets back to normal. There is also this bumping noise while changing from first gear to second gear. The power windows and door locks are malfunctioning as well. All these issues disappear after the car is restarted. There are other electrical issues that wouldn't go away with the restart of the car, including the radio playing after I turn the engine off and the gauges of the instrument cluster that are not working correctly anymore. Also, after I turn the engine off completely, the radiator fan would work for several hours. Do you have any idea what the cause of these issues is? Could it be fixed? Thank you.

A: Hello. If all of these issues started at th...

Hello. If all of these issues started at the same time then it is an electrical issue. From what you are saying it sounds like you have a bad ground connection on the negative battery cable or a failing ignition switch which is causing a loss of power to these circuits. I typically check these first. If they are fine then I test each circuit as it can be a short in the fuse box or some damaged wiring. The bump that you hear is usually from the output shaft of the transmission. There is a bushing in the tailshaft that needs to be inspected for wear. It is usually the issue. If you need to have these problems checked out, consider YourMechanic, as a certified mechanic can come to your home or office to inspect the cause of the issue.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: Weird electrical problem

Hello, thank you for writing in. The electrical circuits that relate to both of these systems are crossing at some point. This may be an issue with the body control module, the fuse box, the bulbs, or the electrical wiring....

Q: Door making noise

Hello. The door hinges to your right door are loose or detaching from the body of the car. I suggest that you stop use of the right door until you can get the problem fixed. The best place to take...

Q: Car runs hot

On some of these engines, the idler, or tensioner pulley, tends to go bad and throws the belt. However, it could be that your belt just broke from age and wear, or another problem caused the belt to break or...

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 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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...