Can't Control Heater & Defroster
courtesy of Bob, The Auto Answer Man
I have a 1996 jeep Grande Cherokee and my problem is when you accelerate hard and have the heater on it automatically switches to the defroster. After you let off the gas it then switches back. I hope you can help me and thanks for your time.
The direction of air flow on most cars is controlled via vacuum. Upon hard acceleration the engine's vacuum drops. This may be causing the car to go to default heater control (which is probably defrost). There may be a leak or a crack in a hose or a bad vacuum diaphragm that controls the air flow.
Bob, The Auto Answer Man
Have a car care question? Visit our automotive center and see if we've already answered it or a similar question.
Take the Next Step
- Reduce the cost of your gasoline with a 'gas card'. You can compare them here.
Also in Auto
- 5 common ways you are killing your car
- 7 smart steps to switching your car insurance
- The true cost of not maintaining your car
- 5 DIY tips to save money on auto-body repairs
- 5 ways to avoid overpaying for car repairs
- Replace 5 car parts for better gas mileage