Skip the auto shop - Our mechanics make house calls

Q: Heated windshield not working.

asked by on

The heated rear windshield is not working. Also, when I take the car through the car wash, the passenger's side floorboard gets flooded.

It appears that you may actually be experiencing two different issues with your Mustang. I do not believe the two are related so we will look at each concern independently. In regards to the rear window defroster, it is quite possible that you may have just blown a fuse.

If it can be verified that the fuse is fine, then the next place we will want to look will be the lines on the rear windshield glass. Those lines are actually heat wires hooked up to the electrical system. When power runs through them, they heat up, remove the fog from the window. Over the years these wires can lose proper connection. This is often through the abuse of the sun beating down on them or possibly an object made contact and created a break in the connection. Due to this failure being an electrical issue, I highly recommend enlisting the help of a certified mechanic to diagnose and repair this window issue to avoid any other electric failure.

In regards to the passenger side flooding while going through a car wash, I have actually found this to actually be quite common. It is found in the newer Mustangs and the fix for this is simple. There are grommet seals that go under the windshield and these seals hold the cowl (a plastic piece found under the front windshield which covers the wiper motor system as well as housing the fresh air for inside the cabin of the vehicle) in place. What you are experiencing is when these seals go bad. Ford sells an updated seal to correct this issue and the new seals require heat to be applied for a proper seal. While the repair itself is not too difficult, it does involve removing the cowl to gain access. A certified mechanic can also assist you with this procedure and get your Mustang’s defroster and seal concerned taken care of quickly.

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

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: Overheating

When you put pressure in the radiator you are only going up to about 15 psi, but when a cylinder fires, it puts out a lot more than the compression test showed at 125 psi. This is why you are...

Q: No more engine oil 2005 Ford Mustang

Hello - If you have lost all the engine oil through the oil pan, there is no doubt broken internal engine damage. Most likely, this is a broken connecting rod or piston. Attempting to restart the engine would be difficult...

Q: Squeeking noise coming from front driver-side tire only

It is possible you have worn brake pads and the sensor is telling you the pads are worn down too far. Since you also had an ABS light come on you may have a bad bearing and sensor in that...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...