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.

A: It appears that you may actually be experie...

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

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・Save up to 30%

Get a quote

What others are asking

Q: All warnings lamps are shawn in dashboard, and the gauges the acceleration and rpm are on 0 , also

It sounds like you may have a dashboard integration unit failure, or a fault within the electrical control unit (ECU). It's also possible that the instrument cluster itself is faulty. Have the vehicle scanned for diagnostic trouble codes (DTCs)...

Q: AC Squeaking/not blowing as hard.

Hi there, thanks for writing in. I'd be happy to help. What you are hearing is the blower motor in the dash bearing going bad, likely from not having lube in the bearing. You may need to replace the blower...

Q: How do you calibrate the compass in a 2012 Ford Escape?

Your car’s electronic compass can provide important directional information, but it can also be thrown off by passing through strong electrical fields, strong magnetic fields, exposure to strong radio signals and more. If it’s thrown off, you’ll need to recalibrate...

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...
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...
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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...