Windshield fogs up to the point of zero visibility when defrost is on

Tiny
KEZIA HANNAN
  • MEMBER
  • 2003 FORD EXPEDITION
  • 5.4L
  • V8
  • 4WD
  • AUTOMATIC
  • 192,000 MILES
Before the fogged windshield issue started, there was a clicking noise from the dash area when I purchased this vehicle through private party. After some inquiring and searching I came to the conclusion it might be the blend door actuator. Before I could fix the actuator, I noticed one day the clicking had stopped. Later that evening when I turned defrost on my windshield became fogged up to zero visibility and luckily I was not far from home. I turned around back to house and decided to get actuator the next day hoping that was going to fix the issue. I put the blend door actuator in myself, all back together but the problem still occurs. I then noticed I was extremely low on antifreeze so I filled the tank, and while doing so noticed the seal missing on the cap. So I replaced that. Talking to the folks at Central Point O'Rielly's Auto Parts store, they suggested possibly replacing the thermostat. So now, I have replaced the blend door actuator, the cap on the pressurized overflow tank, the thermostat, filled it with antifreeze and still have the same issue. I notice also that the passenger side barely starts to defrost eventually. And the smell of antifreeze is almost unbearable when defrost is on. Please help. I cannot afford to bring it in or I would! Any ideas on what could be the problem?
Sunday, January 1st, 2017 AT 1:11 PM

2 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
You will have a leaking heater core, there is nothing else to do but remove the heater box and fit a new heater core. Do not use stop leaks as this will cause more problems than you have already.
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Sunday, January 1st, 2017 AT 2:16 PM
Tiny
RENEE L
  • ADMIN
  • 1,257 POSTS
Hi KEZIA HANNAN,

Here is a link to an article from this site that has the information you need to replace your heat core. This article features well written step by step instructions and photographs.

https://www.2carpros.com/articles/replace-heater-core

If you need further assistance please come back to the site. We are here to help you.

Kindest regards,

Renee
Admin
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Tuesday, January 3rd, 2017 AT 6:25 PM

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