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Jim Grant Tech Tips Jim Grant Tech Tips
A collection of helpful articles based on reader submissions
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Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by users over the course of many years.
If you have any questions, please feel free to email us.



Lincoln - Mercury
  Jim Grant's Tech Tips

'00 Honda Civic, Frosting Windows

Q: I own a ‘00 Honda Civic. One particularly cold night, the defroster could not work fast enough. While I was driving with the defroster on, the car fogged up terribly. It was so bad, that I let it run after I arrived home because I was heading back out within minutes and I wanted the windows clear. When I came out, the fog was gone but the windows moist (condensation). I drove to the gym and when I came out 45 minutes later - there was frost on the inside of the windows. It was so dense, it required scraping! I've never had to scrape the inside of my car before. What would cause these problems? The car has only 27k miles.

A: Check the heater controls to see if you have the recirculate mode selected. The heating and ventilation systems on most vehicles have two air modes, fresh air and recirculated air. The fresh air mode allows the ventilation system to pull in outside air to be heated or cooled for the passenger compartment. The recirculate mode does what the name indicates, cabin/inside air is used and to heat or cool. There would be no problem with that if you didn’t breathe. We humans expel a lot of moisture and inside a vehicle this moisture turns into condensation. Condensation just loves to collect on cold glass surfaces. During winter operation it is best to induce outside air to the ventilation system to aid purging moisture from the passenger compartment. As the weather warms that’s a different story for another time.

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