When the heater is on my windshield gets fogged up

2000 DODGE RAM
213,000 MILES • 5.2L • V8 • 2WD
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ARTHUR MATHEWS
  • MEMBER
  • 2 POSTS
I turn heater on and my windshield fogs up every time.
Oct 14, 2016 at 12:11 AM
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AL514
  • ✓Experienced Mechanic
  • 5,676 POSTS
sounds like the heater core is leaking into the car. this will usually always fog up the windshield and or leak on the floor under the dash. But, it may just be a minor leak to begin with.
Oct 14, 2016 at 12:38 AM
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ARTHUR MATHEWS
  • MEMBER
  • 2 POSTS
Nothing wet under the dash or on the carpet.
Oct 14, 2016 at 5:01 AM
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AL514
  • ✓Experienced Mechanic
  • 5,676 POSTS
it may be only a small leak at this point, as you turn your heater on coolant flows threw the heater core and you get the fog up effect. Honda's do it all the time also. same situation.
Oct 15, 2016 at 4:41 AM
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