WHAT SHOULD I DO NO HEAT FAN BLOWS ON AC BUT DO ...

  • Tiny
  • Anonymous
  • 1979 Ford F-150
  • 97,704 miles

What should I do no heat fan blows on ac but do not blow heat when you turn on heat

Monday, February 11th, 2013 AT 12:56 PM

1 Answer

  • Tiny
  • hmac300
  • Expert
  • 41,673 posts

Check to see if both heater hoses are hot. It may be a bad water valve not letting heat go through to heater. Check for a vacuum leak also check for a bad blower relay and check behind switch it may be burnt up when put on heat.

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Monday, February 11th, 2013 AT 3:17 PM

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