WHAT SHOULD I DO NO HEAT FAN BLOWS ON AC BUT DO ...
1979 Ford F-150
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
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.