1991 q45 no heat

[bpeesy]

I have a 1st gen 91 Q45. The problem I am having is no heat. The A/C blows nice and cold. When I switch to heat, the heater will not come on or will only continue to blow cold air. I have checked all fuses and heater hoses. does anyone have an idea what I should check or replace next? Thank you all for any replies in advance.

[elwesso]

perform a search for heater mix doors, blend doors, etc..... that could be your problem..... Self diagnosis can sometimes help this too.