You really can't mix them up. If you switched them on the heater core, it will still work. Are both heater core hoses getting hot?
January, 17, 2013 AT 6:38 PM
Yes the both get warm but inside the cab it doesnt heat above room temp.
January, 17, 2013 AT 6:55 PM
If they both get hot, that tells me the heater core is flowing. Thus, you should have heat. If you don't, chances are the blend air door isn't operating. It is near the heater core and opens and closes based on if you want heat or AC.