Originally Posted by GRUNTERSDAD
2005 Mercury Sable, very low mileage. Temp gauge reads normal but I have no heat/defroster etc. Fan works, but blows ambient air. thanks
1st check your antifreeze level. If full,Engine at operating tempersture touch the 2 heater hoses that go thru the firewall (passenger compartment). They should both be really warm (even hot) so be careful.
If they are coldish , you have a restriction somewhere in the cooling system , and if they are warm/hot , you have a door problem inside the dash.