MustangWorks.com : Ford Forums - View Single Post - over heated engine and heater blows cold air

91LX2Bfast · 02-05-2004, 09:41 AM

Humm... it's strange that the car is overheating yet the heater is blowing cool air.
I blew 5 heater cores in my last '97 Tbird (don't ask

Ford crap ) and it did have similar symtoms. So I agree with blake in that it could be a possibilty. Except when mine blew, I got "green" steam coming up behind the dash onto the windshield and coolant would run down all over the passanger side floor. So it wasn't hard to diagnose to say the least.
Another theory: As with most pre-'99 3.8's, headgasket failure is always a possibilty. That can and does cause overheating problems. As far as the cool heater air?????: Maybe if enough air is getting into the lines, maybe it could be building up in the heater core? Then there wouldn't be enough hot coolant to heat up the air?

02-05-2004, 09:41 AM	#3
91LX2Bfast Registered Member Join Date: Dec 1999 Location: Warrington, PA Posts: 694	Humm... it's strange that the car is overheating yet the heater is blowing cool air. I blew 5 heater cores in my last '97 Tbird (don't ask Ford crap ) and it did have similar symtoms. So I agree with blake in that it could be a possibilty. Except when mine blew, I got "green" steam coming up behind the dash onto the windshield and coolant would run down all over the passanger side floor. So it wasn't hard to diagnose to say the least. Another theory: As with most pre-'99 3.8's, headgasket failure is always a possibilty. That can and does cause overheating problems. As far as the cool heater air?????: Maybe if enough air is getting into the lines, maybe it could be building up in the heater core? Then there wouldn't be enough hot coolant to heat up the air? __________________ '97 T-bird LX 4.6L 2V, auto SVO heads/intake, Vortech T-trim, front mounted intercooler, blower cams, Cobra crank, Manley H-beam rods, JE pistons, Aeromotive fuel system w/ 42# injectors, and much more No times yet