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mpj76 · 10-28-2005, 08:28 AM

Does it do it with your climate control fan off also? My guess is that during high RPM's your cooling system is under higher pressure and causing your heater core to start to leak. A leaking heater core will manifest itself itself as smoke coming out of the vents. Adjust your climate control to blow on your windshield only to see if the location of the smoke changes. If the core is leaking, it will fog up your windshield. It doesn't smell like coolant does when you stick your nose to it. Wiping it with a rag will yield a greasy streaks. Happened to me.

10-28-2005, 08:28 AM	#3
mpj76 Registered Member Join Date: Sep 2002 Posts: 158	Re: Smoke Blowing Through The Vents! Does it do it with your climate control fan off also? My guess is that during high RPM's your cooling system is under higher pressure and causing your heater core to start to leak. A leaking heater core will manifest itself itself as smoke coming out of the vents. Adjust your climate control to blow on your windshield only to see if the location of the smoke changes. If the core is leaking, it will fog up your windshield. It doesn't smell like coolant does when you stick your nose to it. Wiping it with a rag will yield a greasy streaks. Happened to me. __________________ 91 Coupe: FMS 1 5/8 unqual shorty's, BBK off road X-pipe, Super Duty T5, Pro 5.0 short shifter, 2.73 rear, G3 alt, MSD coil, dist, no smog pump, oil cooler, 195K miles, 14 deg timing, 23 mpg city/29 mpg highway @ 65 mph.