no heat out of the vent?

MouseOnJuice · 02-01-2004, 03:44 PM

not sure where to put this, but i've got a 1973 merc marquis. air doesn't blow out of the front vents no matter what the control lever is selecting. clear across the selector the heat acts as if it is on defrost, and never changes until its in off position. defrost, hi-lo, vent, heat, all blow out the top window vents. hi, med, lo, switch works, the floor vents blow, but nothing out of the front vents. does this sound electrical, or vacuum related to you guys?

rwhite65 · 02-03-2004, 03:48 AM

can u look up under the dash? My 65 is very simple, cable to a little flapper door.....not sure on the 73, but worth a try to see if maybe the cable came un-hooked.
Ryan

MouseOnJuice · 02-03-2004, 03:00 PM

l figured out the problem, thanks for the input though, the vacuum supply line off the manifold tree had a small leak in which l detected with propane, it was just enough to not allow the diaphragm to open enough

thanks

02-01-2004, 03:44 PM	#1
MouseOnJuice Registered Member Join Date: Jun 2001 Location: Arlington Heights Illinois Posts: 13	no heat out of the vent? not sure where to put this, but i've got a 1973 merc marquis. air doesn't blow out of the front vents no matter what the control lever is selecting. clear across the selector the heat acts as if it is on defrost, and never changes until its in off position. defrost, hi-lo, vent, heat, all blow out the top window vents. hi, med, lo, switch works, the floor vents blow, but nothing out of the front vents. does this sound electrical, or vacuum related to you guys? __________________ 1987 Camaro SC ZZ4 350 New Comp Roller Cam .510/525 Speed Demon 4 bbl Rebuilt 700 R4 (heavy duty clutch bands, TransGo shift kit, etc.) 2,500 RPM precision industries converter SLP headers, 3.5 inch exhaust all the way to the Dynomax muffler 3.73 richmond ring and pinion 7.5 inch 10-bolt Hoosier slicks Stock ZZ4 ran me a 12.8 @106 MPH soon to find out with new cam.... 1973 Mercury Marquise Split-Pea-Soup-Green, white vinyl top 429 Thunder Jet True Duals, 2 1/2 cherry bombs

02-03-2004, 03:48 AM	#2
rwhite65 Ride Hard Join Date: Oct 2000 Location: Wyoming IL Posts: 1,094	can u look up under the dash? My 65 is very simple, cable to a little flapper door.....not sure on the 73, but worth a try to see if maybe the cable came un-hooked. Ryan __________________ 65 Fastback 91 roller 306, H/C/I AOD-Bauman, PI Stallion, 4.10's and traction loc 04 Grand Cherokee Freedom Edition 79 Ford F-250 4x4 - Restored

02-03-2004, 03:00 PM	#3
MouseOnJuice Registered Member Join Date: Jun 2001 Location: Arlington Heights Illinois Posts: 13	l figured out the problem, thanks for the input though, the vacuum supply line off the manifold tree had a small leak in which l detected with propane, it was just enough to not allow the diaphragm to open enough thanks __________________ 1987 Camaro SC ZZ4 350 New Comp Roller Cam .510/525 Speed Demon 4 bbl Rebuilt 700 R4 (heavy duty clutch bands, TransGo shift kit, etc.) 2,500 RPM precision industries converter SLP headers, 3.5 inch exhaust all the way to the Dynomax muffler 3.73 richmond ring and pinion 7.5 inch 10-bolt Hoosier slicks Stock ZZ4 ran me a 12.8 @106 MPH soon to find out with new cam.... 1973 Mercury Marquise Split-Pea-Soup-Green, white vinyl top 429 Thunder Jet True Duals, 2 1/2 cherry bombs

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