Heater blower fan
08-03-2016, 09:40 AM
#1
8th Gear
Thread Starter
Heater blower fan
I have a 76 Corvette.The heater blower fan has good output.It is weak inside but is blowing out on the right side at fire wall.What could this be?
08-03-2016, 10:26 AM
#2
Team Owner
How do you know the heater blower fan has good output? Does the fan work in all three speeds?
They changed the dash between my car's year (1970) and yours, so I don't know if this will work for you, but I can take the right side dash panel off in less than 10 minutes. This does not give me a good view of the blower motor, but I can see a fair amount of the duct work. That is where I would start.
They changed the dash between my car's year (1970) and yours, so I don't know if this will work for you, but I can take the right side dash panel off in less than 10 minutes. This does not give me a good view of the blower motor, but I can see a fair amount of the duct work. That is where I would start.
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Mike56 (08-04-2016)
08-03-2016, 11:06 AM
#3
8th Gear
Thread Starter
I have had the right side dash out.all seems to be working ..But it still leaks into engine compartment.I get weak air flow inside but a strong leak behind a/c box..
08-03-2016, 11:19 AM
#4
the glove box interior comes out with removal of 6 short phillips head screws..3 top front, 3 bottom front, one each side..Then the lamp & lite socket.
Behind the glove box is a bypass valve that has a cable going to it from your temp control lever under hvac console ..Sounds like the cable isn't fully actuation the bypass solenoid and operating the vent dampers for proper air flow.. The cable is adjusted pretty simply by removing r/s console carpet-board and turning the turnbuckle until with temp all the way cold and fan on hi with max A/C selected, the two vacuum hoses that go to bypass solenoid valve are enabled..Jim
http://www.c3vr.com/member_uploads/1...l-system-2.jpg
Last edited by jim in oregon; 08-03-2016 at 11:21 AM.
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Mike56 (08-03-2016)
08-03-2016, 11:32 AM
#5
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08-03-2016, 11:54 AM
#6
yep..my error...his '76 does have a heater shut off valve in line in heater hose I believe..but he has a 2 port diverter vac solenoid .Think the air deverter shtters in the ductwork are not getting proper 'signals'..Jim
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Mike56 (08-03-2016)
08-03-2016, 01:10 PM
#7
8th Gear
Thread Starter
Thanks,
Mike56
Last edited by Mike56; 08-03-2016 at 01:12 PM.
08-04-2016, 12:13 PM
#8
8th Gear
Thread Starter
How do you know the heater blower fan has good output? Does the fan work in all three speeds?
They changed the dash between my car's year (1970) and yours, so I don't know if this will work for you, but I can take the right side dash panel off in less than 10 minutes. This does not give me a good view of the blower motor, but I can see a fair amount of the duct work. That is where I would start.
They changed the dash between my car's year (1970) and yours, so I don't know if this will work for you, but I can take the right side dash panel off in less than 10 minutes. This does not give me a good view of the blower motor, but I can see a fair amount of the duct work. That is where I would start.
08-04-2016, 12:15 PM
#9
8th Gear
Thread Starter
Hi Jim..The doors seem to be operating fine..It did have a/c but was removed..evaporator is still there in a box beside the blower..seems to be a leak coming from between the fire wall and the box.is there a gasket or something that may be wore out at that point?And is the another door in that evaporator box?
Thanks,
Mike56
Thanks,
Mike56
Last edited by Mike56; 08-04-2016 at 12:15 PM.