Rear Heater Blower Motor, Do I have an odd blower? |
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Rear Heater Blower Motor, Do I have an odd blower? |
LotusJoe |
Feb 21 2012, 06:25 PM
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#1
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Europa Twink Driver Group: Members Posts: 406 Joined: 30-November 09 From: Southern California Member No.: 11,085 Region Association: Southern California |
I'm installing the rear blower motor. Mine only as one outlet. I'm assuming this is because it had air conditioning.
The parts book only list one blower motor, but it has two outlets, although the parts number on my blower matches the one in the parts book. (IMG:style_emoticons/default/confused24.gif) 914 rubber shows a blower with two outlets as well, but different from the parts book?? |
SLITS |
Feb 21 2012, 06:35 PM
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#2
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None |
The early cars had a two outlet blower which Porsche/VW deemed not necessary. The went to the single blower and fed one HE.
There is a splitter that attaches to the blower in place of the plastic nozzle that will allow you to run hoses to each HE, which is your bottom image. |
LotusJoe |
Feb 21 2012, 07:01 PM
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#3
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Europa Twink Driver Group: Members Posts: 406 Joined: 30-November 09 From: Southern California Member No.: 11,085 Region Association: Southern California |
The early cars had a two outlet blower which Porsche/VW deemed not necessary. The went to the single blower and fed one HE. There is a splitter that attaches to the blower in place of the plastic nozzle that will allow you to run hoses to each HE, which is your bottom image. Then obviously, it's not necessary to route air to both heat exchangers. I think I like that better...the hose running across the engine looks like an after thought and a PITA. Thanks! |
McMark |
Feb 21 2012, 07:21 PM
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#4
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
There were three stock setups for the auxiliary heater fan. The early version (70-72 IIRC) was mounted on the engine itself and the early cars do not have a mount on the chassis.
In 73 they started mounting the fans on the chassis and used a single outlet fan in 73-74 because they figured that the air coming out of the engine fan that gets directed through the heat exchanger was sufficient for passenger comfort. The fan in those years was intended to boost the defrosting of the windshield for the driver. In these cars there is a factory supplied plastic cap that covers the passenger side aux. fan pipe. In 75-76 they added a 'splitter nozzle' to the same 73-74 fan and boosted both heat exchangers. Note that it's the same fan, so the 73-74 cars were blowing all that air out one side, and the 75-76 cars split that air in half. Also, worth clarifying for some silent readers, that the aux fan mentioned/pictured is only for boosting the air through the heat exchangers. All cars have a fair amount of air coming from the engine fan at all times, which will supply heat through a completely stock system. Also, if you don't have a fan connected to one or either of the aux fan pipes, you should plug them. Otherwise you'll lose some of the air pressure from the engine fan. |
Prospectfarms |
Feb 21 2012, 07:30 PM
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#5
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Member Group: Members Posts: 495 Joined: 7-March 11 From: Louisville, KY Member No.: 12,801 Region Association: Upper MidWest |
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brainf18 |
Jan 29 2020, 07:57 PM
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#6
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Newbie Group: Members Posts: 19 Joined: 12-May 19 From: Louisville KY Member No.: 23,116 Region Association: None |
dumb question but I'll ask b/c its cold outside and i want heat. The blower motor mounted on the firewall isn't coming on. but when turn on the "fan" switch I can hear a blower coming from under the dash. I assume both blower motors should activate?
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Jett |
Jan 29 2020, 08:07 PM
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#7
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Senior Member Group: Members Posts: 1,639 Joined: 27-July 14 From: Seattle Member No.: 17,686 Region Association: Pacific Northwest |
dumb question but I'll ask b/c its cold outside and i want heat. The blower motor mounted on the firewall isn't coming on. but when turn on the "fan" switch I can hear a blower coming from under the dash. I assume both blower motors should activate? There are two actuators. To turn on the rear fan, pull up on the switch/lever with the red plastic top, that is located behind the shifter. |
brainf18 |
Jan 29 2020, 08:29 PM
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#8
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Newbie Group: Members Posts: 19 Joined: 12-May 19 From: Louisville KY Member No.: 23,116 Region Association: None |
dumb question but I'll ask b/c its cold outside and i want heat. The blower motor mounted on the firewall isn't coming on. but when turn on the "fan" switch I can hear a blower coming from under the dash. I assume both blower motors should activate? There are two actuators. To turn on the rear fan, pull up on the switch/lever with the red plastic top, that is located behind the shifter. thx...tried that. Not working. Time to trouble shoot |
rhodyguy |
Jan 29 2020, 08:58 PM
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#9
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Chimp Sanctuary NW. Check it out. Group: Members Posts: 22,081 Joined: 2-March 03 From: Orion's Bell. The BELL! Member No.: 378 Region Association: Galt's Gulch |
You have to set the dash controls so the fresh air box is closed. Check the wire on the red handled lever. The lever must be fully raised to activate the fan and it also opens the Heat valves. The aux fan is only of any assistance while idling. Capping both J tubes, decent heat exchangers and a sealed ducting system will provide ample heat.
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Rob-O |
Jan 29 2020, 08:58 PM
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#10
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Senior Member Group: Members Posts: 1,252 Joined: 5-December 03 From: Mansfield, TX Member No.: 1,419 Region Association: Southwest Region |
dumb question but I'll ask b/c its cold outside and i want heat. The blower motor mounted on the firewall isn't coming on. but when turn on the "fan" switch I can hear a blower coming from under the dash. I assume both blower motors should activate? There are two actuators. To turn on the rear fan, pull up on the switch/lever with the red plastic top, that is located behind the shifter. thx...tried that. Not working. Time to trouble shoot It’s a pretty basic switch. Usually it’s just got some corrosion and isn’t making a good ground where the handle is attached to the body of the car. |
SirAndy |
Jan 29 2020, 09:37 PM
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#11
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Resident German Group: Admin Posts: 41,651 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
It’s a pretty basic switch. Usually it’s just got some corrosion and isn’t making a good ground where the handle is attached to the body of the car. (IMG:style_emoticons/default/agree.gif) |
maf914 |
Jan 30 2020, 07:41 AM
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#12
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Not a Guru! Group: Members Posts: 3,049 Joined: 30-April 03 From: Central Florida Member No.: 632 Region Association: None |
You have to set the dash controls so the fresh air box is closed. Check the wire on the red handled lever. The lever must be fully raised to activate the fan and it also opens the Heat valves. The aux fan is only of any assistance while idling. Capping both J tubes, decent heat exchangers and a sealed ducting system will provide ample heat. Rhodyguy is correct. When the heat control lever is raised the initial motion pulls the cables which gradually open the heat control flaps at the heat exchangers. When the flaps are open the last lever motion makes contact which turns on the fan in the engine bay to boost the airflow through the heat exchangers. |
johnhora |
Jan 30 2020, 11:58 AM
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#13
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Senior Member Group: Members Posts: 866 Joined: 7-January 03 From: Derby City KY Member No.: 107 Region Association: None |
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