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Registered
Join Date: Jan 2001
Location: Iowa
Posts: 1,020
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Heater control question (switch location)
In Carreras without automatic heat control, the engine blower is turned on by lifting either lever between the seats. Lifting the lever trips a switch which activates the engine compartment blower via the relay on left side of engine compartment. My question: where is this switch that is activated by lifting the lever? The PET CD does not show the switch to be at the levers, which is where I would expect it to be. Wiring diagram in Bentley (970-52) shows that the lever does activate a a switch.
NB. I am _not_ referring to the auxiliary blowers in the cabin, which are activated by turning the 4 position dial switch between the seats. |
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11-08-2001, 06:22 PM
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Join Date: May 2001
Location: Charlotte, NC USA
Posts: 25
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the switch is underneth the lever on my car.
I cant figure out the four postion switch what it turns on since it does nothing in mine, not sure if switch is bad or fan motor. Not to much info in bently about it.
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Zuvuya 85 carrera targa |
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11-09-2001, 05:13 PM
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Senior Member
Join Date: Jun 2000
Location: N. Phoenix AZ USA
Posts: 28,943
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Zuvuya,
You have a fuse blown, relay not working or switch out. When you rotate the switch on top of the handbrake lever console the small fans in the footwell should come on, while lifting either of the two "heater" levers sends power to the heater fan in the motor compartment. Time to get out the wiring diagram and go from there. I would check fuses first then work back to the rotary switch.
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2013 Jag XF, 2002 Dodge Ram 2500 Cummins (the workhorse), 1992 Jaguar XJ S-3 V-12 VDP (one of only 100 examples made), 1969 Jaguar XJ (been in the family since new), 1985 911 Targa backdated to 1973 RS specs with a 3.6 shoehorned in the back, 1959 Austin Healey Sprite (former SCCA H-Prod), 1995 BMW R1100RSL, 1971 & '72 BMW R75/5 "Toaster," Ural Tourist w/sidecar, 1949 Aeronca Sedan / QB |
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11-09-2001, 05:16 PM
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Join Date: May 2001
Location: Charlotte, NC USA
Posts: 25
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where is the relay, this has been an ongoing problem since last winter and it is once again starting to get cold here. I have no blown fuses in the engine or trunk compartment, all other electrical components of car work properly. I would suspect relay before switch. as its connections are clean, lights up and clicks like the microswitch should do but no fan comes on. when I pull up the levers I get defrost fan.
any help would be great Thanks 
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Zuvuya 85 carrera targa |
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11-09-2001, 05:27 PM
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Registered
Join Date: May 2001
Location: Charlotte, NC USA
Posts: 25
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where is the relay, this has been an ongoing problem since last winter and it is once again starting to get cold here. I have no blown fuses in the engine or trunk compartment, all other electrical components of car work properly. I would suspect relay before switch. as its connections are clean, lights up and clicks like the microswitch should do but no fan comes on. when I pull up the levers I get defrost fan.
any help would be great Thanks
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Zuvuya 85 carrera targa |
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11-09-2001, 05:29 PM
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Join Date: Oct 2000
Location: Sherwood, Oregon
Posts: 2,119
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The switch is attached to the hand brake lever. It can be seen from the passenger side.
The part can be found on the PET -CD #701-05 part #5.
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Cary 77 Carrera RS w/3.2 #59 73 914S 2.0 AG 73 914 1.7 Driver ( daily driver, under complete rustoration ) 74 914 2.0, 71 914 Tub, 74 914 2.0 Tub + 73 914 donor |
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11-09-2001, 06:58 PM
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Join Date: Sep 2001
Location: New England
Posts: 380
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Check out www.type-911.co.uk/images/exhausts/
Scroll down to heatingtech1 thru 6. Best explanation I have found of the heating system; explanation, photos, wiring diagrams. Save the site - it has lots of good info....... Argo 88 Targa |
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11-09-2001, 07:29 PM
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Senior Member
Join Date: Jun 2000
Location: N. Phoenix AZ USA
Posts: 28,943
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Argo,
Nice site but the illustrations I have seen appear to be right out of "up-fixing der Porsche"... These books are almost as good as PelicanParts BBS when trying to figure out any Pcar problem.
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2013 Jag XF, 2002 Dodge Ram 2500 Cummins (the workhorse), 1992 Jaguar XJ S-3 V-12 VDP (one of only 100 examples made), 1969 Jaguar XJ (been in the family since new), 1985 911 Targa backdated to 1973 RS specs with a 3.6 shoehorned in the back, 1959 Austin Healey Sprite (former SCCA H-Prod), 1995 BMW R1100RSL, 1971 & '72 BMW R75/5 "Toaster," Ural Tourist w/sidecar, 1949 Aeronca Sedan / QB |
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11-09-2001, 07:51 PM
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Registered
Join Date: Mar 2001
Posts: 9
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please advise part number
if someone finds out the part number of this switch could they please let me know, I have a Euro '78SC which was missing the switch, I have temporarily installed a manual switch but would like to properly fix it
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11-12-2001, 04:55 AM
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Senior Member
Join Date: Nov 2000
Location: Great NorthWest
Posts: 3,941
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Like Nifty I too need this switch for my '78 US spec SC. For now I also am using the manual switch.
Jw |
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11-12-2001, 05:25 AM
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Join Date: Oct 2000
Location: Sherwood, Oregon
Posts: 2,119
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Hard to find the part number when you don't know what its called.
Heater Contact Part # 911 631 525 00 Maybe talk to Tom here at Pelican, and see if he can get it for you. Then read the tech article about "extra cooling" when you install the new one. Nice when stuck in traffic. Also great for cool down after DE laps and autocross run. After you've let engine rest. Turn off engine. Turn ignition back on. Then lift the engine lid and open the heater lever just enough to get the blower going. Helps the hot engine from "heat sinking". The air going across it helps dissipate the heat. I would suggest taking out the passenger seat when you change the switch. Gives you a lot more room to work. Good Luck.
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Cary 77 Carrera RS w/3.2 #59 73 914S 2.0 AG 73 914 1.7 Driver ( daily driver, under complete rustoration ) 74 914 2.0, 71 914 Tub, 74 914 2.0 Tub + 73 914 donor |
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11-12-2001, 06:01 AM
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