Heater fan switch wiring??

[Dutch02]

Have a question about the heater fan switch wiring. My 1602 didn't have a heater fan switch. Instead it had some kind of dummy with nothing attached to it on the back. 

 

Now I want to instal a fan switch that I found in another 02 but can't find the wires/plug that connects to it. I did find two wires that were just hanging around under the dash, with something attached to it, but no idea what they are from? 

 

Pics of the switch I want to use and the wires below.

 

Not sure if it's the right switch either? The ones sold by walloth look different on the back with just three connectors.

 

 

[Henning]

1 hour ago, Dutch02 said:

This:

 

is a euro 71-72 heater fan/rear defrost combi switch, located from factory below the driving light switch. Pins #+1 and #+2 are fused power. #S goes to the rear defrost. #1-#3 go to the heater box for the three fan speeds. Check your car's year. All 02s have heater fans, but switched differently from model year to model year. US versions may vary.

 

This:

 

is the push rod of a door switch for the dome light. The surround is missing. Have a look at your A-pillar.

 

henn

 

[Dutch02]

Thnx! I got a 74 1602 so I would need a different switch I guess. The connection with the switch are just separate wires or some kind of plug?

[Mike Self]

There are four different fan switches used on US spec 2002s: 

• early cars had a two speed push-pull instrument binnacle switch located in the lower left corner of the binnacle--off, low, high
• at VIN approx 1664761 the heater gained a third speed, so the switch got a third position--still located in the same location.
• Sometime around the time the modell 71 cars came out (257XXXX VINs) and rear window defrosters became common, the heater switch (same lower left location) must be rotated to select heater blower speeds, and pulled out to engage the rear window defroster.
• With the beginning of 1973 production (VIN 2585138) and continuing on through all squarelights, the heater blower switch became the 4th lever on the heater control--making two levers on the right panel.  

 

What year is your 1602, and is it a US spec car?  If it's a Euro car, and has only 3 heater levers (two left, one right) it may still have a two speed heater.  You can determine that by looking at the connectors where the car's wiring harness meets the heater box, and checking how many wires are present at the blower switch's location in the instrument binnacle.  

 

If you have a four lever heater car (and you know the fuse is good as is the heater blower motor) chances are the brass contacts in the switch--exposed to the elements and dust under the dash--are corroded and not making good contact.  You can clean 'em up by running a small piece of fine sandpaper between each pair of contacts.  Otherwise, you'll have to replace the switch--not difficult, just requires a bit of contortions to get it out of its home under the dash and behind the (removable) trim panel.

 

mike

[Dutch02]

13 hours ago, Mike Self said:

There are four different fan switches used on US spec 2002s: 

• early cars had a two speed push-pull instrument binnacle switch located in the lower left corner of the binnacle--off, low, high
• at VIN approx 1664761 the heater gained a third speed, so the switch got a third position--still located in the same location.
• Sometime around the time the modell 71 cars came out (257XXXX VINs) and rear window defrosters became common, the heater switch (same lower left location) must be rotated to select heater blower speeds, and pulled out to engage the rear window defroster.
• With the beginning of 1973 production (VIN 2585138) and continuing on through all squarelights, the heater blower switch became the 4th lever on the heater control--making two levers on the right panel.  

 

What year is your 1602, and is it a US spec car?  If it's a Euro car, and has only 3 heater levers (two left, one right) it may still have a two speed heater.  You can determine that by looking at the connectors where the car's wiring harness meets the heater box, and checking how many wires are present at the blower switch's location in the instrument binnacle.  

 

If you have a four lever heater car (and you know the fuse is good as is the heater blower motor) chances are the brass contacts in the switch--exposed to the elements and dust under the dash--are corroded and not making good contact.  You can clean 'em up by running a small piece of fine sandpaper between each pair of contacts.  Otherwise, you'll have to replace the switch--not difficult, just requires a bit of contortions to get it out of its home under the dash and behind the (removable) trim panel.

 

mike

It's a 1974 euro spec

 

You mean this? There are three wires going to the heater box

[Mike Self]

Yep.  look closely, though, there should be a brown ground wire plugging into a fourth terminal that's male on the wire and female on the terminal end.  In your picture, none of the wires going into the heater looks brown

 

Your '74 should have the 4 lever heater control, so that fourth lever is the blower switch.

 

Hopefully someone (John76???) will post the wiring diagram for 73-76 heater blowers, switch to heater housing...

 

mike

[Henning]

2 hours ago, Dutch02 said:

 

The brown/green wire here is power from the fuse. Black, purple and yellow are for the speeds. The black one seems to be hidden behind the purple in the pic. These are the four terminals on the heater box.

The three speeds are switched by a slider directly above the heater valve control slider. From there, there's a brown ground wire running to the left fastener bolts of the heater box. So, the fan is negative controlled in a euro 74.

Diagram detail:

 

 

Line #113 in connector #45 is for illumination for the control levers.

 

henn