NEED A/C HELP....911SC Temp switch...bad??

[sc]

I just replaced my dash A/C temp switch due to a broken capillary tube. The replacement unit is a little larger (no biggie) but the new switch does not seem to have the clutch on/off "click" to disengage the A/C clutch.
Turning on the blower via the blower switch automatically engages the A/C clutch regardless of the temp switch dial location.
With the old switch, I was able to turn off the A/C clutch via the temp switch and just use the blower to recirculate cabin air.
Is this a bad switch or since the replacement redesign this function no longer available?

[72911]

I just purchased a new temp switch myself but I did not have an old switch to compare the new one to as all of the original AC parts were removed. I am replacing everything. If your new switch doesn't have the "click" at the low temp side then I would say it is not an exact replacement. You may have to live with it that way or add a small switch to duplicate the original switch function. Shouldn't be too hard and then you can use the blower fan without comp activation. I may have to do this mod as I just installed my new switch the other night but have not had a chance to get the compressor installed yet.

[86 911 Targa]

Originally Posted by sc

I just replaced my dash A/C temp switch due to a broken capillary tube. The replacement unit is a little larger (no biggie) but the new switch does not seem to have the clutch on/off "click" to disengage the A/C clutch.
Turning on the blower via the blower switch automatically engages the A/C clutch regardless of the temp switch dial location.
With the old switch, I was able to turn off the A/C clutch via the temp switch and just use the blower to recirculate cabin air.
Is this a bad switch or since the replacement redesign this function no longer available?

I replaced my factory A/C and switch with the same design as yours.

Rotating the temp switch full CW & CCW should
activate/de-activate the compressor.

I would have a look at the two wires behind the switch.

A shorted switch will keep the compressor on at all times,
and cause evaporator freeze-up.

pm me as needed.

Gerry

[Dmitry at Pelican Parts]

Take a look at the link below, it may be helpful to you.

Porsche 911 Variable-Speed A/C Blower Switch Installation | 911 (1965-89) - 930 Turbo (1975-89) | Pelican Parts DIY Maintenance Article

[tirwin]

I think a way to troubleshoot the switch would be to pull out the end of the capillary tube in the evaporator coil and stick it in a glass of ice water. If you turn on the switch the clutch should disengage.