Going back to Arthur's explanation of the HIGH and LOW fan systems, imagine this scenario:

- You have the manual switch in place but it is in the OFF position.
- Your A/C is OFF.
- The car heats up in stop and go traffic.

Will the HIGH fans still kick in when the car gets hot enough (105 degrees, I presume)? It would make sense since the HIGH and LOW fans are on different circuits, however, I am not sure if installing the manual switch puts it on the LOW fan circuit only.

Also, since the Cool Harness was also mentioned:

Does the original Cool Harness have the same problem as the V2 -- keeping the fans on HIGH once they are on? Is this a consistent problem with Cool Harness users or an isolated incident?

I am interested in applying both changes to my '89 190E 2.6 which has a dead A/C (leaky evap).