Quick question relating to an '90 GL w/AC:

As I understand it there's a high speed fan relay on both AC and Non-AC
vans.  Is there also a low speed relay on AC vans or is the connection
directly through the thermoswitch?  If there is such a relay, where is it
located?  The reason I ask is that I seem to have the high speed but not the
low.  The thermoswitch is new and seems to open appropriately when I test
its resistance.

wade