How do i remove the dash panel around the heater switch

SOURCE: 2000 Dodge Caravan Sport. Heater and AC quit working.

these heater control units were in a bad spot..cup holder right below..coffee spills have been known to get in control unit..can be expensive to replace..try a wrecking yard

SOURCE: 04 stratus blower not working

You might have an interconnection problem. I hate these problems, they can be really tough. I had something similar that turned out to be a bad ground connection, but you said that "Relay in box under hood is good and has 12.5 volts going to 1 post"... well OK, good, but then you said "switched the Relays around and everything else worked fine"... well OK, but if it didn't work fine before, you may have a bad relay or maybe a bad connection, so swap them back and see what happens to help isolate the problem. You also said "Ran hot to fan and it works", well in that case, it's not a ground connection at the fan, but still could be further back. It could be bad relay. Good luck to you on that one... as I said... I really hate these kinds of problems. Try to get hold of a wiring diagram if you haven't already. This problem is going to take some patience, but you’ll find it.

SOURCE: 2000 dodge ram pick up - ac blows hot air and freon is good

expansion valve looks like is not openning or the capilary tube is bad

SOURCE: 2002 Durango heater controls. The directional

if it works off vaccum you have a vaccum leak

SOURCE: removal of heater fan switch on dash.

Chances are it is in fact not the switch. These systems are wired so that at high speed setting battery power is connected directly to the fan. However lower settings switches through a set of resistors. These are mounted on a circuit board which in your case is mounted on the firewall on the passenger side of the vehicle under the wiper. Check this before you turn the control panel into a heap of spares on the garage floor.