Need more info. what year and are you talking about the cold to hot dial/lever or A/C?
If you are talking about hot/cold lever/dial, depending on year it could be a cable or module problem. Older lever models had cables, dial models are a module. The cable can be replaced for just that lever, if it a module it has to be replaced as a complete unit (all the dials together). For years with the module check the fuses/power to and from the module before replacing, also you can get a cheap replacement from a junkyard. For example, I looked into a module for a cirrus(due to a broken knob) and only cost $35.
If you are saying the A/C isn't coming on, check to see if the compressor is engaging when you select A/C. If not it could be multiple things:
1. fuse or bad wire/connector
2. Module
3. No refridgerant- have a leak in the system
4. compressor is bad or press switch
alternator
Dead battery and/or alternator.
There is probably some debris laying next to the plug that is keeping the socket form going on.
check relays in the power distribution center. Fuel pump, Eatx and Autoshutdown relay. Also check the fuses that go to them relays.
Adjust or replace the back up light switch, located somewhere next to the shift lever.
Check the crankshaft sensor. If the sensor on the Grand Voyager is bad then there wont be any spark.
It's usually one of two things: 1. You aren't getting any spark so you will want to start at the distributer cap. 2. You aren't getting any gasoline so you will want to start at the fuel pump.
not enough information is really given here, what engine? is it cranking over (meaning when you hit the key does the engine turn)? do you have fuel? do you have spark at all plugs? is the fuel filter clogged? is fuel getting to the injectors?
Bad ground? How do i check this? See if you are getting power to motor? How? Circuit breaker?
The voyager is curently on a special for 99.99 but it wont lasst long then it will go to 150.00 but it is a good price considering before the 99.99 special it was 250.00
I had my transmission flushed and now my 97 Voyager will go into reverse and doesn't slip anymore. Was doing that until it was warmed up.
It starts cold