One of three things come to mind.
1 The temperature door cable is broke, binding, or disconnected.
2 The heater core is clogged. Ever use any type of radiator stop leak products.
3 It does have a heater control valve, it is malfunctioning or not hooked up properly. In the old days they were in the heater hose. Now I do believe they are part of the heater/AC assembly unit.
The link in blue at the left of this page "Repair manuals" should be able to provide you with a hard copy tech manual.
Here is a link to a generic repair manual for front wheel drive Dodges.
Sunday, February 12th, 2006 AT 12:31 PM