Having problems with your Dodge Ram 1500 ?
1996 dodge ram 1500, blows cold air out of heat
Vacuum-operated mixer valve may be broken or stuck in one position. This would be something similar to a "flapper-style" valve located in or near the duct system under the dash and will be located inside something else and not visible to the eye. You can do a visual inspection of the under-dash system to check for loose/broken vacuum hoses or perhaps even small cables that are broken, but unless you are comfortable working on vehicles, going further than this may not something you will want to attempt. Manually work any connections to ensure a tight seal and freedom of movement, if at all possible.
Repair Help & Product Troubleshooting for Dodge Ram 1500
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