My heat only works on the driver side and not on pasenger side

Mabe is discunect

look under dash to make sure vent door is working proper

I had the same problem due to a bad battery. When I replaced the battery the same issue with heat on passager side and cool on the drivers side. After turning the engine off and back on five times the computor reset it's self and both sides blew cool.

The pasenger side window button may be bad or wire hornest that runs from pasenger side kick panel in door jam, to the inside of the door. open passenger side door there will be a rubber boot between the door hinges.pull the rubber boot back and check for broken wires.

Check and replace the right side temp-controller.

Remove both of the ac connections under the hood in the firewall.. use a garden hose on the disconnected pipes and have someone slowly turn the water on...do one side first, then do the reverse side..this will flush the system of build up or corrosion...you should see dirty water, then clean water coming out...reconnect hoses at firewall..cheers

i have came across this on one of these before and it was the element that heats the seat had broken ,and ive had one where it was an electrical problem (switch )

Have the blend door and the resistor checked.

check the wires that are used for connection

broken cable? if possible trace the cables back to the box move then bolth and see if one doesnt, if so you could alwase manually move it for a temp fix