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The hot / cold sliding lever is broken on unit. Common problem, the lever is plastic and breaks easily. If you take a flashlight and look inside the lever slot on the top right side you see a post it connects too. You could take a pick tool and move the post closer to you for heat or away for cold air.
Are all the vents working? Does your Cruise Control work (properly) it may work and shut off. If your vents are working is only hot air or cold air coming thru, or just your defroster vent?
You have a 3 way check valve under fuel rail guard on passengers side, its a pastic barrel shape thing it rots and creates holes in it causing your ac vents and cruise control to malfunction.
next your heater control unit if you have the one with a slider to regulate the hot or cold temperature breaks easily inside unit, its only plastic. Its an arm inside unit to control the temp in car it slides a door open or closed for heat. If you look where he slider enters thru that hole space you will see a post it sits on to open and close .
There are two bolts in the front and two bolts in the rear, remove them and then disconnect any wiring connectors and pull the seat up and out of the car, careful not to damage the dash or body panels.
hooked up the harness, right? Is the rotor back in? the only other thing is it is not lined up properly, and you will have to get the engine to #1 compression at TDC and pull the distributor, line the rotor up to #1 wire on the cap.
I bet its the Heat / AC control unit....the slider that goes from hot to cold is probably broken, I replaced mine 2 times already in my 94 and need another
The slider has a wire that pulls a lever to open from hot to cold, its plastic and breaks inside, its on the top right back corner of it....to get to it you must remove the arm rest top pad only , then the covering for the shift, there are 2 screws in the arm rest to remove shift cover, then you have to remove the facecover for the heat control unit ...
When you remove the shift covering there is a little plastic cover inside with a noch that marks where the shift goes to Park, Drive, Neutral you will see or hear it move just replace it so you know what gear your in when its put back together