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Hi Terry, I'm glad to help. I work on these all the time and there are several things that can happen. (1) If the A/C get out of calibration it can cause this to happen but this is not a very common problem. (2) Low on freon can cause it to cool more on one side then the other. (3) Control Head could be defective and not moving the motor for the passenger side. (4) Most Common Problem found is either and bad motor or a broken A/C Door. Here's something you can try. Put the control head in full cold position, full blower, and on panel mode. NEXT: Key Off, UNPLUG the negative battery cable for 20 seconds. Then plug it back in, at this point the A/C system should go through a calibration test, DO NOT touch any controls until it has come back to panel position and nothing is happening. Then see if the pass door will respond. If not, make sure you have the proper level freon. If the freon is OK and you still have the problem then you have a motor or broken door. I would change the motor first its a lot cheaper then pulling the dash out of the vehicle. Hope this helps and have an awesome day Terry.
Jim lets try something first, here's what I need you to do. Take the negative battery cable off for 20 seconds and before hooking it back up make sure your blower is on HIGH and the control head is in the panel mode (Face Mode) and the temperature is in full cold. Hook the battery back up and start the engine. NOTE: DO NOT touch the control head until it has gone through all the calibration modes and came back to rest at the panel mode and the air flow stays in the panel mode. When this happens the calibration is complete. Then see if it switches to all the other modes. Hope this helps and have an awesome day Jim.
Check to make sure that you have enought freon to engage the compressor, then you will need a flow chart to take you through the rest of the steps necessary to diagnos this problem. The Electrical system manual for Buick is the only one that will have the proper information for you to walk through the steps to dead head it. There is a HVAC programer that is behind the floor heater duck work. It has a numbering system that goes from (2) rows of pins that go 1-16 for terminals.On terminal 5-7 with ignition in run position, you need bat. votage. Terminal 10 & 11 you need 4-5 volts. Neither 10 or 11 should be unplugged just yet since 10 feeds 11 pin. If there isn't any voltage at these pins, check for corrosion on the pins theirself, or for the pin that it may have slipped back out of the connector. Good luck.
hello,hoping your 98 mb s320 is 140 model,try to check fuse in base module located at left side standing in front,remove 4 pcs.allen screw ,visual check your fuse,renew if needed,be sure you have freon gas in your system,if not corrected,send your car for proper diagnosing,ty
Tools required: Phillips screwdriver, small flatblade screwdriver, rachet with 6 inch extension & 10mm socket.
1. Remove negative battery terminal (for stray voltage & airbags.)
2. Remove gear shift trim
3. Remove cable attached to lighter socket.
4. Remove center climate control knob and screw beneath it.
5. Gently pry both bottom corners of climate control face (up then towards the rear) until clear of lock.
6. Pull entire climate control console rearward until clips release. Leave all wiring attached.
7. Remove 4 bolts under radio (10mm.)
8. Gently pry between dash and AC ducting panel (both sides) and pull out.
9. 4 clip hold radio to ducting panel, gently pry while pulling radio out the back.
The rest should be easy...
9. 4 clips hols radio to
Apart from the fuse box in the engine bay there is a fuse repository behind the coin alcove underneath the boot release. Fuse 3 for the lighter (I think) was blown. I replaced it and now the climate control console responds and the display lights up.