Press heater zone buttons, doesn't change areas. doesn't open and closevent blocks

Cabin air filter? Blower motor working on all speeds? Critters building nest in heater box

Manual Compass Calibration If the compass appears erratic and the calibration symbol does not appear, you must manually put the compass into the calibration mode. To get into this mode, do the following: 1. Turn the ignition on and cycle the DIC to the compass/temperature mode. 2. Press and hold the SET button for longer than three seconds. ZONE # PRESS & HOLD SET TO CHANGE: This display mode will be displayed when you are manually calibrating the system. The current zone number for compass variance will be displayed in place of the # symbol. Use the SET button to select the zone number from the graphic shown to select the current area of the country that you are driving in. PRESS SET TO CALIBRATE COMPASS: After selecting your zone, press the MODE button and this will be displayed on the DIC. Press the SET button and complete three 360 degree turns in an area free from large metal objects. The following two messages will toggle in the display until you calibrate the compass: • DRIVE VEHICLE IN CIRCLE • CALIBRATING COMPASS When calibration is complete, the display will return to its normal mode. 3-61 info obtained from MANUAL OWL
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Compass Variance Zone Procedure DIC Compass Driver Information Center DIC...

http://www.manuals365.com/swf/buick/2004_buick_rendezvous_owners.html?page=200

http://repair.chiltondiy.com/Buick/Rendezvous/Repair-Manual-Online
http://www.repairservicemanuals.com/Buick

Manual Compass Calibration If the compass appears erratic and the calibration symbol does not appear, you must manually put the compass into the calibration mode. To get into this mode, do the following: 1. Turn the ignition on and cycle the DIC to the compass/temperature mode. 2. Press and hold the SET button for longer than three seconds. ZONE # PRESS & HOLD SET TO CHANGE: This display mode will be displayed when you are manually calibrating the system. The current zone number for compass variance will be displayed in place of the # symbol. Use the SET button to select the zone number from the graphic shown to select the current area of the country that you are driving in. PRESS SET TO CALIBRATE COMPASS: After selecting your zone, press the MODE button and this will be displayed on the DIC. Press the SET button and complete three 360 degree turns in an area free from large metal objects. The following two messages will toggle in the display until you calibrate the compass: • DRIVE VEHICLE IN CIRCLE • CALIBRATING COMPASS When calibration is complete, the display will return to its normal mode. 3-61 info obtained from MANUAL OWL
press the helpful button and follow me on fixya for more tips

Compass Variance Zone Procedure DIC Compass Driver Information Center DIC...
http://www.manuals365.com/swf/buick/2004_buick_rendezvous_owners.html?page=200
http://repair.chiltondiy.com/Buick/Rendezvous/Repair-Manual-Online
http://www.repairservicemanuals.com/Buick

Yes. Wish I could tell you which button for sure, but to reprogram the Compass you hold one of the buttons and drive in a circle one or two times to reacquire your position.

Have you checked the block pressure.There was a problem with the impellor coming loose on the water pump which causes low block pressure and reduces circulation.You should also check the vent line to the rad and make sure the jiggle pin in there is ok it sounds like the system may be air locking

Hi
check the fuse box for fused fuse and replace them with the corresponding fuses.
Regards.

There is a heater core valve on vehicles that have a dual zone, ( climate control ) systems. The valve is in the area of the heater core.

Something to try. allow the engine to run for 6 to 8 minutes with the heater wide open, then, turn the engine off and reach back and feel the 2 hoses at the firewall that lead to the heater core. If only 1 is hot you do have some blockage, if both are hot then it is circulating properly and your problem lies somewhere else.

Dual zone systems also have a split door between the heater core and a/c evaporator that often stops functioning properly and it can block the hot air comming from the core.

It sounds like the flow control block. Vacuum or electronically controlled this device changes directions of the bypass line to the heater line if not **** bypassed. Assuming you have owned this vehicle when the heat operated-properly. I will say it is a simple fix of the flow control block on the heater hose. Auto zone will help you with the rest.

I believe I had to remove the Battery to gain access on driver's side. The passenger side had easier to the nut holding the fixture.

the heater core is not under hood it is locatied behind glove box inside