Question about Volvo 850

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I Have a 1996 850 volvo and the the control knob that selects defrost, floor etc... is broken off. How do I replace it? And do you know where I can get the control unit?

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  • Volvo Master
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About the parts, check it in this link: automotix.net/usedautoparts/1996-volvo-850-inventory.

Could find interesting this repair guide: service/850/AC-HeaterSystem-Manual (pdf format)

Hope this helps.

Posted on May 27, 2011

  • ZJ Limited
    ZJ Limited May 31, 2011

    Your welcome; thank you for using Fixya.

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Why wont my 2001 ford windstar blow out of vents ? only on defrost?


Air Flow Control
Air flow control is accomplished in the following manner:
  • Primary control is through the function selector knob , mounted on the heater function selector switch, which is part of the heater control .
  • The function selector knob has the following positions: OFF, PANEL, PANEL/FLOOR, FLOOR, FLOOR/DEFROST and DEFROST.
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  • The vacuum selector valve directs source vacuum to various vacuum control motors (18A318) . Refer to the System Airflow Schematic and Vacuum Control Charts.
  • An internal single-pole electrical switch is also controlled by the selector. The switch controls the electrical supply to the heater blower motor switch (18578) .
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1 Answer

Hvac system


1-check the vent door actuator while you turning the knob from the (vent/defrost/floor) if its not changing the directions and you hear clanking or plastic gear rubbing ..then that's the actuator broken 2-turn the knob again same above and if you don't hear the sound of the actuator ..then you have the climate control unit is defected if its Digital control unit .

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The LH models (LHS, Concorde, New Yorker, Intrepid, Vision) do have self-diagnostic capability with the standard type heater controls. I don't know about the Sebring heater controls (my '95 manual doesn't mention it) but if you have the various controlknobs/buttons that I will describe you could give it a try.
There is a rear window defogger that is initiated by a push button with an LED light. That light is the readout, by its blinking. To begin the diagnostic mode, run the vehicle at idle with the controls set as follows: the blower speed knob should be on any position other than OFF, the temperature knob should be set in full COOL, and the mode knob should be set on Defrost mode.
To enter the diagnostic mode, press the defogger switch in for five seconds, until it begins to blink, then release it. It will continue to blink for about 30 seconds while it calibrates. If it goes out, the calibration is OK and you can skip 3 paragraphs to "Position...mix mode" below.
If the light stayed on, switch the mode knob to the MIX (defroster-floor) position. If the light stays on there is a problem with the control head unit.
Switch the mode knob to the FLOOR position, if the light stays on, it indicates a problem in the blend door or the blend door actuator wiring.
Move the knob to the Bi-level (panel-floor) position where a continuous light indicates a problem with mode actuator or circuit.
Position the knob in the MIX mode. The LED light should now flash twice then pause, and continue a two-flash sequence, indicating that the MIX mode is OK.
In the FLOOR mode the light should flash three times, meaning that the FLOOR mode is OK.
In the Bi-Level Mode, a four-flash sequence indicates that mode is OK.
In the PANEL mode the light should flash 5 times to indicate no problems there, and in the recirc-panel mode 6 times and seven times in the recirc Bi-level mode.
The temperature control can be checked by switching the mode knob to Defrost and rotating the temperture knob. If the temperature contol is OK, the light will flash faster the more you turn the temperature knob up, until the light goes out at the hottest setting.
Switch the knob between Panel and Recirc-Panel and watch the recirc door (unit under the dash). Proper operation means that circuit and components are OK.
To get out of the self-diagnostic mode, turn off the blower or push the air conditioning button once.
If this doesn't seem to apply to your control head or you get no response from an LED light for the rear defroster, then the Sebring may not have this capability. Please let me know your results if any

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1 Answer

Floor heat does not work but defrost etc works is that still a heater core replacement?


If you have warm air coming through the defroster vents then your core is not gone. there is something blocking or bent on the heater box mechanism which directs the air flow up or down, or on the climate control knob which controls it, or in the cable which connect the two.

Nov 26, 2010 | 2000 Chevrolet Blazer

1 Answer

The heating and cooling system works fine. Problem we are having is that no matter where the setting to control where you want the air distributed to (ie:defrost, floor, etc.) it only comes out of the main...


We just had the same problem. I pulled off the knob that switches the selection location and found that the plastic had two hairline cracks in it keeping it from turning the metal spindle. I sprayed some non-flammable silicone on the spindal (which was stiff to turn) wedged some paper into the knob above the cracks and we're back in business.

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1 Answer

Heat blows out at floor only and ac does not come on even though light Indicates it's on. Has rear defrost and light works..Also has recirculating air button . I'm guessing the whole heating control in...


I would first remove the fuse for the heater control head for one minute and then put in and retry.
The control head could have locked up on you with a volt spike. The rear defrost switch does not go through the same circuit in the heat as the hvac controls. Could be a broken know also.
Could also be mechanical linkage on side of heater box above accelerator pedal may have broken or popped apart. or if electrical motor control may be actuator.

#76-11-01: HVAC CONTROL KNOB SPINS FREELY (REPLACE) - (Oct 9, 1997) 999999995.gif SUBJECT: HVAC CONTROL KNOB SPINS FREELY (REPLACE ALL THREE KNOBS)
MODELS: 1996-97 CHEVROLET AND GMC M/L AND G VANS 1995-97 CHEVROLET AND GMC C/K TRUCKS
CONDITION:
SOME CUSTOMERS MAY REPORT THAT ONE OR MORE HVAC CONTROL KNOBS SPIN FREELY, RESULTING IN LOSS OF FAN, TEMPERATURE AND/OR MODE OPERATION.
CAUSE:
THE KNOB'S PLASTIC INNER SHAFT MAY CRACK WHEN FORCED AGAINST ITS STOP.
CORRECTION:
IF ANY ONE OF THE THREE HVAC CONTROL KNOBS EXHIBITS THIS CONDITION, REPLACE ALL THREE KNOBS WITH NEW P/N 16268157.
PARTS INFORMATION:
P/N DESCRIPTION QTY 16268157 KNOB, HVAC CONTROL 3

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1 Answer

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these are common for knobs breaking, pull knob off and look at the back see if its broken, pull a good one off and compare,il bet you its broken, so it doesnt spin the shaft it feels like it is but it doesnt, hope this helps,

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1 Answer

I can't change the direction of the heat and air conditioner . The switch to change it from defroster, to floor is broken. how do i fix it?


is it just the knob that broke or the whole thing
you can buy just the knob
if it is the whole thing then you will need to replace the HEATER CONTROL HEAD
hope this was helpful

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