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The power stage does cause problems here is some info for you . Jim
Passengar side, remove noise barrier under unit. May have to access through glove box. Unlplug it ,, easy to change.. Dealer item..
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The power stage module or resistor pack, same thing, is easy to change I think 1 screw
Here is the part number Resistor 30864189 $49.41 price could be a little more. suggested list. Volvo dealer will have the part. If you have If it is the switch I do not have the part number at this moment but can get it. If you have automatic temp control then you have to replace complete control head. Hopefully just the resistor pack.
Let me know if you need more clarification. Jim
Yes to first statement.
Automatic means electronically controlled. Set it to 78 deg and it stays there , you do not have to adjust temp. Let me know if the resistor is not the problem. Jim B
No not know. I check with you tomorrow. You can give a bonus if you wish.
Let Jim B
That is the power stage. It is bad if the blower runs when the blower switch is the 0 position. Install new unit. It is shorted internally.
That is the fix according to the bulletin . I have been doing this for years so anything is possible you may have more than one problem. But in your case that is where you must start. If you are not really sure then I suggest you take it to your repair shop.