BrickBoard Archives
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ACC Inside temperature sensor[700/87] posted by Jack.Bramwell on
Tuesday, 5 June 2001, at 8:36 p.m.
I need to replace my inside temperature sensor for the ACC (the one in the dash board) but dont want to spend $100+ for an original. Dose anybody know the specification for the little electronic component? All the manaual says is that it should have continuity over 18C. Also, can anyone explain how the whole thing works or where I could find such a discription.
Mine only runs hot and I think it is an electronic problem because I have schecked out the vacuum and mechanical components.
Re: ACC Inside temperature sensor[700/87] posted by John Alvarez on
Tuesday, 5 June 2001, at 9:35 p.m.
The unit is called the manual climate control unit(MCC). It's a circuit board, relay and switch device all in one. Very common problem with 700 series. Read 700FAQ's about problem with this unit and common broken solder problem on the circuit board, and it's fix by resoldering broken solder.
I had the same problem with my '92 740 but resoldering did not help my problem. New unit at the dealer $600plus. Salvage yard $150.
Good luck
John A, '88 240, '92 740, Tampa Bay , FL.
Re: ACC Inside temperature sensor[700/87] posted by Rafael Riverol on
Tuesday, 5 June 2001, at 10:01 p.m.
Instructions from Volvo when ACC goes from cold to warm on its own: disconnect this inside temperature sensor and connect wires directly. I have done it and it works fine. This sensor is there only to keep AC from blowing below 64 degrees Farenheit. If you will normally run the heater when outside temperature plunges, or use ACC to set desired temperature, you do not have much to worry about. If you want more details, you can check the Volvo manual, TSB or ALLDATA CD-ROM for $20. Anyhow, you can remove the glove compartment, disconnect the sensor, directly conect te disconnected sensor with a piece of wire, and see how it works. If you do not like it thus, you can always go and spend money on a sensor later because everything will be in place and nothing wil be damaged.
--Rafael
Re: ACC Inside temperature sensor[700/87] posted by JohnB on
Wednesday, 6 June 2001, at 7:09 a.m.
I wired in an override spdt switch in one wire on the sensor...flip it and it turns the a/c on as cold as it will go...tells the controller it's dead hot inside the car.