B1 Fault Codes 4-1-4, 1-2-2 on 1995 850

Ossipeegirl · Post by **Ossipeegirl** » 17 Jun 2007, 11:34

Hi Everyone,

It's that time of year again and my AC is not working. Tried filling it up with coolant but it still didn't kick on. Tried jumping the compressor but that didn't work either. We read the codes from the B1 port and we get
4-1-4 (driver's side temp fan seized) and 1-2-2 (outside temp sensor). Would someone please give me instructions on where to go from here? I know lots of women know alot about their vehicles but I'm still learning so please give me as much detail as you can. I definitely appreciate it!!!! Thanks for your time!!!!

Post by **Ozark Lee** » 17 Jun 2007, 14:10

You have correctly identified the codes however they don't necessarily correlate to the A/C problem.

The 1-2-2 Code, as you indicated, is the outside air temp sensor. Inasmuch as it is exposed to the elements, both environmental and physical, the chances are it either has a corroded connector or it has been physically damaged. Does the temp gauge on your instrument cluster work? If so the sensor is likely OK and the problem is in the wiring between the instrument cluster and the climate control unit.

The 4-1-4 code, as you again correctly identified, is the drivers side temp sensor fan. The temp sensor and its fan is located just above the grab rail on the drivers side of the car. Remove the grab rail (there are screws under the pry out plastic covers on either end of the rail) and then remove, clean, and lubricate the fan. It will likely come back to life.

The root problem of the A/C not working needs to be tested further. You need to get a pressure gauge on the system and measure the static pressure of the system - the pressure while the compressor is not running. It should be in the range of 100 lbs. or so depending on the ambient temperature.

If you have pressure in that range and the compressor still will not turn on try jumping the pressure switch to see if the compressor will indeed turn on. If that works, check the pressure again, it should be in the neighborhood of 35 lbs. while the compressor is running. If that checks out, replace the pressure switch.

If the compressor still will not run you need to check the A/C relay, which is located behind the glove box, to make sure it is engaging. You should be able to hear or feel it click when you turn on the A/C switch.

If the relay clicks, and the pressure switch is jumpered, and the compressor still won't kick on you need to use a voltmeter at the compressor. Test it at the junction of the gray wire and the black wire on the compressor. If the compressor still has voltage when system is turned on then you have a bad A/C clutch and it will need to be replaced.

mdebel · Post by **mdebel** » 25 Jun 2007, 14:17

I have a similar problem and I suspect the ac relay. How do you get to it and what is the part number to replace. Where can I find a new A/C relay. I do not hear any clicking when I turn on the A/C. Fan works properly, blowing hot air, compressor not kicking in.

Post by **Ozark Lee** » 25 Jun 2007, 14:50

It is located behind the glove box. There are two relays together on a rail next to the blower resistor. One relay is the max fan relay and the other is the A/C relay. The easiest way to get to them is to remove the glove box and look more or less halfway between the blower and the center console. I'm not sure of the part number but FCP Groton or any dealer can get one for you.

...Lee