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Old 01-14-2014, 11:40 AM
usaf 1
Join Date: Nov 2011
Location: Springfield, Missouri
Posts: 29
84 300D AC Accumilator

I have a 84 300D, I would like to know what 2 wires are connected to the AC air accumulator (etc from what relay number). Thanks for any help.
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Old 01-14-2014, 12:04 PM
Registered User
Join Date: Jun 2013
Location: PNW
Posts: 242
If this is a case of there are no wires there and you want them connected... Then the easiest thing would be to find another car of the same model or a picture of that under the hood on the internet and see where the wires come from.

A wrecking yard might still have the engine in a similar car, but usually the engines are pulled. Maybe they left the wires connected to the accumulator?

If your wires are connected and you are troubleshooting a problem, then best to get a factory electrical diagram of the climate control system for your car.

Note: I don't know about your specific car... Usually there is a high pressure or low pressure or high/low pressure sensor to which two wires are connected to. If the refrigerant gets to be too high of a pressure, it will shut down the compressor to avoid an explosion (safety). And if the pressure is too low, it will also shut off the compressor so it will not be wrecked. There is lubrication circulating in the lines, if that has leaked out, the compressor could be wrecked if operated.

Sometimes those switches will need to be replaced (compressor not coming on). But quite frequently someone puts too much refrigerant in the system and it keeps the compressor from operating - or there is a refrigerant leak, that keeps the compressor from operating.
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Old 01-14-2014, 12:30 PM
compu_85's Avatar
Waiting for his Model 3..
Join Date: May 2008
Location: Springfield VA
Posts: 5,174
The device with the two "loose" wires is the temp switch which turns on the electric aux fan. The device with two spade connectors is the pressure cut off switch.

1991 350SDL. 230,000 miles (new motor @ 150,000).

2013 Fiat 500E. 20,000 miles, 80 miles at a time.
2012 Passat TDI. 95,000 miles. More space, power, and fuel economy than the Benz
2004 Touareg V10 TDI. 150,000 miles. One of 450.
1999 Jetta TDI. 310,000 miles.
1992 Jetta ECOdiesel. 156,000 miles. 1 of 48. Sold.
1991 Jetta ECOdiesel. 430,000 miles. 1 of 700. Sold to VeeDubTDI, totaled in front of our house
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