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ACM B1312 Hi side temp sensor


paran0id

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My 1997 Cadillac deville has a Current error code ACM B1312 , "High side temperature open circut". I figure its pretty self explanatory, but my question is where is the "high side temperature sensor",and how can i check it for an open?

Thanks!

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I am far from an A/C expert but if I am wrong I am sure I will be corrected. I am pretty sure the low side is from the compressor to the orifice tube. That would be basicaly the side along the right fender to the orifice tube on the firewall. From the orifice tube, which I believe is on the right side of the firewall to the left fender is the high side. I think the high side sensor is in the line along the firewall (left hafl).

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I would venture that the high side is the high *pressure* side. When the AC is running, this is the warm hose. The cold, heavily insulated hose with condensation on it is the low side.

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Looking at the engine compartment facing the windshield, it will be just right of center in the small diameter a/c line that is parallel to the firewall.

Larry, the low pressure side is from the accumulator to the evaporator but the orifice tube is in the high side. It changes the state of the refrigerant from a high pressure liquid to a low pressure liquid at the evaporator.

Kevin
'93 Fleetwood Brougham
'05 Deville
'04 Deville
2013 Silverado Z71

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Wait a minute. Now I'm confused :huh: What is the canister by the surge tank, accumulator or receiver/drier? I thought it was the receiver/drier and according to the diagram in the link, the receiver/drier is on the low side. Where is the accumulator?

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Wait a minute. Now I'm confused :huh: What is the canister by the surge tank, accumulator or receiver/drier? I thought it was the receiver/drier and according to the diagram in the link, the receiver/drier is on the low side. Where is the accumulator?

The accumulator is the large cannister next to the surge tank on the low side of the system. It has a desiccant inside to dry out any moisture and it also functions to store excess refrigerant.

Recriver/dryers are typically used in A/C systems that use an expansion valve or throttle suctioning valve. The receicver/dryer is located on the high side. Systems use one or the other, not both. GM cars have used the accumulator type systems since the late 1970s.

Kevin
'93 Fleetwood Brougham
'05 Deville
'04 Deville
2013 Silverado Z71

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Thank you so much! With that description I was able to find and fix this in about 10 seconds! (The wire looks like someone snagged it and one lead was pulled out the back of the connector). This was buggin me for a while but I didnt know where to look.

Thanks again KHE!

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