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Super Mechanic
Super Mechanic, Master technician
Category: Chevy
Satisfied Customers: 17218
Experience:  29 yrs. exp., ASE master, cert. in G.M. electrical, a/c, susspension, brakes, electronic steering
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Orpheus tube located under the hood of the 2006 chevy equinox

Customer Question

where is the orpheus tube located under the hood of the 2006 chevy equinox
Submitted: 8 years ago.
Category: Chevy
Customer: replied 8 years ago.

2006 Chevrolet

Already Tried:
just trying to locate it.
Expert:  Super Mechanic replied 8 years ago.

Hello and welcome to Just, Super mechanic here. About your vehicle.


On the 2006, the A/C system uses an expansion valve in place of the orifice tube. It is on the HVAC module, however, there has been a service bulletin issued for the problem of non-cooling for it, which involves a reprogramming of the BCM.


Here is the location of it along with the bulletin, thanks





A/C - Poor Performance/Not Cold Enough

Bulletin No.: 07-01-38-005

Date: July 18, 2007


Poor A/C Performance, A/C Does Not Get Cold Enough After Long Drive Cycle (Recalibrate BCM with Tech 2)


2006 Chevrolet Equinox
2006 Pontiac Torrent



Some customers may comment on poor A/C performance or that the A/C does not get cold enough after a long drive.

Some of the possible symptoms of this condition are:

Blowing warm air

Reduced air flow

Mist/Vapor coming out of vents


The cause of this condition may be due to the evaporator core freezing up.

Fix It Right the First Time Tips

DO NOT replace the evaporator temperature sensor for this condition unless diagnosis proves it to be the root cause.

The sensor can be checked for proper function using the Tech 2(R). Check the sensor for volts varying around 2.3V to 2.6V. This data is within the BCMand is displayed in the accessory list. If the volts are near zero, check for a good connection at the sensor. Also, inspect the harness for possible damage. The sensor is located on the driver's side of the HVAC module and can be accessed from underneath the instrument panel by removing the closeout panel and OnStar(R) module, if equipped.

DO NOT replace the thermal expansion valve (TXV) for this condition unless published SI diagnosis proves it to be the root cause.

If AC components have been replaced or the refrigerant has been evacuated and recharged and no PAG oil has been added back into the system, it may have a reduced oil level. Please ensure that the vehicle has the proper amount of PAG oil in the system, as low oil level will contribute to the evaporator freezing up. To return to a nominal level of PAG oil, it may be necessary to flush the system. Refer to SI for flushing instructions.


The Tech 2(R) must have software version 27.009 or later.

Recalibrate the BCM with new software using the Tech 2(R) and following the procedure below. This updated software will control the cycling of the compressor clutch to prevent freezing of the evaporator core.

Install the Tech 2(R) to the vehicle and power on.

Turn ON the ignition, with engine OFF.

Select "Diagnostics."

Build the vehicle.

Select "Body Control Module".

Select "Module Setup".

Then press "BCM Setup" soft key to execute update. When completed command state will change from "None" to "BCM Setup".