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A/C Lines Torque Values

Dewey3491 on Wed August 19, 2009 9:47 PM User is offlineView users profile

Year: 2002
Make: Chevy
Model: S-10 ZR2
Engine Size: 4.3
Refrigerant Type: R134a
Ambient Temp: 90
Pressure Low: 0
Pressure High: 0
Country of Origin: United States

Ok guy's maybe you can help me with a stupid question.

I am getting ready to do a complete compressor change and flush. I know what the torque is for the compressor mounting bolts it is 37ft lbs.

But, what I am looking for is the torgue values for the A/C lines that connect to the major components i.e. condenser,evaporator, receiver/dryer and the lines that go to the compresor. Is it just shug tight or does the GM manual call out torque values on these item?

Thanks in advance

Dewey



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Dewey

GM Tech on Thu August 20, 2009 8:02 AM User is offline

Fastener Tightening Specifications
ApplicationSpecification
MetricEnglish
A/C Compressor Low Pressure Switch (4.3 L)5 N•m44 lb in
A/C Compressor Mounting Bolts (2.2 L)50 N•m37 lb ft
A/C Compressor Mounting Bolts (4.3 L)50 N•m37 lb ft
A/C Compressor Rear Bracket Bolt (2.2 L)25 N•m18 lb ft
A/C Compressor Shaft Nut (V7)17.5 N•m13 lb ft
A/C Refrigerant Filter Retaining Nuts15 N•m11 lb ft
A/C Refrigerant Pressure Sensor (2.2 L)4.8 N•m42 lb in
Accumulator Clamp Screw/Bolt10 N•m88 lb in
Accumulator to Evaporator Fitting28 N•m21 lb ft
Air Distributor Duct Mounting Screw/Bolt1.9 N•m17 lb in
Air Inlet Assembly Mounting Stud4.5 N•m40 lb in
Blower Assembly Mounting Nut (RPO C42)4.5 N•m40 lb in
Blower Assembly Mounting Screw/Bolt (RPO C42)4.5 N•m40 lb in
Blower Assembly Mounting Stud (RPO C42)4.5 N•m40 lb in
Blower Motor Access Cover Screw/Bolt (RPO C60 and C68))2.5 N•m22 lb in
Blower Motor Access Cover Screw/Bolt (Utility Only)1.9 N•m17 lb in
Blower Motor Mounting Bolts4.5 N•m40 lb in
Blower Motor Relay Bracket Mounting Screw/Bolt1.9 N•m17 lb in
Blower Motor Resistor Mounting Screw/Bolt1.9 N•m17 lb in
Body Harness Connector (C203) Support Bracket Mounting Nuts9.0 N•m80 lb in
Compressor Discharge Hose to Condenser Fitting28 N•m21 lb ft
Compressor Pressure Relief Valve (2.2 L)9 N•m80 lb in
Compressor Pressure Relief Valve (4.3 L)9 N•m80 lb in
Compressor Suction/Discharge Hose to Compressor Bolt33 N•m24 lb ft
Compressor Suction Hose to Accumulator Fitting48 N•m35 lb ft
Condenser Insulator Retaining Screw/Bolt1.9 N•m17 lb in
Electric Actuator (Temperature) Retaining Screw/Bolt1.9 N•m17 lb in
Evaporator and Blower Module Heat Shield Mounting Screw/Bolt (utility only)2.2 N•m19 lb in
Evaporator and Blower Module Mounting Nut4.5 N•m40 lb in
Evaporator and Blower Module Mounting Screw/Bolt4.5 N•m40 lb in
Evaporator Case Section to Blower Case Section Retaining Screw/Bolt1.9 N•m17 lb in
Evaporator Tube Clip Screw/Bolt1.9 N•m17 lb in
Evaporator Tube to Condenser Fitting28 N•m21 lb ft
Evaporator Tube to Evaporator Fitting28 N•m21 lb ft
Floor Air Outlet Mounting Screw/Bolt (Pickup Only)1.9 N•m17 lb in
Heater Core Access Cover Screws1.9 N•m17 lb in
Heater Inlet and Outlet Hoses Bracket Bolt to Generator (4.3 L)25 N•m18 lb ft
Heater Inlet and Outlet Hoses Bracket Bolt to Generator Mounting Bracket (4.3 L)50 N•m37 lb ft
Heater Inlet Hose Fitting at Intake Manifold (4.3 L )23.5 N•m17 lb ft
Heater Outlet Hose Bracket Bolt (2.2 L)25 N•m18 lb ft
Heater/Vent Module Mounting Nut4.5 N•m40 lb in
Heater/Vent Module Mounting Screw/Bolt4.5 N•m40 lb in
Throttle Control Cable Bracket Nut12 N•m106 lb in


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The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

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