Tech Tip: Sealing Pipe Connections on Porsche Expansion Valve – UnderhoodService

Tech Tip: Sealing Pipe Connections on Porsche Expansion Valve

Under certain circumstances, refrigerant loss from the area of the expansion valve pipe connections can be misdiagnosed as a defective expansion valve. As of production date October 1993, a longer bolt has been used in the installation of the A/C lines to the expansion valve. The new bolt is installed as a precaution to prevent the expansion valve from distorting, which could cause a leak at the pipe connections on the expansion valve.

Models Affected:

1989-later 911 Carrera 2/4, 1991-later 911 Turbo and 1995 911 Carrera

Under certain circumstances, refrigerant loss from the area of the expansion valve pipe connections can be misdiagnosed as a defective expansion valve.

As of production date October 1993, a longer bolt has been used in the installation of the A/C lines to the expansion valve. The new bolt is installed as a precaution to prevent the expansion valve from distorting, which could cause a leak at the pipe connections on the expansion valve.Figure 1

Repair Information:

Use the new bolt, M6 x 30 mm (P/N 900 074 015 02) (see Fig. 1) when repairs to the expansion valve are necessary.

The torque specification for the bolt is 10 Nm. Do not exceed this torque.

Courtesy of Identifix.

You May Also Like

Auxiliary Water Pump Diagnostics

A car or truck comes into your shop with a complaint of poor heater performance. The driver complains that on cold mornings the heater will blow cold during the drive to work in rush hour traffic. The car is not overheating and the air is coming from the correct ducts. Your first reaction might be to install a new thermostat and inspect the heater core for a blockage. On the test drive, the system may perform great for you. Is the customer just cold blooded?

A car or truck comes into your shop with a complaint of poor heater performance. The driver complains that on cold mornings the heater will blow cold during the drive to work in rush hour traffic. The car is not overheating and the air is coming from the correct ducts.

VIDEO: Diagnosing The A/C Compressor Clutch

Andrew Markel discusses the clutch on the A/C compressor, and the signs to look for in your diagnostic to confirm its operation. Sponsored by Valeo.

Toyota FJ Cruiser Water Pump Replacement

Toyota’s original Land Cruiser was the company’s version of a Jeep that could go anywhere. In its time it was highly rated and collected, which led the Japanese juggernaut to bring back an updated SUV in 2007 called the FJ Cruiser. The retro-styled vehicle was again a go anywhere machine powered by a 4.0L V6 (1GR-FE) used in the Tacoma. The engines are durable and considered relatively robust for the time.

Long-Life Coolants Explained

Different types of coolants cover a range of applications from diesel to domestic, Asian and European vehicles. Each one is formulated to a specific manufacturer’s specifications to keep their engines at an optimal temperature. But, changes to the old one-size-fits-all formula has led to confusion for consumers and even some technicians.

VIDEO: Engine Efficiency Brings More Hoses

Andrew Markel discusses hoses and the necessity for several of them to route fluids to all parts of the vehicle due to the growing efficiency of engines. Sponsored by Dayco.

oil-coolant-hoses-video-featured

Other Posts

Why Does Engine Coolant Need Replacement?

Two specifications can be used to justify replacement — the condition of the additive package & the freezing point.

Climate Control Modules

HVAC control modules may fail when the contacts and switches become inoperable. Sponsored by The Group Training Academy.

Improving Turbocharger Longevity

It is estimated that by 2022, 50% or more of vehicles sold in the U.S. will have one or more turbochargers under the hood.

Dorman Launches 300+ New Products In November

Among the new products is an OE FIX climate control module designed to fit 1.7M Chevrolet Express & GMC Savana vehicles.