Where Is The Expansion Valve Located On A Honda Accord?

The expansion valve is a small device that regulates the flow of refrigerant in the air conditioning system. It controls the amount of refrigerant entering the evaporator core, helping to optimize cooling efficiency. Knowing the exact location of the expansion valve in your Honda Accord model is crucial for proper maintenance and repairs. This article covers the common locations across different generations and provides tips on accessing the valve for servicing needs.

Where Is The Expansion Valve In Honda Accord Models?

The specific location of the expansion valve differs across Honda Accord generations and engine types. Here is an overview of the common placement:

First Generation (1976-1981)

  1. Mounted on the evaporator core housing under the dashboard on the passenger side.
  2. Requires removing glovebox and evaporator box to access.

Second Generation (1982–1985)

  1. Located on the firewall side of the engine compartment.
  2. Need to disconnect tubing and discharge the AC system to access.

Third Generation (1986–1989)

  1. Positioned on the passenger side firewall in the engine bay.
  2. Must remove battery and air cleaner assembly to reach.

Fourth Generation (1990–1993)

  1. Mounted near the front bumper on the passenger side.
  2. Access by removing headlight assembly and front bumper.

Fifth Generation (1994–1997)

  1. Fitted to the evaporator core under the dashboard.
  2. Requires glovebox and knee bolster removal to access.

Sixth Generation (1998–2002)

  1. Located underneath the hood on the passenger side.
  2. Need to detach lines and discharge the AC system.

Seventh Generation (2003–2007)

  1. Mounted on the firewall behind the glove compartment.
  2. Access by removing glove box assembly.

Eighth Generation (2008–2012)

  1. Positioned on the passenger side firewall in the engine compartment.
  2. Need to remove wiper cowl cover and surrounding components.

Ninth Generation (2013-2017)

  1. Fitted to the evaporator housing below the dashboard.
  2. Requires glovebox and dash trim removal to reach.

Tenth Generation (2018-Present)

  1. Located on the passenger side firewall in the engine bay.
  2. Detach hoses and discharge AC system to access.

As seen, the position varies across models but is most commonly found in the engine bay firewall or mounted to the evaporator core housing. Consulting your owner’s manual is advisable to get the exact location.

How To Access The Expansion Valve?

Accessing the expansion valve for servicing requires some disassembly depending on placement. Here are some tips:

  1. Discharge and recover refrigerant before servicing the AC system. Wear protective gear.
  2. Remove surrounding components like wiper cowls, bumpers, battery, and air intake parts based on location.
  3. Detach all hoses and lines connected to the valve before removal. Cap openings to prevent leaks.
  4. Follow instructions in the repair manual for your generation when removing dash components like glovebox.
  5. Use proper tools to detach valves from housing. Be gentle not to damage threaded ports.
  6. Inspect o-rings and seals before re-installing. Replace if worn or damaged.
  7. Reattach all fittings and lines once a new valve is installed. Evacuate and recharge system.
  8. Ensure proper airflow across the condenser and radiator after reassembly.
Expansion Valve Located On Honda Accord
Expansion Valve Located On Honda Accord

Taking the necessary precautions and following official servicing procedures is vital for safe access. Consult a trained mechanic if unsure.

Why Replace The Expansion Valve?

There are some telltale signs that indicate a faulty expansion valve needing replacement:

  1. Poor AC cooling performance or intermittent functioning.
  2. Refrigerant leaks detected in the system.
  3. Blowing warm air when AC is engaged.
  4. Frost build up on the suction/return lines from the evaporator.
  5. High pressure readings on AC gauges during operation.
  6. Blocked passages or debris obstructing valve movement.
  7. Corroded connections leading to refrigerant leaks.
  8. Failed electric cut-off switch in electronically controlled valves.

Catching problems early and replacing malfunctioning expansion valves prevents further damage and restores proper cooling.

DIY Replacement Of Expansion Valve

With the right tools and mechanical skills, the expansion valve can be replaced as a DIY project to save on labor costs. Here are some pointers:

Safety Precautions

  1. Use eye protection and gloves when handling refrigerants.
  2. Discharge the AC system correctly prior to starting.
  3. Work in a well ventilated area away from sparks or flames.

Gather The Equipment Needed

  1. Refrigerant recovery machine
  2. AC gauges and manifold kit
  3. Wrenches, socket set, pliers, screwdrivers
  4. New expansion valve for your Honda model
  5. PAG oil, seals, o-rings

Step-By-Step Procedure

  1. Locate and access the expansion valve as outlined above.
  2. Attach AC manifold gauges and recover refrigerant.
  3. Detach all lines and fittings from the valve. Plug openings.
  4. Remove faulty valve from evaporator housing.
  5. Install new o-rings and seals if required.
  6. Mount a new valve and reattach all connections.
  7. Evacuate air and moisture from the AC system.
  8. Recharge system with precise amount of refrigerant.
  9. Run AC to check for leaks and proper cooling.
Expansion Valve Located On A Honda Accord
Expansion Valve Located On A Honda Accord

With patience and care, the expansion valve can be replaced DIY. Get help from a trained mechanic if any issues arise.

Expansion Valve Replacement Cost

The replacement cost for a malfunctioning Honda Accord expansion valve can vary between $150-$350 for parts and labor. Here is a breakdown of the typical pricing:

Labor Time
Total Cost
Expansion valve – $120-$190
1-2 hours
$150-$250 (DIY)
Seals & o-rings – $15-$25
$250-$350 (shop repair)
Refrigerant – $10-$20 per lb
PAG oil – $5-$10

The bulk of the expenses come from:

  1. Type of expansion valve required for your specific model. New OEM parts tend to cost more.
  2. Labor time and shop fees if not doing DIY replacement.
  3. Amount of refrigerant and PAG oil needed to recharge AC system.
  4. Any additional repairs or parts replacement needed.

Getting quotes from a few certified mechanics is advisable to find the best value replacement cost for your Honda.

Where Is The Expansion Valve Located?

The expansion valve in a Honda Accord is typically located either on the firewall side of the engine compartment, mounted near the front bumper on the passenger side, or fitted to the evaporator core housing under the dashboard, depending on the model generation. Consulting your owner’s manual can provide the exact location.

How Do I Know If My Expansion Valve Is Bad?

Signs of a faulty expansion valve include poor AC cooling, refrigerant leaks, warm air blowing when the AC is on, frost build up on the suction lines, high pressure readings on the AC gauges, debris obstructing valve movement, corroded connections causing leaks, and failure of the electric cut-off switch.

How Many Valves Does A Honda Accord Have?

Most Honda Accord engines have 16 or 20 valves, depending on whether it is an inline 4-cylinder or V6 model. 4-cylinder engines have 4 valves per cylinder while 6-cylinder models have 4 valves per cylinder.

How Do You Adjust The Valves On A Honda Accord?

Valve adjustment on a Honda Accord involves removing the valve cover and timing belt cover, rotating the crankshaft to Top Dead Center, using a feeler gauge to check valve clearances, and adjusting as needed by loosening the lock nut and turning the adjuster screw.

How Many Valves Does A 4 Cylinder Engine Have?

A typical 4-cylinder engine has 16 valves – 4 intake and 4 exhaust valves per cylinder. Some performance variants may have 5 valves per cylinder for a total of 20 valves.


Identifying the accurate location of the expansion valve is the first step in any replacement or repair job on a Honda Accord’s AC system. While the position may differ depending on generation and engine design, common spots include the firewall, evaporator housing, and front bumper area. Following official removal procedures and taking safety precautions is critical for access. Replacing a worn or damaged valve restores optimal cooling performance and prevents refrigerant leaks.

Also Read: How Much Does it Cost to Repair or Replace a Bumper?

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Ammar Masoud

I have had a long and fulfilling career in the automotive industry, primarily with Honda and Acura. With 15 years of experience as a Honda service technician, I became highly skilled in repair and maintenance, gaining a deep understanding of these vehicles. After many years in the automotive field, I decided to embark on a second career in industrial manufacturing. It was a significant change, but I found that the skills I had honed in the automotive industry were incredibly valuable in my new role. In my current position in industrial manufacturing, the demand for quality workmanship and meticulous attention to detail is paramount. Fortunately, these are traits that I have cultivated throughout my years in the automotive industry. I take pride in applying these skills to meet the high standards expected in the manufacturing sector.