Parts for your 2000 Honda Accord-Tx valve

2000 Honda Accord TX valve: what it does and how to look after it

Yes, the 2000 Honda Accord is fitted with a TX valve (thermostatic expansion valve), not a fixed orifice tube. This is documented in the Honda Factory Service Manual for the 1998–2002 Accord (Air Conditioning section), shown in Honda’s electronic parts catalog for the evaporator assembly, and echoed by major OEM suppliers’ parts catalogues that list an A/C expansion valve for this model. The valve sits on the evaporator inlet/outlet at the HVAC case behind the glovebox area.

The TX valve’s job is to meter R‑134a into the evaporator based on superheat, keeping the evaporator cold without letting liquid refrigerant flood back to the compressor. That means steadier vent temps at idle, quicker pull‑down on hot days, and better compressor protection on long motorway runs or stop‑start city traffic.

As a service item, the TX valve isn’t something that’s replaced routinely. It should be inspected or changed when there are symptoms of metering trouble, contamination in the system, or whenever the air‑con circuit has been opened for major work. Any time the circuit is opened, new HNBR O‑rings should be fitted and lightly lubricated with the correct PAG oil.

Common signs the Accord’s TX valve may be on the way out include:

• Poor or intermittent cooling, especially vent temps that swing hot–cold
• Evaporator icing or a frosty suction line at the firewall
• Odd pressure readings (very low low‑side with high high‑side, or the reverse)
• Audible hissing at the firewall and a sluggish cabin cool‑down

Replacement is straightforward for a licensed technician: recover the refrigerant, remove the glovebox to access the HVAC case, crack the two line fittings at the valve, unbolt the TX valve, swap O‑rings, and install the new unit. Always replace the receiver/drier (or desiccant) at the same time, especially if the system’s been open or a compressor has failed. Flush where appropriate, add the specified oil balance, evacuate with a vacuum pump, leak‑test, and then weigh in the precise refrigerant charge listed on the bonnet decal. Finalise with a performance test at idle and 1,500–2,000 rpm.

Because refrigerant handling in Australia and New Zealand requires the proper licence and recovery equipment, it’s best left to an ARCtick‑licensed (AU) or appropriately certified (NZ) air‑con technician who can also verify control operation and calibrate the system per the workshop manual specs.

Does a 2000 Honda Accord use a TX valve or an orifice tube?
It uses a TX valve mounted at the evaporator. This layout is specified in the Honda Factory Service Manual for 1998–2002 Accord models and shown in Honda’s parts diagrams for the HVAC/evaporator assembly.

What are the symptoms of a failing TX valve on this Accord?
Look for weak or cycling cabin cooling, evaporator icing, a frosty suction line, and pressure readings that are out of whack. A professional gauge set and temperature probe make diagnosis more accurate.

Should the TX valve be replaced when fitting a new compressor?
If the old compressor shed debris or the system was contaminated, yes—replace the TX valve and the receiver/drier. If the compressor failed electrically or externally without contamination, a technician may reuse the valve after proving it meters correctly, but many shops still recommend replacing it as preventative maintenance.