Simply it's a valve in a refrigeration system that controls or meters how much coolant is allowed into the evaporator.
A thermal expansion valve (often abbreviated as TEV, TXV, or TX valve) is a component in refrigeration and air conditioning systems that controls the amount of refrigerant flow into the evaporator thereby controlling the superheating at the outlet of the evaporator. Thermal expansion valves are often referred to generically as "metering devices".
A thermal expansion valve is a key element to a heat pump; the cycle that makes air conditioning, or air cooling, possible. A basic refrigeration cycle consists of four major elements, a compressor, a condenser, a metering device and an evaporator. As a refrigerant passes through a circuit containing these four elements, air conditioning occurs. The cycle starts when refrigerant enters the compressor in a low pressure, low temperature, gaseous form. The refrigerant is compressed by the compressor to a high pressure-and-temperature gaseous state. The high pressure-and-temperature gas then enters the condenser. The condenser precipitates the high pressure-and-temperature gas to a high pressure liquid by transferring heat to a lower temperature medium, usually ambient air. The high pressure liquid then enters the expansion valve where the TX valve allows a portion of the refrigerant to enter the evaporator. In order for the higher temperature fluid to cool, the flow must be limited into the evaporator to keep the pressure low and allow expansion back into the gas phase. The TXV has sensing bulbs connected to the suction line of the refrigerant piping. The sensing bulbs give temperature readings to the TXV to adjust flow of refrigerant.[2] http://en.wikipedia.org/wiki/Thermal_expansion_valve
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The TXV is located at the front of dash and attaches to the evaporator inlet and outlet pipes. The TXV is the dividing point for the high and the low side pressures of the A/C system. As the refrigerant passes through the TXV, the pressure on the refrigerant is lowered. The TXV also meters the amount of liquid refrigerant that can flow into the evaporator.
Under the hood in the engine bay ,along side of the brake booster ,
The orifice tube is always located on the inlet to the evaporator coil. You sure you have an orifice tube system on that vehicle? It could be a TXV valve
Your best bet would be to take your vehicle to a qualified repair shop ! You'll have to Recover the refrigerant from A/C , drain the coolant .
Remove the evaporator outlet hose and liquid line nut from the thermal expansion valve (TXV).
Remove the evaporator outlet hose from the TXV.
Remove and discard the sealing washer from the evaporator outlet hose. Refer to Sealing Washer Replacement .
Remove the evaporator outlet hose and liquid line from the TXV.
Remove and discard the sealing washer from the liquid line. Refer to Sealing Washer Replacement .
Install a protective caps to the evaporator outlet hose and the liquid line to prevent contamination and desiccant saturation.
Reposition the heater outlet hose clamp at the heater core.
Remove the heater outlet hose from the heater core (1).
Reposition the heater inlet hose clamp at the heater core (2).
Remove the heater inlet hose at the heater core.
Plug the heater core and the evaporator core with clean towels to prevent spillage when the HVAC module is removed.
Remove the HVAC module seal nuts from the front of dash.
Remove the instrument panel (I/P) retainer. Refer to Instrument Panel Retainer Replacement .
Remove the shift control bracket. Refer to Transmission Control Replacement .
Remove the center floor air outlet duct by sliding the duct forward then up at the rear.
Remove the center I/P air outlet duct retainers from the instrument panel tie bar.
Remove the center I/P air outlet duct from the instrument panel tie bar.
Remove the instrument panel tie bar. Refer to Instrument Panel Tie Bar Replacement .
Disconnect the blower motor electrical connector from the I/P wire harness.
Disconnect the blower motor control module electrical connector from the I/P wire harness.
Disconnect the HVAC module electrical connector from the I/P wire harness.
Remove the HVAC module from the vehicle.
Are your asking about TXV valve thermal expansion valve for A/C system ? If you are ,yours doesn't have one . Has an orifice tube ,
The orifice tube is located in the liquid line between the condenser and the evaporator !
The orifice tube is the dividing point for the high and the low pressure sides of the A/C system. As the refrigerant passes through the orifice tube, the pressure on the refrigerant is lowered. Due to the pressure differential on the liquid refrigerant, the refrigerant will begin to vaporize at the orifice tube. The orifice tube also meters the amount of liquid refrigerant that can flow into the evaporator.
Unless you are referring to the
auxiliary A/C system for the back of the vehicle , it uses a
The rear TXV is located at the rear evaporator inlet. The TXV is the dividing point for the high and the low pressure sides of the rear A/C system. As the refrigerant passes through the TXV, the pressure on the refrigerant is lowered. Due to the pressure differential on the liquid refrigerant, the refrigerant will begin to boil at the expansion device. The TXV also meters the amount of liquid refrigerant that can flow into the evaporator.
thermal expansion valve (TXV). no orifice tube . look at fire wall where the a/c pipes go in look for this part .
The thermal expansion valve is located in the liquid line between the condenser and the evaporator. The thermal expansion valve is the dividing point for the high and the low pressure sides of the A/C system. As the refrigerant passes through the thermal expansion valve, the pressure of the refrigerant is lowered. Due to the pressure differential of the liquid refrigerant, the refrigerant will begin to vaporize at the thermal expansion valve. The thermal expansion valve also meters the amount of liquid refrigerant that can flow into the evaporator.
Only fairly loud hiss,would be you leaking refrigerant out of your hose set, up into the air. A slight hiss internal to the system, would only be next to the orifice screen or txv valve,as it boils off to a gas into the evaporator.
Your 2004 F150 uses what's called orifice with is located in the condenser to evaporator line. with Is the smaller line between that condenser to the evaporator. The location can be determined by the slight indentation in the line. thanks for using fix ya let us know how we did
Are you certain it is gas? is the engine running reasonably, if so you are likely seeing condensation, or water. For every gallon of fuel burned, you generate 1 gallon of water. Usually the cat and exhaust heat totally evaporates it, but not necessarily.
Did you try jumping where the Clutch relay plugs into the fuse/relay box ? Pin 87 & 30 are the compressor clutch coil power supply . If you look on the bottom of the relay you will see four set's of numbers 30 & 87 , 85 & 86 . If you take a piece of wire an jump 30 to 87 this will send B+ voltage to the clutch coil engaging the compressor . Is the PCM turning on the relay ? The Trainer 40 When the compressor won compress
The
following is a general removal procedure of A/C evaporator core. The
evaporator is removed differently from different vehicles.
For
example, a 1994 Ford Taurus/Mercury Sable instructs you to, "Using a
hot knife, cut the top of the air conditioning evaporator housing
between the raised outline."
Use a hacksaw or a hot knife to cut the case. Reprinted with the permission of Ford Motor Company.
But
a 1993 Ford Probe manual says to simply remove the blower motor and
assembly screws before separating the case halves and removing the
evaporator.
The following procedure assumes that access to the evaporator has been determined.
Recover the refrigerant.
Drain the radiator if the heater hose(s) has to be removed to gain access.
Remove the heater hose(s), if necessary.
Remove any wiring harness, heat shields, brackets, covers, and braces that may restrict access to the evaporator core.
Remove the liquid line at the thermostatic expansion valve (TXV) or fixed orifice tube (FOT).
Remove the suction line at the evaporator or accumulator outlet.
Gain access to the evaporator core as outlined in the service manual.
Lift the evaporator from the vehicle.
Drain the oil from the evaporator into a calibrated cup.
For replacement, reverse the preceding procedure. First, replace the oil with the same amount and type you previously drained.
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