Question about 2001 Volkswagen Passat

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My 2001 Passat A/C evaporator freezes up on humid days. What is supposed to control the compressor to keep the evaporator temperature above 32 degrees F? After 20 minutes driving on hot humid days, the air flow dwindles to nothing, and a few minutes after turning off the manual A/C control, the center vent spits out small ice particles with increasing flow of very cold air until the evaporator is cleared and it can be turned back on for another 20 minutes. It has done this for six years and the dealer has denied any problem.

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Check and make sure you have water draining out the drain tube and that it is not blocked. next humid day run your a/c and see if you observe water dripping on the ground if so look on the fire wall and see if you can find the drain tube, if so make sure it flows free.

Posted on Jun 23, 2009


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1 Answer

My 2007 Town & Country Limited has the front evaporator freezing. Is there an evap. temp. sensor or anti-Icing switch in this system?

There will be a sensor located somewhere on the evaporator (inside the car) that turns the compressor off when the temperature is close to freezing. All car a/c have them to prevent icing up. I suggest buying a manual for the car if you want to do it yourself or take it to a local car refrigeration shop if you don't. It may cost a bit as it can be difficult to gain access to the evaporator in many cars.

Jul 09, 2017 | Cars & Trucks

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Air Con

no the pipes should not be cold and wet but if you just have stop using the aircon recently it will do that for a while till all the gas is out of the system so yes its sorta normal

Oct 02, 2008 | 2001 Chrysler PT Cruiser

1 Answer

Where is a air temperature control sensor in a 2004 GMC Canyon located at

There is none on your vehicle , temperature control is by a cable .There is a evaporator temperature sensor , this is used to keep the evaporator from freezing up !
Air Temperature Control The air temperature control regulates the HVAC system air temperature in any mode. An air temperature control cable mechanically links the air temperature control to the air temperature door.
Evaporator Temperature Sensor The evaporator temperature sensor will not allow an A/C request to the body control module (BCM) at temperatures less than 0°C (32°F).

Sep 14, 2015 | GMC Cars & Trucks

1 Answer

Wht is a TXV

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]

Jun 18, 2014 | 2006 Saturn Vue

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May 16, 2014 | 2007 Chevrolet Silverado 1500 2WD

1 Answer

Idle issue when a/c is on

the ac compressor is controlled by the thermostat connected to the evaporator under the dash When the cab air temperature reaches the set temperature the ac compressor switches off . IT is called cycling. If it causing a problem with the engine rpms then there is a sensor problem not an ac problem so run the fault codes to determine where it is . ECM's are programmed to maintain constant rpm regardless of the load placed on the engine at idle.

Mar 23, 2014 | 2001 GMC Savana Cargo

1 Answer

2008 Town and Country air conditioning problem. my air conditioner works great (good and cold) both mornings and evenings when the outside air temperature is under approx. 80 degrees. Problem is - during...

when an ac unit that is working well in the cooler parts of the day but fails when it is hot , it is indicated that there is excessive gas in the system
ac gas is not added by the can but by reading the pressure on 2 gauges
one connected to the inlet side of the compressor and the other to the high pressure side of the compressor ( there are forums where gas has been added by the can that has resulted in hose failure and compressor damage)
it works like this ac liquid gas is released in to a low pressure area in the evaporator ( under the dash) and the heat of the car boils the liquid off. That makes the air cold
the gas is then sucked in by the compressor and converted back to a liquid in the condensor in front of the radiator
there the heat from the compression of the gas is removed by the condenser fan and the liquid is then sent back to the evaporator
If you have excessive gas in the system it cannot be compressed back to a liquid (too much heat in the gas to transfer to the air)and so the high pressure side safety switch turns the compressor off to prevent damage
hence no cooling in the hottest part of the day
as to you statement about the amount of water on the road
If the humidity is 14-20 % there is very little water vapor in the air for the evaporator to remove and so there will be little water separated from the air in the car
AC units cool the air in a car by removing the water vapor (humidity) from the air in the car ( humidity is what makes you sweat and feel uncomfortable as you will know when it is 80% or higher )
using an a c along with the heater ( climate control) is the quickest to defog a windscreen
So have the ac tested for correct pressure by a professional accredited ac shop

Mar 21, 2017 | 2008 Chrysler Town & Country

2 Answers

2001 Passat A/C blowing intermittant cold and

HI. this may be a charge issue and the system should be recharged if this is the case. I recommend going the the below checks so that you may eliminate other causes as well before the recharge.

1. Check Drive Belts - The air conditioner utilizes a drive belt that supplies power to rotate the compressor, which is basically a refrigerant pump. If the belt fails the compressor has nothing to drive it, inspect and replace as needed to restore operation. If belt is intact proceed to the next step.

2. Check for Compressor Clutch Engagement - Turn the air conditioner to the "on" position and set controls to the coldest setting. Start the engine and allow to idle. Then open the hood and inspect the clutch at the front of the compressor, is it turning? "Engaged" if so, the system has enough refrigerant to activate. If the system is low on refrigerant it will not work properly. In this case an air conditioner recharge kit is needed to recharge the system. If the system is low on refrigerant it could cycle on and off, making a ticking noise. If the compressor clutch is not turning proceed to next step.

3. Inspect for Refrigerant Leaks - If the system has a large leak and no refrigerant remains it will not activate. First test system for a static pressure charge, with the engine off attach an ac gauge to the low side pressure port and check the state of charge. Depending on outside temperature there should be between 50 psi and 80 psi. (Cool and warm). A refrigerant leak detector is needed to inspect for leak, but if you do not have a leak detector there is an alternative method. The air conditioner system is designed to run with oil suspended in the refrigerant to lubricate the system. Check for oily residue outside the system by inspecting all hoses, compressor, condenser, evaporator or receiver drier and replace any component that has failed.

4. Inspect Fuses - Check under dash panel and under hood power distribution center. Replace failed fuses as needed, recheck system. If the new fuse fails when reinstalled a short circuit is present and requires diagnosing with a wiring schematic, follow circuits to locate short, repair as needed and recheck system.

5. Check Temperature Control Vents - The vents inside your car are controlled by a cable, electrical servo or vacuum servo. If the temperature blend door is not functioning properly it will cause warm air from the heater to exit the vents. To check this start the car and allow the engine idle, next turn the blower motor speed on low, switch the temperature control from warm to cold while your ear is close to the vents. You should hear the door move inside the heater box as it swings from open to close. If not, insect for a vacuum leak or a shorted motor in the servo, repair the leak or replace the servo motor.

Aug 06, 2009 | 2001 Volkswagen Passat

1 Answer

A c starts off cooling good then compressor starts kicking in and

Several possible causes. Knowing the state of refrigerant charge would be helpful. Assuming it has a 'full' charge (full charge 680 Grams = 1.50 Pounds) Most common causes of AC problems:
1. Thermostatic switch (sensor) malfunction in the evaporator - allowing the evaporator to ice up. Check the vent temperature (using a cooking thermometer) to see if the temperature gets near or below freezing (32 Deg F.). If so, the thermostatic switch in the evaporator is defective. Replace it.
2. Refrigerant UNDER-charge. If the temperature does NOT get near freezing, then you need a set of AC gauges to check the compressor head pressure (High side) and the suction (Low side). High side pressure (nominal) is 229 PSI (+ - 20 psi) @ 2000 RPM. Low side (nominal) is around 20 to 40 psi. NOT common problems:
1. The magnetic clutch coil on the compressor... as it heats/warms up, the coil windings could be going 'open" circuit which would turn the compressor 'off.'
2. Compressor inefficiency (worn out).
3. Expansion Valve
4. Clogged Condensor

Mar 19, 2009 | 2004 Hyundai Elantra

1 Answer

E320 air conditioner

I had the same car till last year ,, but my Ac was not original fitted , pipes ,,,, all copper !! it suppose to be other material like aluminium.

By the way which model is your car, i,m talking about my old 93 E280

Jun 16, 2008 | 1993 Mercedes-Benz E-Class

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