Air conditioner blows air but not cold air

A/C is not blowing cold air, but seems to be running .

When the Air conditioner is turned ON,the Air starts blowing out.It blows the air of  same temperature as outside air.
Problem noticed on 2000 Dodge Caravan SXT model.

WHAT ARE POSSIBILITIES THAT CAN CAUSE THIS PROBLEM?



AC  blowing just a few degrees cooler than the air.This problem can be caused by

• Faulty Compressor.
• Faulty Expansion Valve.
• Low refrigerant.

HOW TO TEST IF COMPRESSOR IS GETTING ENGAGED OR NOT?

Locate the compressor and view the pulley. On the front of the compressor is a pulley driven by the belt, in front of the pulley is the clutch. If the compressor is engaging then the clutch will be spinning along with the pulley.

OK,BUT WHERE IS COMPRESSOR LOCATED ON DODGE CARAVAN?

On 2000 Dodge Caravan A/C compressor is mounted on the front of the engine and has two large aluminum/rubber lines coming out of it.

HOW TO KNOW IF SYSTEM IS LOW ON CHARGE?

To know if refrigerant is low,the A/C pressure test tool is required.Or you can Check the A/C lines.The Aluminium lines coming from compressor.

WHERE ARE THIS ALUMINIUM LINES?

See the diagram shown below,the yellow arrow is pointing towards it.

Here is a picture showing the a/c line coming out of the compressor. 

Touch and feel the cooling line.Is it warm or cool.

WHICH LINE SHOULD BE COOL AND WHICH SHOULD BE HOT?

You should have one line coming from the compressor that is hot and one pointing in diagram that should be very cold. If you don't have one that's cold then by far the most likely cause for this would be low system charge. 

HOW TO TEST THE LOW SYSTEM CHARGE?

The first thing that will need to be done is check the system charge, either with a manifold gauge set or preferred, with a recovery machine. Most likely your charge is low because of a slow refrigerant leak, or it could be low just because of natural losses. R134a molecules are small enough that they naturally escape through the rubber over time.And its natural.By time the refrigerant gets released in very slow process and refrigerant needs to be recharged.

BUT WHAT IF REFRIGERANT CHARGE IS CHECKED OK?

If the refrigerant charge is checked ok,or even after you get the refrigerant charged the problem is same as before then,its issue with compressor or expansion valve.

BUT HOW WILL I KNOW WHAT IS FAULTY OUT OF THAT?

If charge is ok then the problem could be the compressor or expansion valve.These  can be determined by looking at the system pressures. 

• If pressure is very high on the high side and very low on the low side then you have a restriction, most likely a bad expansion valve. 
• If the high side is low and the low side is high, somewhat equal pressures, then the compressor isn't working.

This details will help.

Thanks.

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1992 Chrysler Jeep Cherokee: A/C System Pressure is Same on Both High and Low?

In this condition the A.C cooling problem will be noticed.


The 1992 year Chrysler Jeep came with R12 from the factory.if Your jeep is using R134A, then it was converted.


It wasnt until late 1994-early 1995 that R134a became available.

the system calls for 38 ounces, but with R134A conversion, less is installed due to molecule differences in the refrigerant. The industry rule of thumb is 80% of called for. So for yours that will be 30ounces.

Ok, pressure should be 28-35psi on low side and 175-220psi on high side. If it were a restriction in the expansion valve, pressure would be high on the low side, but near normal on the high side.

Yours is neither sucking on the low side, nor pumping on the high side, hence the high low side pressure, and low high side pressure.

If you are positive of the system being at the correct level and compressor engaging, then only one thing causes this - weak compressor. It needs to be replaced.

So the compressor needs to be inspected and tested before getting replaced.

As per description it says compressor is faulty.

This will help.
Thanks.

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1997 Buick Lesabre: A/C stopped Blowing cold?

On Buick Lesabre 1997 Year model Vehicle it has Automatic Temperature  controls with separate Controls for driver's and passenger side temperature adjustment.

In this case first the A/C stopped blowing cold at passenger side and then stopped blowing at driver side.



Ok, the automatic climate control does not have vacuum controls. The blend doors are electronically controlled by the climate control unit and actuators at the blend doors.

Hence one side stopped working and then the other, this majorly indicates that the climate control module failing rather than both the driver and passenger side blend door.

If the shop doing the work does not have a scan tool that can test the climate control unit and the temperature blend door actuators, you will need to have another shop test it or have a dealer test the system.

This needs to be done before spending money on replacing the doors when it is unlikely that both have failed at once.

This details will help.
Thanks.

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How to replace Ac Compressor on Ford Fusion, Lincoln MKZ & Mercury Milan?

The procedure is similar for both Ford, Lincoln and Mercury car models:---

The details to replace Ac compressor is as follows:----

Removal & Installation

2.3L ENGINE

3.0L & 3.5L ENGINES:---

2.3L Engine

Specific to:

Ford Fusion 2008-2009

Mercury Milan 2008-2009

WARNING

If installing a new air conditioning compressor due to an internal failure of the old unit, you must carry out the following procedures to remove contamination from the air conditioning system.

If A/C flushing equipment is available, carry out flushing of the A/C system prior to installing a new A/C compressor.

If A/C flushing equipment is not available, carry out filtering of the A/C system after a new A/C compressor has been installed.

Install a new Thermostatic eXpansion Valve (TXV), as directed by the A/C flushing or filtering procedure.

Install a new receiver/drier desiccant bag as directed by the A/C flushing or filtering procedure.

NOTE

The O-ring seals used on this vehicle are not interchangeable with all similarly sized O-ring seals used on other Ford products. Use only the O-ring seals specified for this vehicle in the Ford master parts catalog.

NOTE

Installation of a new receiver/drier desiccant bag is not required when repairing the A/C system except when there is physical evidence of system contamination from a failed A/C compressor or damage to the receiver/drier desiccant bag.

1. If flushing of the A/C system has not been carried out, recover the refrigerant.
2. Raise and safely support the vehicle.
3. Remove the lower engine splash shield.
4. Remove the drive belt from the A/C compressor pulley.
5. Disconnect the field coil electrical connector.
6. Remove the A/C compressor manifold bolt. Discard the gasket seals.
7. Remove the 3 secondary air injection pump bolts and position the pump aside (if equipped).
8. Remove the 3 A/C compressor bolts.
9. Remove the A/C compressor.

To install:

1. To install, reverse the removal procedure, noting the following tightening specifications:
   1. A/C compressor bolts: 18 ft. lbs. (25 Nm)
   2. Secondary air injection pump bolts: 22 ft. lbs. (30 Nm)
   3. A/C compressor manifold bolt: 11 ft. lbs. (15 Nm)
      
      NOTE

      If a new A/C compressor is to be installed, the clutch assembly may need to be transferred from the old unit to the new unit.
2. If filtering of the A/C system is not to be carried out, lubricate the refrigerant system with the correct amount of clean PAG oil.
3. If filtering of the A/C system is not to be carried out, evacuate, leak test and charge the refrigerant system.

3.0L & 3.5L Engines

Specific to:

Ford Fusion 2008-2009

Lincoln MKZ 2008-2009

Mercury Milan 2008-2009

WARNING

If installing a new air conditioning (A/C) compressor due to an internal failure of the old unit, you must carry out the following procedures to remove contamination from the A/C system. Failure to remove contamination from the A/C system, if present, will result in poor A/C performance and/or damage to the new A/C compressor and other components.

If A/C flushing equipment is available, carry out flushing of the A/C system prior to installing a new A/C compressor.

If A/C flushing equipment is not available, carry out filtering of the A/C system after a new A/C compressor has been installed.

Install a new thermostatic expansion valve (TXV), as directed by the A/C flushing or filtering procedure.

Install a new receiver/drier cartridge as directed by the A/C flushing or filtering procedure.

NOTE

A new A/C compressor may come equipped with an A/C clutch disc and hub, A/C compressor pulley and A/C clutch field coil already installed. If these components are not pre-installed, it will be necessary to transfer these parts from the old A/C compressor to the new compressor prior to installation of the A/C compressor if suitable for reuse.

NOTE

Installation of a new receiver/drier cartridge is not required when repairing the air conditioning system, except when there is physical evidence of contamination from a failed A/C compressor or damage to the receiver/drier cartridge. Damage to the receiver/drier cartridge includes physical damage or moisture contamination. Moisture contamination results only from a complete loss of refrigerant, and equalization of the refrigerant system pressure with atmospheric pressure for a period longer than 1 hour. If even a slight amount of positive refrigerant pressure is present in the refrigerant system before repairs are carried out, the receiver/drier cartridge does not need to be replaced.

1. If flushing of the A/C system has not been carried out, recover the refrigerant.
2. Raise and safely support the vehicle.
3. Remove the lower engine splash shield (if equipped).
4. Remove the drive belt from the A/C compressor pulley.
5. Remove the A/C compressor manifold bolt. Discard the gasket seals.
6. Disconnect the field coil electrical connector.
7. On 3.0L engines, remove the 3 A/C compressor bolts.
8. On 3.5L engines, perform the following:
   1. Remove the 2 A/C compressor bolts.
   2. Remove the A/C compressor stud.
   3. Remove the A/C compressor nut.
   4. Remove the A/C compressor stud.
      
      
      

      

      Fig. View of the A/C compressor stud (1) and nut (2)-3.5L engine
9. Remove the A/C compressor.
   
   
   

   

   Fig. Exploded view of the A/C compressor-3.0L engine shown, 3.5L engine similar

To install:

1. Installation is the reverse of the removal procedure, noting the following tightening specifications:
   1. A/C compressor nut (3.5L engine): 18 ft. lbs. (25 Nm)
   2. A/C compressor stud (3.5L engine): 80 inch lbs. (9 Nm)
   3. A/C compressor bolts (3.0L & 3.5L engines): 18 ft. lbs. (25 Nm)
   4. A/C compressor manifold bolt: 11 ft. lbs. (15 Nm)
2. If a new A/C compressor is to be installed, the clutch assembly may need to be transferred from the old unit to the new unit.
3. If filtering of the A/C system is not to be carried out, lubricate the refrigerant system with the correct amount of clean PAG oil.
4. If filtering of the A/C system is not to be carried out, evacuate, leak test and charge the refrigerant system.

 

These details will help.

Thanks.

FOR MORE HELP GO TO: ---

Car repair guide?

http://technoanswers.blogspot.in/2012/03/car-repair-guide.html