Tuesday, July 3, 2012

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. 
Air conditioner Line diagram

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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