Its hot! Warm air is coming from the vents. 
A fast solution.

a c cooling problem

Taken from: http://answers.yahoo.com/question/answer;_ylt=AhCZFVOk50clNY1iDXUyxRUazKIX;_ylv=3

Got a? ...A C cooling problem? This describes how a universal tune up product from Mega Power Additives raises your a/c system vent temperature.

Be warned - most mechanics are told not to mix additives into the a/c system as it may correct the oil. A lawyers legalease to not show up the oils PEC weakness. 


The heat problem: A simple solution.

  By using Mega Power #120 for removing sludge and friction, the two problems that make your compressor run cooking hot - and raises vent temperatures, you remove the causes of your cooling trouble. Therefore, Mega Power  #120 restores proper cooling operation.

Mega Power #120 Install Recipe.

   1- Add 4 ozs JB 80 Or Mega Power 120 Penetrating Oil to the low side. Vehicle running - a/c set to cool. Fan on high.

   2- In a few seconds lower vent cooling temperature will return.

If replacing a failed a c compressor.

   This recipe flushes out years of acid and residue accumulation in the system to start the new compressor off to its longest life and lower cooling value. 

Directions.

Step One: Remove any Freon in the system. Remove the  2 a/c hoses - high and low pressure from their end connections. Spray 5 short blast of Mega Power 120 into each hose, the evaporator, and condenser.

Next, blow 3 short soft blast of compressed air into each hose, the evaporator, and condenser to rinse out loosen residues - holding a rag at the exit end to catch the crud.

Have someone hold a shop rag or cloth towel over the opposite end where the flush of air sends the dirty residue out and into the rag. Repeat adding 5 squirts of Mega Power and repeat the blow-cleaning process. Do so with hoses evaporator and condenser.Replace old service control inline.

Step Two

Install new O-rings on each hose. Install new line filter and valve in the system. Install 3 oz of compressor oil and 3 oz of Mega Power 120 in the system. Close up the system. Check for vacuum leaks. Then add required ozs of freon. End of service.

How the a/c system is protected with Mega Power #120. 


All a/c compressors - have two functions. They suck fluid Freon, the cooling agent, from the condenser, then send it to the evaporator under pressure. 

There, interior heat passing over the coils transferring that heat into the freon which turns back to liquid passing its heat to outside air -  and boils and carries the hot freon liquid to  the condenser.  And back to the compressor to repeat the cycle.

During this cooling task it turns into vapor and minute deterioration occurs making acids, and the cooling problems.

Mega Power will neutralize acids PAC Oil cannot in the system. Acids, residues, and friction - the  systems enemy, are removed by Mega Power #120 service dded as expalined above. 

Order Mega Power 120 here.

Other a c cooling problems

How the system is protected with Mega Power #120. 

As residues and acids from coolant breakdown or metal specs from a failing compressor plugs up the system - or weaken suction and compression, a change in pressure or suction occurs such, a hi or lo sensor is triggered and the compressor shuts off - saving it from quick destruction. No cooling occurs.

The  a c cooling problem system vent problems

Little doors - directed by your dash cooling heating control knob or button positions determine which door and cool or heat flow. These doors work by - not the compressors suction; but from the motors suction. As suction is applied to the door it opens or closes - directing the choice of air set by the heat/cool controls.

But, over time, the doors either leak suction -no good, or your motor age and residue buildup causes lower suction - also, no good. In either case, when suction drops real low the door closes off cool air and that lets heat out all of a sudden.

To complicate things more, there are other suction-activated devices - there are about a half dozen connected to the motor. These can also develop a leak and cause suction levels to drop and indirectly cause the a/c doors to switch. A rough idle may appear also from such a leak. So, one of these situations would definitely cause the sudden heat flow you feel. Does that sound like what is happening? More about your a c heat problem...

a c cooling problem What the mechanic will do

A mechanic who does a/c work will quickly determine if its the compressor or vent door or vacuum leak is at fault.

Engine wear and tear can cause sticky engine valves - or both wear and sticky valve conditions do develop much lower engine suction - no good either. Such lazy operating parts do drop suction significantly as you climb a hill, or as you labor the engine going from stop to higher speed, like from a red lite.Time for an engine overhaul.

Instead of that overhaul idea, a product from a company called Mega Power makes a treatment to increase engine vacuum. It works by cleaning the valves and adding a coating to valve stems and pistons. This cleaning/coating can help restore what wear took a way as long as nothing is broken. Mega Power can again boost vacuum to as good as new. This has long term good going for it, it would seem, as it brings back former motor performance. that is what will kick up engine vacuum and engine power. A inexpensive way to help extend motor life and end this sudden door problem - even if ether is a minor vacuum leak. Most likely you have a vacuum problem. That may be your a c heat problem cause.</ul>

My conclusion: Try a mechanics advice as to which is your problem. Anyhow, your are now a bit better informed on all the options - as I think is your desire, before you consider the next step.


Source(s):
A discussion of Mega Power Products available,.

Then blow a soft blast of compressed air into the same end and blow out the dirty residue.

Think of this like medicine to clear your lungs. Only your flush out sludge so your cooling efficiency returns again.

A C cooling problem.  This describes how to flush clean and tune your a/c system.  This restores compressor function to restore cooling, avoiding an expensive repair. The service reconditions chemically and mechanically.

Even if many years old,  and the compressor is still working, you can bet residues cause the no cooling problem. 

AC cooling problem. Blows hot air suddenly. Why? Our fix.

Your Answer:

This could be the start of failure for your a/c compressor, a small freon leak, or both. Or a vacuum problem. Here's how it all connects to the hot air and the fix.

All a/c compressors - have two functions. Suck fluid freon, the cooling agent, from the condenser, then send it to the evaporator under pressure. There, it cools the air you would love to always feel blowing across your hot body. During this cooling task it turns into vapor and is pushed out to the condenser where it loses the heat picked to do the cooling, and is recycled again thru the compressor.

Should residues from coolant breakdown or metal specs from a failing compressor plug something, or a leak develop, a change in pressure or suction occurs such, a hi or lo sensor is triggered and the compressor shuts off - saving it from quick destruction. No cooling occurs. However...

I don't think any of that is your problem. This is it. A/C air and heat circulates from the same area under the dash. Little doors - directed by your dash cooling heating control positions determine which. These doors work by - not the compressors suction; but from the motors suction. As suction is applied to the door it opens or closes - directing the choice of air set by the heat/cool controls.

But, over time, the doors either leak suction -no good, or your motor age and residue buildup causes lower suction - also, no good. In either case, when suction drops real low the door closes off cool air and that lets heat out all of a sudden.

To complicate things more, there are other suction-activated devices - there are about a half dozen connected to the motor. These can also develop a leak and cause suction levels to drop and indirectly cause the a/c doors to switch. A rough idle may appear also from such a leak. So, one of these situations would definitely cause the sudden heat flow you feel. Does that sound like what is happening? More about your a c heat problem...

A mechanic who does a/c work will quickly determine if its the compressor or vent door or vacuum leak is at fault.

Engine wear and tear can cause sticky engine valves - or both wear and sticky valve conditions do develop much lower engine suction - no good either. Such lazy operating parts do drop suction significantly as you climb a hill, or as you labor the engine going from stop to higher speed, like from a red lite.Time for an engine overhaul.

Instead of that overhaul idea, a product from a company called Mega Power makes a treatment to increase engine vacuum. It works by cleaning the valves and adding a coating to valve stems and pistons. This cleaning/coating can help restore what wear took a way as long as nothing is broken. Mega Power can again boost vacuum to as good as new. This has long term good going for it, it would seem, as it brings back former motor performance. that is what will kick up engine vacuum and engine power. A inexpensive way to help extend motor life and end this sudden door problem - even if ether is a minor vacuum leak. Most likely you have a vacuum problem. That may be your a c heat problem cause.

My conclusion: Try a mechanics advice as to which is your problem. Anyhow, your are now a bit better informed on all the options - as I think is your desire, before you consider the next step.


Source(s):a c cooling problem
A discussion of Mega Power Product usage by george christ


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