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Heating & Cooling 3rd Gen Dodge Ram Heating & Cooling Problems and Questions.


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  #1  
Old 05-31-2010, 09:30 PM
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Default A/C Actin Up... Some help please

Hey Guys!

I had a problem with my A/C this weekend. When I was driving down to Grand Rapids, Michigan yesterday to pick up my rims it happened. On the way there everything was alright and working well. The drive was 4.5 hours each way.

On the way back thought something happened and I do not know what. The A/C did not work at all. The air was blowing through but it was just the fan and no cold air. I do not know what the heck happened. I pulled off checked the belts and everything, it seemed to be alright. I turned it off for about an hour and rolled the windows down. It was a hot day so it really sucked without the A/C, it kinda made the drive pretty shitty. After the hour I turned it back on and it started to work again.

After I turned it on after waiting the hour it worked fine. It is still working but I just want to know what the heck it could have been. I really dont want it to happen again, and if it does at least your help will help me fix it.

All ideas would be great!! Thanks in advance for your help and comments!!!
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Old 05-31-2010, 09:49 PM
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Sorry to hear that............Not my area for sure..........Could it be like a relay not working correctly??????Im guessing Scat. It kind of sounds like it could be a connection of some sort.
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Old 05-31-2010, 10:01 PM
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I was thinking it was the A/C clutch or something.

Thanks Bones I will look into something like that if it happens again
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Old 05-31-2010, 10:08 PM
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It sounds like this may be your problem, it used to happen a lot when I worked for a living. It happened on our heavy construction equipment right down to our pickups.
When i worked in the tomato sheds out in the desert, our propane fork lifts would do it too.

AIR CONDITIONER PROBLEM: INTERMITTENT COOLING

An A/C system that blows cold air for awhile then warm air is probably freezing up. This can be caused by air and moisture in the system that allows ice to form and block the orifice tube.

Evacuating the system with a vacuum pump will purge it of unwanted air and moisture. Evacuation should be done with a vacuum pump that is capable of achieving and holding a high vacuum (29 inches) for at least 30 to 45 minutes.

For best performance, an A/C system should contain less than 2% air by weight. For every 1% increase in the amount of air that displaces refrigerant in the system, there will be a corresponding drop of about one degree in cooling performance. More than 6% air can cause a very noticeable drop in cooling performance, and possibly cause evaporator freeze-up.

Air can get inside a system through leaks, by not evacuating the system prior to recharging it, and/or by recharging the system with refrigerant that is contaminated with air. Recovery equipment can suck air into the recycling tank if an A/C system contains air or if the system has a leak. For this reason, the refrigerant recovery tank on recycling equipment must be checked and purged daily. On some equipment, this is done automatically. But on equipment that lacks an automatic purge cycle, tank pressure and temperature has to be measured and compared to a static pressure reference chart.

Some refrigerant identifier equipment can detect air in the system as well as other contaminants. An identifier should be used to check the refrigerant before the system is serviced to prevent cross-contamination of recovery and recycling equipment.

Possible causes of intermittent cooling in a manual A/C system that might be caused by an electrical problem include:

Faulty low pressure cutout switch. This switch prevents the compressor from running if the refrigerant level is low. If the cutout switch is not reading correctly, it can prevent the compressor from coming on.

Faulty compressor clutch. The magnetic clutch on the compressor requires full battery voltage to engage. If the voltage to the clutch is low, or the clutch coils have too much resistance, or the air gap in the clutch is too great, the clutch may not engage to drive the compressor.

Faulty compressor clutch relay. Check to see if the relay is receiving voltage when the A/C is turned on. Also check the relay wiring and ground connections. If bypassing the relay with a jumper wire or routing battery voltage directly to the compressor clutch makes the A/C work, the relay is probably bad.

Faulty A/C control switch. The switch may be worn and not making good contact when it is turned on.

Some possible causes of intermittent cooling (or no cooling) on automatic A/C systems include all of the above, plus:

A problem in the control module or control head (this usually requires using a dealer scan tool to read fault codes and perform self-diagnostics).

A bad temperature sensor (an ambient air temperature sensor, interior air temperature sensor, evaporator temperature sensor, or sunload sensor). Again, a factory scan tool is usually required to perform diagnostics on the system.

http://www.aa1car.com/library/ac98.htm
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Old 05-31-2010, 10:18 PM
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I haven't worked in A/C for quite sometime however I use to install aftermarket units. From the way you described it, it sounds like your evaporator or expansion valve is freezing up. The result would be no cooling until the ice clears. If it happens again just turn your hot/cold selector a bit to the hot side this will cause the compressor to cycle and not allow things to freeze up. There is a better description here, http://youracauthority.com/acterms/AC-Freeze-Up.shtml.
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Old 05-31-2010, 10:27 PM
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Wow thanks guys! That really helped me out! From what I saw I think it is freesing up. I guess when I let it sit for that hour and it was so hot it freed up. This is why it worked after it all went away!

So how do I prevent this happening again???
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Old 06-01-2010, 11:02 AM
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Scat, you can turn down the temp dial (a bit closer to the warm side) until the compressor starts to cycle. That should prevent a freeze up. If the compressor will not cycle (i.e. on all the time which you can tell by seeing that the center part is turning along with the pulley) you may have a relay or pressure switch problem. If that is the case you will need some service work done. Also if your dryer is saturated it may need to be changed (that is also a trip for service). Hope that helps somewhat, let me know how you make out.
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Old 06-03-2010, 09:00 PM
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yea i have a few trucks in my fleet that do it from time to time when they are on long distance drives. it gets a spot in the lines were water freezes, it typically means the accumulator needs to be changed.(the canister the catches the moisture in the lines) and prolly needs the inline filter changed as well.
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