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


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  #1  
Old 06-07-2014, 03:22 PM
Beanpole82 Beanpole82 is offline
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Default need some help with AC work

If anyone can point me in the right direction I would be happy. My 04 ram ac not blowing cold , I done took it to two diff shops , the first shop it was working fine and the other said it was no Freon in the system so he hook the gauges and vacuumed out the air and recharged the system but as he was charging the system the cans wouldn't take without me giving it gas then it got a lil cold when he sprayed the water hose on the condenser , now it gets a lil cool in the morning but hot during the day . The fan kicks on and the compressor kicks on so please help me out . Thanks for any help
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Old 06-09-2014, 02:27 PM
rcflyer8410 rcflyer8410 is offline
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Default AC checks

Can you take it back to the shop that charged the system? Checking the pressures requires more than one of those quick and dirty gauges you buy at the auto parts store. You have to look at your low side and high side pressures for a valid reading, which requires a more robust set of gauges. If you have access to those, respond back with the high and low side pressures.

Some other things:
1) If the system truly lost it's charge, you clearly have a leak. This is a closed system. Was a leak identified? Was it even leak tested?
2) Depending on the size of the leak and the level of which the system was opened, at the very last the accumulator probably should have been replaced as well.
3) Does the suction / low side line feel cold (this is the line connected to the accumulator - typically black and looks like a canister)?
4) Is the condenser fan motor running - I believe that model has a dedicated condenser / fan.
5) Any obstructions on the condenser - the front typically gathers dirt, bugs, etc.. You can purchase a cleaning solution at the auto parts store and clean with hose and water. Use low pressure only - a high pressure wash will damage the fins.
6) What is the temperature differential of the output air in the cab? In other words, what is the temperature inside the cab and what is the air temperature out of the vent? You will need a simple thermometer to verify. Check the temperature from all of the vents - it is common for the blend doors to break which can cause warmer air to mix with the cold air and usually only effects some of the vents.
7) Watch the compressor - make sure the clutch is engaging and staying engaged. Is it "short cycling" ? In other words, does the clutch engage and then after a short time disengage and constantly repeat that cycle?

Troubleshooting the AC system can be a bit complex but these are some basic things. If the system had truly lost it's entire charge, I suspect you have a significant leak. Was it working for a shot time after you left and then started to blow warm again? That would make sense if you had a leak and the symptoms are consistent with a low charge. The refrigerant doesn't just disappear...
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Old 06-09-2014, 02:28 PM
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Default

Have you tried recharging it yourself? Buy a $25-$30 refill kit from Walmart. Remove the cap off top of the black canister on passenger side firewall, screw on the filler nozzle and follow directions. I did my 05 yesterday, it showed a bit low, now it's blasting cold air. If that does not work, perhaps one of the aluminum lines has chaffed tru, and needs replacing.
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Old 06-10-2014, 12:22 PM
Beanpole82 Beanpole82 is offline
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Default

Yes I tried recharging myself with a kit first but no luck so the shop I took it too hooked the gauges and vacuum out all the air and recharged but still nothing . It does blow a little cold in the morning on the lowest setting but bout 10 minutes its back blowing hot
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Old 06-13-2014, 05:53 PM
Simple guy Simple guy is offline
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tried pressure washing the condenser out? I'm thinking there might be a problem with the valve think it's called the TXV thermoexpansion valve? If the condenser fan is working and working correctly and there's no short cycle only thing i can think of is there's no pressure drop to cause the cooling affect... unless the evaporator is clogged and nothing is able to evap.
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Last edited by Simple guy; 06-13-2014 at 06:07 PM.
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Old 06-20-2014, 12:45 PM
Beanpole82 Beanpole82 is offline
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Default thanks for the help

I finally figured it out . MY truck didn't have a orfice tube in the line so we put one in and recharged it , now its blowing like I like .
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