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Air Conditioning Troubleshooting

From : im right

Q: u drive to an ac shop and let them diagnois it. i have a 98 ram 1500 that recently last week stopped blowing cold air with the air conditioning switch on. what are some troubleshooting techniques for determining a failed component or leak thanks a lot! matt .

Replies:

From : brad

most shops charge only 30$ fo an ac ck have it ck .

From : tom lawrence

i have a 98 ram 1500 that recently last week stopped blowing cold air with the air conditioning switch on. what are some troubleshooting techniques for determining a failed component or leak you hook a manifold set to the high and low pressure lines run the system and note the pressures. based on what you find there your troubleshooting could go several ways. assuming the gauges indicate a low/non-existant charge you charge the system back up and use an r-134a sniffer to spot the leak. if you dont have one or cant get one you put some leak detection dye in the system run it for a while then using special goggles and a black light you find where the leak is coming from. once the leak is identified you recover the system replace the failed parts draw a vacuum on the system make sure it holds the vacuum then recharge to the factory specified weight and/or pressures. in all seriousness theres relatively little that could be wrong that you can fix yourself. at the very least you need a shop to recover the system before you can open it up and fix anything. and not intending this to be a flame but if you have to ask the question you asked youre most likely not capable and/or not equipped to do the repair. no offense intended but this is one of the things best left to a shop. .

From : data

double check the max/norma/bi-leval....ect switch. on mine the a/c blows warm air untill i fiddle the switch it only blows cold 1 of 5 times on max and 1/10 times on normal otherwise the compressor will not run but everything else works ok. i havnt had the time to not have a truck for a day or so it would take to repair it. . you never know... l v d a t a s p a m t r a p a t c o x d o t c o m just make it look normal to reply i have a 98 ram 1500 that recently last week stopped blowing cold air with the air conditioning switch on. what are some troubleshooting techniques for determining a failed component or leak thanks a lot! matt .

From : matt bertsch

tom i appreciate your candor and advice. i didnt know if there were some simple things that could be checked to save diagnostics time in a shop and save me a couple of bucks. thanks again i will take it into a shop. matt i have a 98 ram 1500 that recently last week stopped blowing cold air with the air conditioning switch on. what are some troubleshooting techniques for determining a failed component or leak you hook a manifold set to the high and low pressure lines run the system and note the pressures. based on what you find there your troubleshooting could go several ways. assuming the gauges indicate a low/non-existant charge you charge the system back up and use an r-134a sniffer to spot the leak. if you dont have one or cant get one you put some leak detection dye in the system run it for a while then using special goggles and a black light you find where the leak is coming from. once the leak is identified you recover the system replace the failed parts draw a vacuum on the system make sure it holds the vacuum then recharge to the factory specified weight and/or pressures. in all seriousness theres relatively little that could be wrong that you can fix yourself. at the very least you need a shop to recover the system before you can open it up and fix anything. and not intending this to be a flame but if you have to ask the question you asked youre most likely not capable and/or not equipped to do the repair. no offense intended but this is one of the things best left to a shop. .

From : tom lawrence

feel the heater hoses for an air conditioning problem the return hose should be much cooler than the input hose. only if the heater core were plugged if both are the same temperature the shutoff valve may be bad what shutoff valve or the vacuum to the valve may be missing. again - what shutoff valve .

From : redneck tookover hell

as mac will probably claim if you are in nd in january you turn on the a/c to warm up!!!!! bg yeah i know sounds screwy to me too! feel the heater hoses for an air conditioning problem the return hose should be much cooler than the input hose. only if the heater core were plugged a dyslexic man walks into a bra. .

From : redneck tookover hellredneck tookover hell

down that way visiting a friend at nas lemoore a couple years ago. quite a few barns around then i know clovis has gotten a bit less rural since then but im sure theres one or two around to hide the machine in eg or to take your sweetie out behind barns in clovis those are garages russ... youve been spending too much time in north dakota... a dyslexic man walks into a bra. .

From : old traveler

feel the heater hoses for an air conditioning problem yes for an air conditioning problem. all of my dodge trucks and vans blow the ac through the heater core. when the ac is turned on a vacuum controlled valve cuts off the hot water going through the heater core. trying to cool 190 degree air is a futil process. i have had this problem many times. i am about to insert a manual shut off valve in the heater hose on my truck. the return hose should be much cooler than the input hose. only if the heater core were plugged if he had a plugged heater core his ac may work ok. g if both are the same temperature the shutoff valve may be bad what shutoff valve locate both heater hoses. there should be a control valve in the input hose with a vacuum line going to it. if the dash control does not furnish a vacuum to the heater control valve or if the valve is stuck open hot water will continue to flow through the heater. or the vacuum to the valve may be missing. again - what shutoff valve .

From : tom lawrence

the ac through the heater core. when the ac is turned on a vacuum controlled valve cuts off the hot water going through the heater core. well not since 94 at least. no vacuum-controlled valve and the blend-air door directs air over either the heater core the evaporator or a combination of both. coolant circulates through the heater core at all times. .