Air Conditioning... isn't

From : jmc

Q: my trucks about 7 years old but acs seen less than 4 years of actual use three years in england i think we used the ac once. recently its begun blowing not-so-cold air. in fact the air temp out of the vents seems about the same whether the ac is on or not. im guessing it needs to be recharged but a coworker said that my ac isnt old enough to need that... should i be looking at other reasons as well everything seems fine i can hear the compressor come on truck isnt running hot or anything. ive got an appt next week since its already in the 100s here much of the time though today thankfully it only got up to about 79f. jmc .

Replies:

From : mike simmons

my trucks about 7 years old but acs seen less than 4 years of actual use three years in england i think we used the ac once. recently its begun blowing not-so-cold air. in fact the air temp out of the vents seems about the same whether the ac is on or not. im guessing it needs to be recharged but a coworker said that my ac isnt old enough to need that... should i be looking at other reasons as well everything seems fine i can hear the compressor come on truck isnt running hot or anything. ive got an appt next week since its already in the 100s here much of the time though today thankfully it only got up to about 79f. jmc the a/c system may be low on refrigerant. does the compressor come on and stay on for a fairly long time or does it come on and then shut off fairly rapidly if it cycles quickly short cycling that is usually an indication that it is low on refrigerant. if the shop finds that it is low on refrigerant have em do a leak test. if no leak is found have them add a fluorescent tracer dye to the refrigerant when they recharge the system. this will make it easier to find the leak if one is present. good luck! mike .

From : jmc

suddenly without warning mike simmons exclaimed 12/10/2007 748 pm my trucks about 7 years old but acs seen less than 4 years of actual use three years in england i think we used the ac once. recently its begun blowing not-so-cold air. in fact the air temp out of the vents seems about the same whether the ac is on or not. im guessing it needs to be recharged but a coworker said that my ac isnt old enough to need that... should i be looking at other reasons as well everything seems fine i can hear the compressor come on truck isnt running hot or anything. ive got an appt next week since its already in the 100s here much of the time though today thankfully it only got up to about 79f. jmc the a/c system may be low on refrigerant. does the compressor come on and stay on for a fairly long time or does it come on and then shut off fairly rapidly if it cycles quickly short cycling that is usually an indication that it is low on refrigerant. if the shop finds that it is low on refrigerant have em do a leak test. if no leak is found have them add a fluorescent tracer dye to the refrigerant when they recharge the system. this will make it easier to find the leak if one is present. good luck! mike thanks. i hadnt noticed how quick its cycling. whats a normal compressor cycle jmc .

From : mike simmons

suddenly without warning mike simmons exclaimed 12/10/2007 748 pm my trucks about 7 years old but acs seen less than 4 years of actual use three years in england i think we used the ac once. recently its begun blowing not-so-cold air. in fact the air temp out of the vents seems about the same whether the ac is on or not. im guessing it needs to be recharged but a coworker said that my ac isnt old enough to need that... should i be looking at other reasons as well everything seems fine i can hear the compressor come on truck isnt running hot or anything. ive got an appt next week since its already in the 100s here much of the time though today thankfully it only got up to about 79f. jmc the a/c system may be low on refrigerant. does the compressor come on and stay on for a fairly long time or does it come on and then shut off fairly rapidly if it cycles quickly short cycling that is usually an indication that it is low on refrigerant. if the shop finds that it is low on refrigerant have em do a leak test. if no leak is found have them add a fluorescent tracer dye to the refrigerant when they recharge the system. this will make it easier to find the leak if one is present. good luck! mike thanks. i hadnt noticed how quick its cycling. whats a normal compressor cycle depends on the ambient temp but probably at least 30-45 seconds run time... many times longer... a short cycle is more like 3 seconds on 10 seconds off... 3 seconds on... ten seconds off... you get the idea. mike jmc .

From : nunya

my trucks about 7 years old but acs seen less than 4 years of actual use three years in england i think we used the ac once. recently its begun blowing not-so-cold air. in fact the air temp out of the vents seems about the same whether the ac is on or not. im guessing it needs to be recharged but a coworker said that my ac isnt old enough to need that... should i be looking at other reasons as well everything seems fine i can hear the compressor come on truck isnt running hot or anything. ive got an appt next week since its already in the 100s here much of the time though today thankfully it only got up to about 79f. jmc the worst thing you can do for an ac system is not running it at least once a month. the seal around the shaft in the compressor must have oil circulated every once in a while to keep it doing its job. my first guess would be a leak in this area. you need to hook up a set of manifold guages and see how much pressure you have on both the high side and low side. if it is low on refridgerent then top it off and run it a while. if you loose that batch then start looking for leaks. a decent leak detector kit is not that expensive. i personally dont believe in adding system sealer. it just adds problems down the road. michael .