Last week while driving home I notice that my a/c was feeling to hot for normal operation. So I stoped by a local parts storeand picked up a can r-134 put it in my system. It cooled for the ride home but the next morning it blew hot again.
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Re: a/c blows hot even after i have put in freon.
Yes you have a leak. Take it to a shop for the test. It can be done in a few minutes not costing you an arm an leg. 10 chances to 1 it is an O ring like already suggested. They should not even sell this stuff to the public! The prob of a leak needs to be corrected before adding anything. Thank God it wasn't your fuel tank! LOL Frankster016
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car air conditioner blowing hot air is cause by either a leak or a clogged condenser, since it has a freon in it then it might be a case of clogged condenser but this is just a contributing factor, it is possible that the leak is small that you wont even notice that the freon is not enough for the a/c to blow cold air.
when you are stoped does the car idle fine. when the rpms are low the compressor does not get the pressure up high enough. you may need to get you idel turned up a little or your vaccume advance may have a vaccume leak.
Make sure your are using the right amp fuse, if so you will need have the fan relay checked by a mechanic. The porblem would be in the wiring of the car since there is not much to a air conditioning system in a civic. As for the air not being cold you may have a leak in the plumbing of the air system that needs to be fixed because freon is very expinsive.