i have a 1999 escort se 4 door. The ac blows out cold air but does not seem cold enough, i checked the system pressure and its fine, the compressor is running fine. what could be wrong and how to i fix it? thanks in advance.
i could only check the low pressure side which was 40lbs i think which the gauge said that was within the range it needed to be. the compressor is cycling maybe once every 30 seconds once it has been on for a while
Place a meat thermometer in one of the vents. That will tell you the temp of the air coming out. At lower fan speeds colder air will come out since it is circulated through the system slower. Also if the outside temperature is higher the AC will not appear to work as well since it has to cool much hotter air. I have an 98 Tracer and everything appears to work great until the outside temp hits above 85. Then the vents blow a few degrees less. For a 11 year old car I cannot complain though.
Usually when the AC starts getting weak and doesn't cool right, the R134a charge is getting low.
A quick and tempting fix is to buy a can of refrigerant and throw it it in.... But charging really best left to a pro with the proper recovery/charging equipment.
What you want done is to have the existing R134a pumped out completely and then have a vacuum put on the system to remove any traces of air or water that might be present.. Once that is done, then you just have to put the correct amount of R134a back in and you're in business.
If there's a bad leak, the vacuum test will show it... Having the 'perfect' amount of refrigerant installed means your system will be running at peak performance. (If there is too much or not enough R134a in the system, its ability to cool will be reduced.