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Q: The A/C is blowing less than cold, almost room temp, even after adding Freon. on 2007 Mercury Milan

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Even dialing "max cool", the temp is barely cool. A possible leak, or is blockage more likely? Can the thermostat affect the performance of the A/C ?
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Is the compressor coming on? Was the R-134 added using gauges, machine or the DIY stuff from the store?
Yes, the compressor is running and the low pressure tube under the hood is very cold. The freon was added by a mechanic-friend, using tools and gauges. The temp reading at the dashboard vent is 40 degrees, but it is not cooling interior when it is 90 or higher outside.
make sure your blend door (controls the mixing of the hot from heater core and cold from evaporator)is operating correctly. If equipped with a heater control valve make sure that it's closing when a/c is on. In most cases the engines' thermostat will not effect the a/c performance. Hope this has been a little help.
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