1999 Mercury Grand Marquis Q&A
1999 Mercury Grand Marquis Question: a/c blows hot air
Disconnecting things is not a good way to determine what is wrong, it doesn't give any real clues as to what might be bad. You'll need to see if the compressor is getting power when the A/C is not cooling, if it isn't then the electrical circuit to the compressor needs to be fault traced to find the problem. These systems are fairly complex so I advise taking it to a professional. - blindsquirrel
i have a ford tauras that does that sometimes try disconnecting the neg. battery cable for like 15 minutes then reconnecting. works for it - Visitor
Your A/C needs recharging. An amateur can to it by themself by getting a recharging kit from a part store for like $30. If you take it to a mechanic, they'll charge you at least $100. But when you're A/C won't blow cold air anymore, it needs recharging. - amadhatter53
This fix is great. Set air temp between 40 and 90 degrees. . Turn off climate control with off button. Hit off and floor at the same time. It will enter into self test. You will see a spinning wheel on the display. let it go through the test. Good Luck, - scl45
DO NOT ADD FREON TO YOUR SYSTEM UNLESS YOU CHECK THE COMPRESSOR HEAD PRESSURES FIRST - unlike the suggestion below. I see several people a week that overcharge their systems with AC Pro or similar systems. Always check with gauges... if empty, pull system in a vacuum first. Repair any leaks. "Your A/C needs recharging. An amateur can to it by themself by getting a recharging kit from a part store for like $30. If you take it to a mechanic, they'll charge you at least $100. But when you're A/C won't blow cold air anymore, it needs recharging. - amadhatter53" - partsgt
how do you program a/c control?blows hot air.
When I turn the air control switch to any position defrost, feet, vent ac they all work except just blows out hot air. even with the cold hot switch on cold.
Have troubleshot everything. Blend door works. Blows hot air constantly on AC and heat. Temp doesn't change at all. Compressor works, Condenser no leaks. Please help
My A/C is blowing very hot air. What is my problem?
Inside the car the air condition only blows hot air but when checking the AC under the hood the lines are frosted over to indicate the AC is working.