Air conditioner

AC replaced 8 months ago- new compressor and the works. Immediately, when idling, it blew hot air- mechanic said that wS normal. Now blowing hot air all the time. Took it back, he claimed there was a refrigerant leak in the dash and it will be very expensive and labor intensive to fix. He said he added "5 ounces of gas" and further stated he put some "sealant" in it to seal any leaks. When I left the mechanic shop, the temp of air coming out of vents did not get lower than 80 degrees.

My car has 115000 miles.
My car has a manual transmission.

Experienced mechanics share their insights in answering this question :
You need to take it to a different mechanic to have a diagnosis. You either leaked out the refrigerant or the system was overcharged. Have the pressures checked. The sealer will not seal a leak in an evaporator or a metal part. It may help rubber seals get more soft and seal up as long as they are not torn or damaged. If you’d like a fresh pair of eyes on this issue, a certified technician, like one from YourMechanic, will be able to diagnose the issue with your A/C and help you fix it accordingly.

How to Identify and Fix Common car Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced mechanics :

Water leaking from under the car can be normal, especially on hot days when you`ve been cranking the A/C at full blast. Car A/C systems are actually designed to allow water to drain out of your vehicle. The system cools the cabin by pulling humidity from the air, and that moisture needs a place to go!
Wear and tear of the rubber parts of your system is the most common cause of leaks. While much of your air conditioning system is made of metal, including the high pressure lines, parts of the system are rubber.
The most frequent cause of leaks in home air conditioners is a clogged drain line. When the drain line is clogged, water cannot drain from the overflow pan and out the drainpipe (or outside, depending on the configuration of the AC).
Refrigerant often leaks out of the AC system at places where there are worn out O-rings, seals and/or hoses.
Freon leaks are typically found at the schrader valve, valve cores, evaporator coil, copper lines, “U” connectors, weld joints, electrical connection to the compressor body, or the copper tubing. Most of the time, the leak will usually occur in the evaporator coil.
Freon and other refrigerant chemicals are vital for the continued function of the air conditioner unit, so if some freon starts to leak, you`re bound to have trouble with your unit. Luckily, these leaks can be fixed if they`re caught early, and the lost freon can be replaced.
When the summer season is in full swing and humidity is high, it`s normal for your air conditioner to drain anywhere between 5 and 20 gallons of water each day.
The simple answer is, “Yes, but you absolutely should not do this.” If for any reason you suspect that your AC has a refrigerant leak, turn off the system and call for professionals to repair the leak and recharge the refrigerant to its factory-set level.
One of the best methods for determining if you should repair or replace your AC unit is multiplying the age of the unit by the repair cost. The standard rule of thumb is if the result is $5,000 or more, it is time to replace the unit. So, if your unit is 10 years old and the repair is $345, the result would be $3,450.
A dirty air filter can sometimes be the culprit of a leaking AC. Luckily, it`s one of the easiest causes to fix. When a filter becomes too clogged, air cannot pass through over the evaporator coils.
Generally speaking, the operation of the AC system should not create a coolant leak to occur, as coolant does not flow through the AC unit in any capacity. However, an engine will “work harder” when the AC is on, so smaller leaks may increase in volume when this occurs.
In fact, it is normal for your air conditioning unit to leak small amounts of water during routine functioning because it is producing condensation. As the system`s evaporator coil cools warm air that passes over it and absorbs heat and moisture from the air, condensation forms naturally.
If the leak is very slow, it is likely to disperse before causing harm. If you have a sudden discharge, you need to get out of the vehicle and ventilate It!

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

When idling, car overheats and A/C blows hot air – 2001 Saturn L100
ANSWER : Hello. The most likely cause of the issue that your are having would be a faulty cooling fan. The cooling fans purpose is to keep the radiator and condenser for the air conditioning cool during the idling function of the vehicle.

If the cooling fan is not working, this will cause the radiator and condenser to get very hot. When the radiator and condenser get hot, this can cause the vehicle to overheat and the air conditioning not to work. When the vehicle is driving at higher speeds, the force of air that is created towards the vehicle will flow through the radiator and condenser and therefore keep them cool. I would recommend having the cooling fan checked to make sure that it is working properly. If not, I would recommend having the cooling fan replaced.

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air conditioner not blowing air from dash vents, but blowing air from side vents
ANSWER : A few different items can cause the air to not blow out of the dash vents. The most common are a blend door or a control switch. The best method for the AC diagnosis feature can be found in the vehicles owners manual. I recommend having your AC checked by a qualified technician, such as one from YourMechanic, to have the problem diagnosed and repaired correctly.

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Hot air mixed with cold blows from air conditioning
ANSWER : Hey there. You will most likely have to have a mechanic bypass the heater coolant lines to have this resolved. Your A/C may not be controlling the air flow inside the evaporator correctly out of the vents and may be the blend door actuator stuck in the heat position. Have the AC system diagnosed first before bypassing the heater.

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Air conditioner blows hot air. 1995 Mercedes-Benz E300
ANSWER : Hi there, thanks for writing in about your 1995 Mercedes-Benz E550. This could be a variety of issues, such as no pressure or low refrigerant levels, a bad compressor clutch, or a compressor not engaging correctly. Check to see if the cooling fans are on when the AC is running. Most systems are designed to have them run when the AC is on. Also, check to be sure the compressor is engaged. Look to see if the pulley is spinning when the car is running with the AC on. If you need help with this, a qualified professional from YourMechanic can come to your car’s location to inspect the AC system and pinpoint the necessary repair.

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Air conditioner blowing warm air. Heat blowing warm air. Neither hot or cold
ANSWER : If the A/C system is full and pressures are reading correctly, and the cooling system is in proper working order (thermostat opens, no overheating, etc.), then most likely the problem lies with the dash. The climate control head unit may be at fault. One or more blend doors behind the dash may be stuck or broken. If you’re unable to fix this issue yourself, consider YourMechanic, as one of our mobile technician can come diagnose the issue with your A/C firsthand and help you fix it accordingly.

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Air conditioner blows hot air on the left side and cold air on the right side
ANSWER : A common issue across many makes and models with dual AC in the temperature blend door actuator failing and causing drastic temperature differences between the driver and passengers sides. Have the HVAC system inspected by an experienced professional to find the specific cause. A certified professional from YourMechanic can come to your car’s location to diagnose the AC and assist with proper repairs.

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air conditioner started making loud screeching noise and started only blowing hot air, then the noise stopped but still only blows
ANSWER : The noise is possibly from a failed compressor clutch or the compressor itself is faulty. Another possibility is the pulley bearing on the front of the compressor has failed. The issue should be fairly evident to the inspecting mechanic after some simple tests. To resolve this, the recommended diagnostic is an a/c system inspection. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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Have heater for the front window while air conditioner is off
ANSWER : The heat is from the heater core of the engine. You are feeling the air that comes in from the fresh air intake vent for the A/C heat system just below the windshield on the outside. This is normal and default for defrost when you have turned it off but it should still seal heat from getting to the windshield. The problem is that the blend doors in the evaporator heater case are not sealing 100 percent. It’s possible for this to be a normal condition for Jeep Liberty’s. If you feel like it’s still an issue, I suggest contacting a certified technician, like one from YourMechanic, who can diagnose the issue with your A/C firsthand and help you fix it accordingly.

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