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Hi new member here. So I have a Chrysler 200 C it's a 2014. Here a while back the check engine light came on. Went down to AutoZone and they hooked it up said that it was throwing a code for the thermostat. Well since then the check engine light has went away. It has never overheated. But whenever the air conditioners on blows out hot air. Can somebody help me out with this?

2016 Chrysler 200 S, 1998 Sebring JX
2,077 Posts
Welcome to the forum. The cooling system and A/C (HVAC) system depend on one another to an extent, but an A/C that blows warm sounds like an A/C problem. It could be a separate, unrelated problem.
The thermostat just controls the amount of hot coolant that goes to the radiator for cooling.

The 2 systems do share the cooling fan as the A/C condenser is mounted in front of the radiator for cooling as well.
Always diagnose first. Does the electric fan turn on when the engine gets warm or the A/C is turned on? Do you hear the A/C compressor clutch kick on?

Don't just add a can of refrigerant if the system is low or if you think the systems is low. Over-filled A/C systems have their own set of problems. The refrigerant runs in a closed system, if the system is low, you have a leak.
The leak must be fixed first. Avoid using aftermarket 'sealers', they might cause other problems and if it gets into shop reclaiming equipment, it can cause headaches for the shop.

Diagnosis is best done with a gauge set. When the compressor clicks on and the cooling fan runs, the high-
side gauge should climb and the low-side gauge should fall. Give-or-take, you want about 200 psi (1400 kPa) on the high-side and 30 psi (200 kPa) on the low-side.
If the compressor isn't pumping, the high and low side pressures will be about equal at some mid-point pressure.

Refrigerant oil is carried around the system by the refrigerant, so any refrigerant leak should leave a wet spot. The oil has a UV dye in it that glows green under UV (black) light. This helps to locate a leak.

The system is simple really. The thing that helped me visualize a working system was to think of water absorbing heat and turning into steam, then releasing heat and turning back into water again. Just on a different scale of temperatures and not at ambient barometric (air) pressure.
It may be hard to think of 'boiling' as a cooling (absorbing heat) action, but it is. Just as the formation of morning dew is a heating action on cool windows and leaves or the fogging of a cool bathroom mirror.

Safe & effective A/C (or refrigeration) work can require special equipment. Wear safety glasses and possibly gloves. To empty a system (reclaiming), makes the system safe to open for service.
The system is then drawn down to a vacuum to remove all air & moisture (evacuation) before recharging. Make sure that the system can hold a vacuum. Then recharge with the proper amount of R-134a refrigerant. If a significant amount of oil is lost, that amount of PAG oil should be added during the charge.
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