air conditioning unit blowing extremely hot air...tried putting freon in, didn't help. checked codes - 55 is flashing? - stumped as to what's wrong.

 

I've had this one... trying to remember... with the digital heat control - 99 concorde

On the hottest day of the year, the heater was running on HOT/DEF/MEDIUM speed, which I know is the failsafe mode. I took out a fuse (I think the a/c?) and it went to HOT/DEF/HI. The digital heater panel reads " -- " and will turn itself back ON when you turn it OFF.

I thought it might be the digital heater control, so I swapped it (always have a spare for these...) - NO CHANGE! So it wasn't the control.

I believe I pulled fuses one by one, and one of them 'fixed' the problem. I think it was the 'raised' fuse which also controls the engine/security etc (I think)

I'm not sure why it happened. My 1999 Concorde seems to kill the battery (parked) MUCH faster than any car I've ever had. Electronics do not like undervoltage and can do weird things when it happens - and it happens more than average in a Concorde... Security system also does not like low voltages...

 

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Short history... 2009 T&C 3.8: A/C blows cold, no problem. Intermittently, it would blow HOT. I'm not talking "not cold", I mean full on hot air. After finding this forum, my blender door was broken, replaced it, and wahlah, right? NOT! It did it again 2X. Head scratching, what's up? Looking at eManuals' pictures and diagrams, I notice there is a temperature sensor on the evaporator in the lower corner. When I replaced the blend door, I noticed a few pine needles in the fan. Curious? Looked up and forward through the blend door housing and saw a few more that had been caught by the mesh. Because of the angle, I didn't realize how many. I removed the windshield wipers and cowl. On passenger side, from the left looking at the engine, there is a square hole, then four rectangular holes. I shoved a small vacuum hose into the first rectangular hole aiming back towards the square hole (towards the passenger door), and heard many leaves, and maybe a few acorns being removed. No problems since. The science behind, and why? The A/C system is designed to keep temps somewhere between 60 to 85 degrees F. If your A/C is chilling right along and the airflow is obstructed over that before mentioned evap temp sensor, it is no longer having the ambient air to warm the sensor. It will get super cold. Much colder than the lowest (60-ish), setting the system is designed to maintain. So, what does it do? It adds hot air as long as that evap temp sensor is covered, trying to get the temperature back into the 60 to 85 deg range. If the leaf drops away, your A/C goes back to normal. Leaf flips up in front of sensor, it blows hot again. Doesn't cost anything and can be done in an hour or two. I hope this helps. Be cool (as you want to be).