AC Not Blowing Cold ?

Saltillo Express · Sep 29, 2015

Thought I would check and see if anyone could point me in the right direction on this.

2012 5.7 65K miles. Yesterday - AC ice cold. This morning not blowing cold. Fan blows air, just not cold. Vents switch to all settings without issue. Heat works fine.

Where do I start? Thanks.

SilverStreak88 · Sep 29, 2015

What are your outside temps? could just be low...

Saltillo Express · Sep 29, 2015

90 plus. Muggy Florida heat.

SilverStreak88 · Sep 29, 2015

Same here - is it blowing warm, hot, when you change where the air blows does it go to that location or is one of them not blowing? (i.e.) I change my air flow to floor, but it only blows on defrost, but it blows in every other mode fine.

Saltillo Express · Sep 29, 2015

switches to all locations perfectly. one of the freon lines is cold the other is extremely hot. not sure if that is normal. you don't happen know anything about a condenser fan?

SilverStreak88 · Sep 29, 2015

Does it come on with HVAC system? When your air is completely OFF it will be on, but when your air is ON, it should be spinning always.

Saltillo Express · Sep 29, 2015

I cant see past the clutch fan. I'm assuming it's the electric fan - but I can't tell if it's spinning or not.

jwheeler · Sep 29, 2015

Check and see if the compressor is engaging when a/c is on. If not, check fuses and then check the refrigerant line pressures.

14RAM4X4 · Sep 29, 2015

My 2014 did this the other day. Was blowing ice cold. Stopped to run into the store. Then it was blowing cool, but not cold. Did this for about 10 minutes. I ate lunch and when I started it back up again, it was cold again. Fan was working fine. I kept trying different setting on the thermostat, recirc, defrost, floor vents, etc. Nothing made a difference. It fixed itself and hasn't done it again since Saturday. I hope it doesn't happen again. I HATE having to take it into the dealer so they can take 1-2 days to look at it.

Good luck

SlowRoller · Sep 29, 2015

jwheeler said:
Check and see if the compressor is engaging when a/c is on. .

One line was cool and the other was 'hot', so compressor was engaged,, at least at that time,,,.

Been a run of leaky evap cores lately,,,

Hope not,,,, =( $$$$$$$

Hemi395 · Sep 29, 2015

It could be the blend door isn't fully turning to the cool side of the HVAC system. If the refrigerant lines were cold and the compressor was engaged, it should be blowing cold air.

One question, did you have it on fresh air or recirculate? My 03 Mustangs evaporator would ice up in minutes if you had it on fresh air on a hot and humid day. It would blow pretty warm air until I turned it off long enough for it to thaw out. It was crazy annoying so I could only use max ac. Haven't had that problem on my truck at all though.

Hootbro · Sep 29, 2015

Until you get a set of AC gauges on it to check the low and high side pressures, you are stabbing at it.

Contrary to the myth that AC systems are "sealed" even the best ones will loose on average and ounce of refrigerant per year and need the occasional top off service.

Magna · Sep 29, 2015

There's a thermistor in the evaporator that senses the temp and turns off the compressor to keep the evap from freezing up. The failure mode is open, which keeps the evap from icing up and burning out the compressor.

It's a $20-$40 part and is buried under the dash. Replacing it will take about 4-6 hours if you do it yourself or about $600-$700 if someone else does it.

This signature is AWESOME!!!

Saltillo Express · Oct 2, 2015

thx to all. Magna that's a hot piece of information right there. I had a shop near me tell me the evaporator was bad. Which I thought was a stretch on a 3 year old truck with only 62K miles. I'm going to take back to the dealer and mentioned this thermistor. F'ng Chrysler.

Magna · Oct 2, 2015

It's not just Chrysler. My wife had a Mercury Milan that did the same thing. Ford quoted me $650 and I bought the part on Amazon, followed a YouTube video from a Ford tech and saved myself $630.

The part may be called any of a few different things...air temp sensor, Evan temp sensor, cabin air sensor, but they're all the same thing.

This is my signature. There are many like it but this one is mine.

Saltillo Express · Oct 2, 2015

Nah I know, I was just kidding.

We've owned so many Dodge's we're used to parts falling off. LoL.

SilverStreak88 · Oct 2, 2015

Magna said:
It's a $20-$40 part and is buried under the dash. Replacing it will take about 4-6 hours if you do it yourself or about $600-$700 if someone else does it.

This signature is AWESOME!!!

Trust me I know all about behind the dash...

I had to do all of this

To get to this

To replace this $120 part

Hemi395 · Oct 4, 2015

SilverStreak88 said:
Trust me I know all about behind the dash...

I had to do all of this
View attachment 58811
View attachment 58812

To get to this
View attachment 58813

To replace this $120 part
View attachment 58814

That looks like so much fun. I have yet to have that pleasure on a vehicle...

Saltillo Express · Oct 4, 2015

Silver - those pictures stress me out man.

I could never do that. LoL Back to the dealer on Tuesday. Hoping for the best.

SilverStreak88 · Oct 4, 2015

Good luck man.

AC Not Blowing Cold ?

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