Air conditioner blowing warm air

Hey guys,

So my AC in my truck isn't working so well, it has been blowing warmer than normal, and was pretty hot today. It was a 90 degree day too.


A week ago I was driving down to the shore for the 4th and my girlfriend said something was dripping from under the glovebox while we were running the air...

My passenger side of my truck was wet and I went to clean the AC drain and nothing came out. Also, whenever the AC is on there is no water coming from the drain. Also, when the ac is on, there is a strange noise coming from the passenger side under the glove box right around where the AC drain is.

Would it be possible that the evaporator is clogged?

Thanks,

Tom

 

no, sounds like its freezing up from low Freon.

before it started dripping, have you noticed the fan doesn't blow as strong after the a/c has been on a while

start the truck, put the fan on high speed with a/c on and temp to max cold, then check under the hood and watch the clutch on the front of the compressor to see if the compressor is running, if not, then its low on Freon because you have a leak somewhere, so add a can of Freon to get it cooling again for now.

later on you can look for the leak and how to go about fixing it

 

I am pretty sure that the compressor is running

 

is the big a/c line coming out of the firewall ice cold? or just sorta cold? or not cold at all?

 

Borrow a set of gauges and add freon to these pressures using the left temp chart for your outside temperature if the pressures are low. If they are high and still blowing warm air you need to be looking for a blockage if your compressor is running. You need to check with the compressor running, ie ac turned on.

 

Update: Compressor works. I added R134 to my truck, the inital pressure was around 25-30psi around 85 degrees so thats pretty low. I filled it up to 50psi. AC is ice cold now, and it drains properly. I think I might have a slow leak somewhere as this have definitely occurred over the lifetime I have owned the truck (nearly 4 years). I will wait and see how the pressure is over the next week. Hopefully it is fixed!

 

when Freon leaks out, it usually carries some oil out with it, so look for any place with an oily film on it around fittings and hose connections.