hognutz

Okay so I noticed today as it was hot that there is a good 15-20 degree difference in my passenger vents to my driver vents.

I have dual zone climate control. Now one would think that it could not be my charge since the driver side blows cold but I didn't design the heater box so maybe one side has a easier path or something.

the driver blend motor is visible from the front and I can watch it actuate and I can hear the passenger motor actuating and will blow hotter if I turn it hot. it does blow colder with the AC on than off.

my logic leads me to two conclusions.

1. maybe my charge is low and this is a symptom
2. my passenger blend door is broken in some way not isolating the heater core from the cold air.

any body have any tips or advice? should I just go down and have my ac chagre checked to eliminate it as a variable or is there a way to tell if the passenger door is damaged without removing the box?

hognutz

okay update. took a drive with my multimeter and thermal couple. I think my charge might just be low.

88 degree's ambient

temperature low with ac off

93F D 95F P

AC on

62F D 79F P

heat on

137F D 127F P

seems like It should blow colder than 62 with the AC on full blast.

Totallyrad

It's a low charge. I just went through this a couple months ago and there have been allot of threads on the subject this summer. Evacuate and recharge, add some dye to look for the leak. Mine took a little over 1 pound.

LeonT

I went to Wal-Mart, bought a can of R134a with the built-in pressure gauge, ran the A/C on Max for a few minutes, hooked up the hose to the low-pressure connector, put the whole can in, and bingo, problem solved.

That was several months ago and still works great.

This is a very common problem with these trucks, but the fix is (usually) pretty easy.

hognutz

Yeah bought and 18oz can with a gauge now all vents are blowing ~50f at idle.

I will just have to watch it and do leak test if it does not last too long. I don't mind $20 every five years.

I wonder how long it has been getting progressively worse though. I will just have to measure the vent temps every 6months or so for piece of mind.

Ram Daddy

Cool...I (passenger actually)just noticed last week mine`s doing the same thing , I was worried it was the blend door hopefully mine will just need a charge of freon

ssandlin

Which port is the low pressure side, the one up front by the radiator or the one in back on the accumulator?

tryNto

The 1 in back...

SDHNTR

Anyone got a picture of the port where you hook the can up to? Or a better description?

Got the same problem.

justin mcfall

According to the dealer04.5-05 don't have blend door issues..

MikeyB

I don't have a picture but the port is located right next to the dryer/accumulator between the passenger side battery and firewall. Should have a plastic screw on cap protecting it.

MikeyB

Ram Daddy

Well , had my system evacuated and recharged and now the A/C blows even less cold than it did before ....in all vents , and the pass. side is still warmer than the drivers side.

I guess I`ll take it to the A/C shop we use at work , and see what they come up with....I didn`t think it could be that easy for me

dieselfreak21

Could be a broken recir door as well.

Ram Daddy

That`s what I`m thinking , because I can smell diesel fumes inside the truck with it on recirulating mode...never had that before.

CamperAndy

They put too much freon into the system.