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Message
Truck A/C blowing hot at idle (Updated on pg 2)
Posted on 6/8/15 at 4:55 pm
Posted on 6/8/15 at 4:55 pm
Well, I haven't really paid that much attention to my A/C until today because it really hasn't been that hot, but it definitely is only blowing vent air when it is idling. Once I am underway, it starts cooling off, but not as much as I'd like. I just drove for 30 minutes with it on full blast, and never came close to turning it down.
Hopefully yall can help me figure this out. It is an 04 2500HD 6.0
Fan clutch is good
Engine Temps fine
Compressor kicks on and off
R134 levels good
Any ideas?
Hopefully yall can help me figure this out. It is an 04 2500HD 6.0
Fan clutch is good
Engine Temps fine
Compressor kicks on and off
R134 levels good
Any ideas?
This post was edited on 7/23/15 at 7:30 pm
8
Posted on 6/8/15 at 4:56 pm to Hammertime
Same here
Not exactly "hot" but it ain't cold
Not exactly "hot" but it ain't cold
This post was edited on 6/8/15 at 4:57 pm
Posted on 6/8/15 at 5:04 pm to Hammertime
Dirty condenser, evaporator, or radiator or radiator fan not blowing enough. At idle, there's no air flowing across the condensor to cool it. Possibly a bad fan clutch.
Posted on 6/8/15 at 5:18 pm to Shexter
It's not overheating at all. No mud up front
Posted on 6/8/15 at 5:30 pm to Hammertime
I had a 2001 Silverado and had the same problems. Started a couple years after I bought it. Dealership claimed on multiple trips that there was nothing wrong and did not hear of anyone else having problems. Just sold it last year. Couldn't go through another summer without a cold a/c.
Posted on 6/8/15 at 5:32 pm to Hammertime
When you say R134 level is good, what did you use to measure it (also what were the low-side pressures)? Also, just because the compressor cycles while you are looking at it under hood doesn't mean it's doing so properly while driving. You can have "good" R134a levels according to most DIY gauges and have marginal to shite performance from your A/C.
This post was edited on 6/8/15 at 5:33 pm
Posted on 6/8/15 at 5:33 pm to Bull11
All they'd have to do is stick a thermometer on it. I try and stay away from places that charge me $100/hr
Posted on 6/8/15 at 5:45 pm to Hammertime
My old truck was doing same thing. It was the condensor fan was bad. Blew cold while going then hot while sitting at a red light.
Posted on 6/8/15 at 5:50 pm to Hammertime
Sounds like it needs freon to me. Might want to re-check that.
Posted on 6/8/15 at 5:57 pm to Hammertime
I've seen Dodges do that and it was related to vacuum. The engine needed to be revved up to create enough vacuum to have the AC going thru the right ducts.
Posted on 6/8/15 at 6:01 pm to Hammertime
Try replacing the a/c pressure switch.
It a switch on the dryer bottle, that take 5 min to change out for about 25 dollars
It a switch on the dryer bottle, that take 5 min to change out for about 25 dollars
Posted on 6/8/15 at 6:03 pm to DownshiftAndFloorIt
I just have a shite set of dual gauges, so I guess I can try and find someone with a real set. Either way, I think it was like 33/150
Posted on 6/8/15 at 6:14 pm to Hammertime
Look it up to be sure but I think the suction pressure should run close to 50 pounds with it being as hot as it is right now.
ETA: I think 33 is definitely low. What happens is the compressor kicks off on low suction pressure. Eventually it climbs enough to kick on for a second, but it won't run much at idle without plenty of airflow over the condenser without enough pressure in the system. You can't condense hot vapor when the system pressure is too low.
ETA: I think 33 is definitely low. What happens is the compressor kicks off on low suction pressure. Eventually it climbs enough to kick on for a second, but it won't run much at idle without plenty of airflow over the condenser without enough pressure in the system. You can't condense hot vapor when the system pressure is too low.
This post was edited on 6/8/15 at 6:24 pm
Posted on 6/8/15 at 6:17 pm to Hammertime
if it is truly ok on refrigerant, then maybe your compressor is getting a bit weak...
however, I can't say I have ever had a truck with an AC that would just freeze me out at a flat idle...they are designed to run optimally at a little higher rpm...
however, I can't say I have ever had a truck with an AC that would just freeze me out at a flat idle...they are designed to run optimally at a little higher rpm...
Posted on 6/8/15 at 6:19 pm to DownshiftAndFloorIt
quote:
Sounds like it needs freon to me. Might want to re-check that.
agreed....
Posted on 6/8/15 at 6:26 pm to Hammertime
Did you rev the engine a little while observing the pressure? My Ranger's AC worked fine when I checked it a month or two ago (cooler weather too which is important), about 40 - 45psi low side. Got into warmer weather and I'd notice my AC would cycle during acceleration and blow warmer for a few minutes until I was under steady cruise. Checked my low-side pressure again and it was closer to 50 psi which was still "good" according to the gauge for the ambient temperature. When I revved the engine while watching the gauge it would spike a little and trip the pressure limit switch. Little too much R134a. Bled it down to 40 psi and it's been fine and ice cold ever since.
Posted on 6/8/15 at 6:31 pm to Clames
Wonder if Chicken would allow us to start a pool for threads like this. Everybody who wants to suggest a fix puts up $5. First correct response gets the pot 
Posted on 6/8/15 at 7:23 pm to Clames
Nah, didn't rev it up. Just connected the gauges and watched it cycle on and off. I guess I am going to try and find someone with a good set of gauges this week to check it.
If it was low, wouldn't the compressor not cycle?
If it was low, wouldn't the compressor not cycle?
Posted on 6/8/15 at 7:24 pm to jorconalx
quote:
jorconalx
Ah, no.
Posted on 6/8/15 at 7:43 pm to Hammertime
Hammer 9 out of 10 times it's the fan clutch on those 6.0 gas guzzling bastards
I have changed a truck load of them over the years, see if you can grab it and stop it while it's running if you can it's history or put your mega shop fan in front if the condenser and see if it starts cooling or you could spray the condenser with water and check it like that also.
Good luck
I have changed a truck load of them over the years, see if you can grab it and stop it while it's running if you can it's history or put your mega shop fan in front if the condenser and see if it starts cooling or you could spray the condenser with water and check it like that also.
Good luck
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