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Vents Only Blow Hot On Passenger Side...

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  #1  
Old 10-01-2010, 02:14 PM
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JonnyBlaze420 JonnyBlaze420 is offline
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Angry Vents Only Blow Hot On Passenger Side...

Apparently this is another common problem??? Seems like the more I start replacing stuff on this truck, the more wrong I find with it. Argh!!!

And I should mention that I also have the "AC doesnt work at idle" issue, which I read on this forum meant that the condenser fan was junk. So I bought a new one but havent replaced it yet.

So what do I need to do to fix this heater issue? Some say heater core needs to be flushed, some say door actuators? Dash has to come out either way???? Is this true???

Maybe its time to sell the new truck.
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  #2  
Old 10-01-2010, 03:15 PM
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If your getting heat through any of the vents, it's either ambient engine temp and your core is clogged or you have the common blend door problem.
Condenser fan could be the problem or it could be that your condensor itself is beginning to get clogged. it's generally the fan that is of issue 90% of the time.
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Old 10-01-2010, 03:19 PM
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Good for you for getting the condenser fan. As for the heat, I would think it would be the blend doors
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Old 10-01-2010, 05:40 PM
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Yeah, I'll replace the fan this weekend and see what happens. Oh boy.
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Old 10-02-2010, 06:54 PM
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WHAT A BIOTCH!!! Fan assembly done. Works good now.

NOW I gotta figure out why its still blowing cold on drivers side and hot on passenger.
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Last edited by JonnyBlaze420; 10-02-2010 at 07:04 PM..
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Old 10-02-2010, 07:24 PM
AaronOregon AaronOregon is offline
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Same exact issue with heat barely blowing on driver side. Passenger side good though. Been putting it off, but winter is coming...................

Aaron
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Old 10-03-2010, 05:55 PM
ntaramorris ntaramorris is offline
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Default I have the same problem discovered last week.

When trying to use the "Heat", I have cold air on drivers side and hot air on Passengers side. Air starts hot for a second and turns cold when fan is on high.

MY truck is 02 RAM 1500 4x4 w/ 4.7 engine.

I am very interested in what you do to trouble shoot, diagnose and repair this problem.

Thanks,
Jeff
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Old 10-03-2010, 06:07 PM
trapperdan trapperdan is offline
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Angry Heater core replace it

You got your work cut out for ya. I started removing the dash two days ago. I have all the bolts and screws out and still can't get the darn thing to budge. My Ram did the same thing leaked coolant on to the carpet.
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Old 10-03-2010, 06:33 PM
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Quote:
Originally Posted by trapperdan View Post
You got your work cut out for ya. I started removing the dash two days ago. I have all the bolts and screws out and still can't get the darn thing to budge. My Ram did the same thing leaked coolant on to the carpet.
Mines not leaking coolant.
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Old 10-03-2010, 06:41 PM
AaronOregon AaronOregon is offline
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Quote:
Originally Posted by ntaramorris View Post
When trying to use the "Heat", I have cold air on drivers side and hot air on Passengers side. Air starts hot for a second and turns cold when fan is on high.

MY truck is 02 RAM 1500 4x4 w/ 4.7 engine.

I am very interested in what you do to trouble shoot, diagnose and repair this problem.

Thanks,
Jeff
Same exact issue up until today, but I got it fixed!! I put a post on here a couple weeks ago about a gurgling sound in my heater core where it sounded like air was trapped in it every morning when it was cold for the first 10 minutes. I was sure it was the dreaded blend doors. Well, today I pulled my dash plastic off (only takes about 15 minutes to pull the plastic) and checked everything and it all worked and looked great. From there, I put it all back together and went to the engine compartment. I was convinced either I was partially clogged in the heater core or there was an air pocket in there. I pulled both of my heater core hoses off half way up the block on the passenger side (you will see where one is spliced and the other goes into a "T" fitting). I hung one down at a time and blew water through it both directions full blast pressure with a water hose. Water flowed great so I knew I didn't have a clog. At this point, I raised both of the hoses as high as I could get them and poured antifreeze in a hose until it came out the other hose. I knew I had no air in there at this point. When it flowed out the other hose with it way up in the air to, I capped them with my thumb and reinstalled them on there fittings. I topped off the bottle, started the truck, left the cap of the bottle until the thermostat opened and it blows hot air again like it should. The radiator was replaced back about 4-5 months ago and it just had some air that was trapped in the heater core. I was totally happy because winter is coming fast! Good luck........

Aaron

P.S. I did change my reservoir tank a few days ago because it was leaking around the neck. This may have been drawing in air as it was cooling. Not sure, but it's as good as new now!

Last edited by AaronOregon; 10-03-2010 at 06:44 PM..
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Old 10-03-2010, 06:45 PM
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I dont have any gurgling. I just blow cold out drivers and hot out passengers.
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Old 10-03-2010, 07:18 PM
AaronOregon AaronOregon is offline
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I replied to ntaramorris...................Pull your glove box and look at your blend-door rod to see if it is working. If it is, try what I wrote.

Aaron
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Old 10-06-2010, 08:09 AM
ntaramorris ntaramorris is offline
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Default No Heat and Heat

I tried the first test AaronOregon suggested. I removed the glove box and felt behind the panel to place my fingers on the blend door actuator. I moved the dash dial from cold to hot and could feel the actuator working quite nicely and it seemed to travel as far as necessary.

I also warmed the truck up and felt the two hoses going to the heater core from the engine bay. They both felt equally warm.

I think me next attempt will be to back flush the heater core to try to see if I have a partial blockage and then try to eliminate any air pockets in the system.

It is odd to me to think that these things could cause my system to operate the way it is now: I have heat on passengers side, seems like fan air flow is less than on drivers. I have no heat on drivers side, but strong air flow. It s October time to get this all fixed. This AM is was 36 on my way to work.


Thanks for everyones suggestions!
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Old 10-06-2010, 10:03 AM
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I just redid my whole ac system and heater core this spring due to my compressor locking up and then the heater core leaking.

The heater core is tiny. Like they are an 8 inch by 8 inch square. So its not very likely to a hot and cold spot on it. You said the passenger side works fine. So the heater system is working fine. They are about 6 doors that control air flow in the hvac box. There are two doors that move together to control the temperature.

Yes the motors are turning, but those hardly fail. What usually happens is the doors will strip on the motor shaft causing them to hang there or they we break and fall off.

There is a video on here that shows a guy fixing them but doesnt remove the dash and just cuts holes in the box. I would never do this. The dash is a pain, but it isnt bad. I've done it and could probably do it again in a few hours.

You need to fix your blend doors.
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Old 10-06-2010, 10:37 PM
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Well, it was cooler out today. And now my passenger side heat is only milty warm and the drivers is still cold. Argh.
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Old 10-07-2010, 09:01 AM
ntaramorris ntaramorris is offline
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Default I now have heat from both sides.

I did as AaronOregon suggested and now I have a ton of heat from both sides!
I have only single zone heat so, AaronOregon suggested to remove the glove box and reach behind and feel if the actuator was working when moving the dial from hot to cold. I felt that it was working. So I decided to take his next bit of advice and back flush the heater core and re-fill the system.

What I did was, undo the heater core hoses from the engine and gently back flush the heater core catching the first bit with a bucket. I didnt have any fancy gear to to do this, I just had a hose nozzle that had a rounded brass end that snuggly fit into the heater hose end. I also alternated which hose I ran water through to cycle it back and forth a few times. I then reconnected everything and left the radiator cap off so that I could eliminate air and fill the system to capacity with new fluid. To my surprise, I had strong heat from both the drivers and passengers sides. I test drove the truck last night to make sure nothing was wrong -leaks, overheating etc.

Before I started the truck up I checked that the coolant tank showed the correct level at the cold mark. It was fine, so I was on my way. This AM the outside temp at 42 and I had toasty heat!


Thanks to everyones contributions to help trouble shoot.
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Old 10-07-2010, 11:11 AM
AaronOregon AaronOregon is offline
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Hey man, glad it worked out for you! I still don't really know if mine just needed flushing again (I had just done it last month) or there was a air pocket of some type in there, but it works like a champ now! I lean towards the air pocket the way it was gurgling in the heater core.

Aaron
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Old 10-08-2010, 03:56 PM
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Ok, so i got enough of my dash apart to see or feel the drivers actuator and i feel it miving and here it opening and closing when i turn the temp up and down. So that must mean i need to do a heater core flush then right?
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Old 10-08-2010, 04:33 PM
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Ok, its gotta be a plugged heater core. Just let it get up to temp and grabbed my heater core hoses in the engine bay and one is piping hot and one has no pressure in it at all and i can touch it. So i guess tomorrow ill try flushing it.
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  #20  
Old 10-09-2010, 12:10 PM
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Default Dash removal replace heater core

I have remove all bolts from the dash assembly and it still won't budge any tricks to this? Frustration is setting in
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