Heat is blowing on passenger side, but cold air is blowing on driver side on 2002 Dodge Ram 1500

When I turn on the heat, the passenger side is receiving warm/hot air but drivers side is receiving cold air.

by in Clinton Township, MI on December 07, 2009
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16 answers 12 comments
ANSWER by , December 07, 2009
My 2002 Ram with the 4.7L V8 is doing the same thing. I will let you know if I find the problem.
COMMENT by , December 18, 2014
The blend door is broken and is in need of replacement, very common in that truck. They will tell you it takes 5 to 7 hrs labor, but I did mine myself in about 2&1/2 to 3 hrs. no fun at all. I replaced the cracked dash while I had it out. patsr
ANSWER by , October 05, 2010
i have the exact problem on my 2002 dodge ram, if u find out the problem let me know...and i will do same
ANSWER by , October 07, 2010
Wow, mine is doing the same thing. Anyone that can help with this would be much appreciated... 2002 Dodge Ram 1500 Air conditioner works on both sides, cold air Heater only blows heat on passenger side, blows cold on drivers side
COMMENT by , October 10, 2010
what is is there is a door that was designed for dual climate control inside the dash....even if you may not have dual climate control you still have the door for it and it fails...it takes at least 8 hours as you have to take almost the whole dash out to get at it
COMMENT by , December 01, 2010
Do you happen to know witch actuator
COMMENT by , August 16, 2013
it is not the blend door .the blend door controls the blending of inside and outside air intake only.
ANSWER by , October 18, 2010
I have the problem listed above. A/C works fully but no heat on driver's side only on passenger's side.
ANSWER by , November 10, 2010
its the blend door actuator
ANSWER by , December 23, 2010
I had the same problem Iwas told by dealer ship that they have problems with t he blend doors braking inside the heater box wich you 'd have to remove the dash. I removed my dash and heater box to find nothing wrong.But what I did find was that the heater core was clogged. you don't have to remove the dash to flush it, remove both 5/8 heater hoses going through fire wall under hood use a garden hose to back flush heater core DON'T USE FULL PRESSURE spray into 1 side of heater core until water runs through freely then do the other( back and forth) then this should fix
COMMENT by , October 28, 2013
i tried this and it didnt work . took dash out and checked all act.doors couldn't find anything wrong . ac works on drivers side not on passenger side .just the apposite on heat . i will say that once your on highway for a bit you start getting some heat out of driver side.
COMMENT by , November 17, 2013
this millenia chevy truck having same problem, thought some internal control problem, but will try the hose flush, even though I don't see why both sides aren't affected the same way.
ANSWER by , December 23, 2010
yes I had the same problem on my 2002 dodge ram took the dash apart removed heater box nothing was broken, the heater core was half clogged,the way it sits in the heater boxd, the front 1/2 of the heater core goes to the pass side 3 vents the other 1/2 goes to drivers 2 vents,I have single zone heat in truck but all dodge heater boxes are universal for both types of heat dual & single zone. I would suggest before removing the dash, remove to 5/8 heater hoses going to heater core under hood (fire wall) and back flush heater core with garden hose NOT FULL PRESSURE spray into heater core 1 side than the other back and forth till it runs freely. my hoses were hard to get off I had to use razor blade and slice hoses the long ways to get off theres still enough hose to slide back over and clamp,also i do agree with other people the blend doors do break but it sounds like you have the same problem I did bleading the air out took a little while KEEP AN EYE ON TEMP GAGE AND COOLANT LEVEL after starting.I've never had my heat so hot since i've owned this truck
COMMENT by , January 24, 2011
thanks that fixxed it you're not a rookie
COMMENT by , January 24, 2011
I couldn't beleived this fixxed it
COMMENT by , February 08, 2011
i have the same problem in 2001 mitshubishi eclipse
COMMENT by , November 26, 2011
Thanks! This worked for me too! Although I'd like to add that you can just remove the heater hoses from the closer ends instead of at the firewall. This way you can more easily get the water into the hoses. This whole process only took me about 15 minutes, and my heat is like NEW AGAIN! Amazing! I'm sure a repair shop would have gouged me big time and said it was a heater core or something expensive. Thanks again!
COMMENT by , February 15, 2012
I'm currently having the same problem with my 2003 Honda Accord. I hope with what is said on here it will fix my car as well im tired of not having heat on both sides. Hopefully I wont screw up anything because I'm completely new at this but its better then spending more money which I dont have. Thanks again
ANSWER by , April 08, 2012
switch the heater hoses i have dodge ram 3500 had the same problem switched the heater hoses and it worked fine.4/8/2012
ANSWER by , January 19, 2013
I,m looking to find the answer to this
ANSWER by , November 17, 2014
my truck is a 2003 dodge ram 2500 diesel. I had the same issue with my truck blowing hot air on the passengers side mostly. when I initially turned on the heat it would blow hot air on the drivers side and it would get cold right away. about a week ago I added stop leak in the radiator against my sons advise. after reading some answers here I flushed out the heater core by attaching a garden hose to one end and letting the other end open to clean out. initially it was coming out ok but then it clogged up and blew out the gunk that I had put in to stop a leak that I thought the motor had. the heater works just fine now. I called the company and they were willing to pay for a heater core replacement if that did not fix the problem.
COMMENT by , June 04, 2015
mine is doing the same thing but, need the a/c to work now that it summer now. did it affect your a/c is it did your heat. I have it a part now to the where I can see that all actuator are working and can that blended door are working through the main vent.
ANSWER by , December 18, 2014
heater core is clogged.. flush it!
ANSWER by , October 17, 2015
I have a 2008 Dodge Ram 2500 SLT. I have done the heater core flush and everything was very good. The heat on my truck only works on passenger feet and face. The defrost and driver side does not work at all. I have tried and tried everything i know how to fix this issue besides tearing the dash apart. Ideas?
ANSWER by , November 10, 2015
2010 dodge journey heater blows hot on drivers side and Coold on the passenger side. Took it to the dealer ask them to change the bad acucurarator. They said it was good and working like it should. So I looked at it myself and it is working. Can anyone tell me what to do to fix this problem?
ANSWER by , November 15, 2015
I just got an 03 Ram. It had the same problem blowing cold air on the driver's side. I flushed the heater core with a garden hose, problem solved. It took 15 minutes.
ANSWER by , November 29, 2015
my rear end is humming what do I need to do get a use one. they want 2000 that alot
ANSWER by , March 04, 2016
I have a 2003 Laramie. I did the heater core flush and it fixed the issue. Got a good slug of gunk out and now it blows hotter than ever. Easy to do, disconnected the hoses on the passenger side of the engine, just had to remove the air cleaner and the hoses were easily accessible. No need to remove the hoses at the firewall. I thought it might be the switch, which is at least $200; glad I didn't go that route.