No heat on passenger side vents and little heat on drivers side

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I checked heater core hoses and they are both hot to the touch. I also checked the operation of the blend door actuator and it is working. I have single zone climate control. Any ideas??

dunes09 in Mountain View CA

Jan 27, 2014

3 Replies

Popular Answer

Master S2Kon Dec 7, 2015

Okay, so I ran into this problem also. Driver side vent blowing at 120 degree and passenger blowing at 110 degree at idle but drop down to 90 degree while driving. Customer Vehicle is a 09 dodge journey RT with 63k. I work at a place where customer get a 60 day warranty on their vehicle from date of purchase. All actuator working normally, normal temp at heater core so i assume the air distribution box was bad, maybe some of the door didnt close well or something. Took one day to take dash apart and another day to replace and reinstall dash. Add coolant and still had the same issue. So i cuss dodge out and why the hell do they still put that god damn battery in the left wheel well after all this year. After a few minute, i decided to flush the heater core out but i didnt want to take the whole dash apart again. I end up just disconnecting both heat hose off, grab 5 foot of 5/8 heater hose and connected one end to the top of the heater core tube. The other end to a water. Flush for a minute or two then switch it to the bottom heater core tube and flush it the other way. I notice this white particle came out of the heater core as i flush it. Reconnect the original heater back and add coolant. While bleeding the system, the temp on both vent went back to spec at about 132 degree. Test drove the vehicle and the most it fell was 10 degree to 122 degree. Fix the problem. The tip here to save you time and money, if you come across this issue, flush the heater core first through the heater core tube through engine bay. Hope this help you guys out with your heating problem and sorry for the long story.

Jacques lacombeon Sep 29, 2016

just replaced heater core dodge journey 2010 problem was hot air driver side less hot air passenger side find out by openning the heater core that almost half of it was clogged on passenger side of the core took some picture but not sure can send it on this site

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cardocIIIon Jan 27, 2014

The Journeys have had some issues with getting plugged up in such a way that only a part of the core retains coolant flow, try backflushing it and if heat isn't restored someone will be pulling the dash to replace it.

dunes09on Jan 27, 2014

I was afraid of that. Should I just use some water to flush or is there a need to use a chemical also?

asksteevieson Jan 28, 2014

Take 2 hoses off and blow back through the heater core with compressed air.. Now here the part these tech don't know Install the hoses back on backwards and the System will back flush itself , I just did it today On a ranger and the heat is mints..just keep the hoses on heater core backwards.. That's the 1 thing these car building idiots Didn't ruin yet , the heater core can be ran backwards there's no sensors or direction of flow...be careful in pulling those hoses off ,twist really easy or slit with a razor and twist , the heater core pipes are delicates...

dunes09on Jan 28, 2014

That is a good idea, but am I right in thinking that you want to get most of the crud out of the heater core before doing this?

asksteevieson Jan 28, 2014

Yes , that's why u first blow it out with air but if u can't Get it out screw it , u wanna freeze or do an 8 hr job , go ahead..lol, sorry

Ggkgaon Apr 3, 2015

After 6 weeks off and on at dealership to repair, we took to a trusted mechanic for his opinion He said replace heater core. Took it back to dealer (thankful for stupid lifetime warranty) Even cold natured me is getting too hot now. Either it never worked correctly or this on is much better.

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