CLR heater core flush..........It works! - Dodge Cummins Diesel Forum
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Old 12-23-2009, 02:24 AM   #1 (permalink)
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CLR heater core flush..........It works!

I was getting lukewarm temps at best in settings 1-3, in 4 it seemed like cool air. Heres the process I went through to problem solve my heating issues.

1. Checked to make sure the blend door was working properly. Just move the dial from cold to hot and you should see a little actuator motor spin on the passengers side of the tranny hump. If it seems to spin continuously there is a plastic piece in there that needs replacing. More info(Dodge Ram 1995, 1996, 1997, 1998, 1999, 2000, 2001, blend door auto AC heat replacement part)
2. Pull the glove box to make sure the air flap is opening closing properly. It should only close when the A/C is turned on(allowing air to circulate in the cab). Other then that it should be open in all other settings.
3. If those things check out time to flush the core.

What I did was disconnect the in/out line from the core. THen I used a piece of scrap hose to bypass the core so I could run the truck(I did this so I could park in an insulated garage while I let the CLR do its magic). I then flushed the core both ways with a garden hose. Then blew out the water using compressed air at around 50psi. Then filled up both the in/out lines with straight CLR. After an hour I flushed it again, hooked up the lines, topped it up and parked on a very steep incline with rad cap off to try to work the air out.

Ever since I've had hot air. I even get warm air before the truck is warmed up! that never happened before! Just goes to show you CLR will not eat through your heater core as others suggest. If anything I'd leave it in there longer then an hour, but thats up to you.

Anyways just thought Id share this info with you guys, its starting to get cold and as you can probably tell Im excited to have hot air back after suffering for the past 2 winters.
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Old 12-23-2009, 11:29 AM   #2 (permalink)
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I've done the same, if you want even more hot air(at least twice as much) prop the re-circ door open at leat 3/4!
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Old 12-23-2009, 11:32 AM   #3 (permalink)
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read thru this link and the link that is inside it
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Old 12-23-2009, 11:58 AM   #4 (permalink)
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Any draw backs to propping the re-circ door open?
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Old 12-23-2009, 02:48 PM   #5 (permalink)
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read thru this link and the link that is inside it

Just me or is the link missing?
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Old 12-23-2009, 03:23 PM   #6 (permalink)
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No scientist here, but I'm trying to find the missing link also.
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Old 12-23-2009, 03:39 PM   #7 (permalink)
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Propping the recirculate door open may give you problems with defrosting the windows, but you will get more heat. I wanted to try CLR in an engine, but I read the label it says not to use it on aluminum copper and brass, If it worked for you that is great.
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Old 12-23-2009, 03:55 PM   #8 (permalink)
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Propping the recirculate door open may give you problems with defrosting the windows, but you will get more heat. I wanted to try CLR in an engine, but I read the label it says not to use it on aluminum copper and brass, If it worked for you that is great.
Ya I read that too. I put some aluminum foil in a jar with it for a week and there was no change.
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Old 12-23-2009, 08:38 PM   #9 (permalink)
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opps!! I forgot to paste the link before I posted, as for window fogging I run my truck 8-10hours every day and at 3/4 open I dont have any fogging issues...BUT I had 4 people in the truck today and the drv/pass windows just started to get a little frost on them, still worth the heat increase

here is the link, again sorry...
http://www.dieseltruckresource.com/d...t=broom+handle
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Old 12-23-2009, 08:46 PM   #10 (permalink)
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Originally Posted by jpringle3@hotmail.com View Post
Propping the recirculate door open may give you problems with defrosting the windows, but you will get more heat. I wanted to try CLR in an engine, but I read the label it says not to use it on aluminum copper and brass, If it worked for you that is great.
The citric acid flush from a Mercedes dealership is one of the best things I've found to flush a whole engine. They recommend it for use in the old diesels and still works like a champ in new ones too.
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Old 12-23-2009, 08:59 PM   #11 (permalink)
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cummins has some stuff called "restore plus" I have some on the bench and have not used it yet but have heard lots of good reports, it was 25-30$ for a gallon, I was going to use it but ended up replacing a perfectly good year old not plugged up core instead, now I wished I had used the flush..
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Old 12-24-2009, 03:47 AM   #12 (permalink)
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here is a photo of my door lock wired open, a short piece of broom handle would work as well, between the body and the actuator arm



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