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Heating & Cooling 2nd Gen Dodge Ram Heating & Cooling Problems and Questions.


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  #1  
Old 12-07-2010, 07:57 PM
Dtimekw Dtimekw is offline
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Default Heat problem and door blend

I have the same heat problem many of you have or do (no/low heat at idle and gets hotter as the engine RPMs go up) I've searched and read threads until I passed out....wait, that may not have been the reason Regardless, heres a question and hopefully a tidbit to help others. I located the blend door actuator (I hope I called it the right thing). I can see the shaft turn (and step with the temp switch). My question is this....It turns 90* from cold to hot. Is this correct? If so, then I can rule out the blend door not operating. I know it needs to be aligned or zeroed but I would find it hard to believe it would since it just happened. Can anyone confirm the rotation being 90* from hot to cold? Thanks!

Troy
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Old 12-07-2010, 08:22 PM
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I probably should have mentioned what I have found and am working on. It started after replacing all of the hoses. I didn't check heat for about 3 weeks after. Before doing the hoses, cab temp at the vent and at idle was ~140*. Now, it is 110* and gets to 120* with the engine revving up. I flushed/backflushed the heater core when I did the hoses and replaced the t-stat as well. As of right now, I have the truck on a pretty good incline. I ran it like this for almost an hour the help "burp" it. About every 10 minutes, I would blip the throttle to see if I can hear the air bubbles which I can. At 8 MPG, I decided to leave it overnight on the hill with the rad topped off and the cap off. I'll see what it looks like in the morning. Any other ideas?
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Old 12-07-2010, 08:56 PM
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if you have a locking radiator cap, then burping is just a matter of lifting the lever. I usually run it for a while and then burp it...once or twice is all it takes. Are both heater hoses hot in and out of the firewall?
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Old 12-08-2010, 04:49 PM
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Yes, both are hot. I am not sure what you mean by locking? Do you mean the type that releases pressure by lifting up on the tab? I have the kind that goes on with a 1/4 turn. I am going to try the CLR thing I've read about. Perhaps I have crud caked up in the core.
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Old 12-08-2010, 04:54 PM
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90 degrees movement on the blend door is right.
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Old 12-08-2010, 05:04 PM
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to check out your heater functioning correctly, you might look at this site & videos
http://www.heatertreater.net/Dodge%20Product%20Page.htm
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Old 12-08-2010, 05:43 PM
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Quote:
Originally Posted by RamTech View Post
90 degrees movement on the blend door is right.
Whew! Thanks. saved me some time
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Old 12-08-2010, 08:22 PM
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**Update** Flushed and backflushed again, this time with CLR sitting in the heater core for 5 mins. By the way, CLR does not recommend using this on copper amongst other things. Just a little heads up. I parked on a hill, burped big blue and managed to achieve 130* with fan on high and engine at idle. This was 20* better than before the flush. I did notice ambient temp has A BIG EFFECT on the temp at the vent. With the hood up I lost ~8* at the vent and noticed my temp guage go down a bit. Good to know. Luckily I am in Fl so it's not as bad as some of you. Hopefully this info helped out!
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