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  #11  
Old 01-29-2012, 07:15 PM
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Mopar1973Man Mopar1973Man is offline
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Quote:
Originally Posted by MnTom View Post
That sounds more like a blend door problem than an engine temp problem. Another possible problem is the heater core may need to be flushed. Do the heater hoses feel warm at all?
Let me correct you Tom...

A plugged heater core will have both hose felling equally hot because flow stopped or near stopped. But with a good heater core and the fan on high there should be 1 hose feeling slightly cooler than the other hose. Just like on the radiator the lower hose feels cooler than the upper hose. But when the radiator plugged up both hoses get hot.
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  #12  
Old 01-29-2012, 08:18 PM
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The reason I asked if the heater hoses were warm is to try to find out if it is an engine temperature problem or not. I know the hoses should be slightly different temperatures, but to the bare hand anything over about 120* will feel hot. It still sounds like a blend door problem. Mine won't heat up as much as when it is warmer, but I do get decent heat out of the heater.
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Old 02-03-2012, 08:05 PM
dripley dripley is offline
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Not to make lite of your problem, but I am glad I am not alone. I have a 24v Cummins that has been experiencing this problem for 3 years. I am on thermostat # 7 in those years with the same results as you. I have used 2 stants, 2 cummins(1 for 03 that i did not buy at cummins, one a 180 i did buy at cummins) 2 from NAPA and the current one i got from O'rielly's, box says made in germany but on the stat itself it says made in Isreal. Heated that one up to 215* in the truck towing once and it is trying to stay in the 180's but sometimes struggles in the 170's. I never have pulled the plug shown in the photo, but thought i had all the air out. I will give the plug a try and see what happens.
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  #14  
Old 02-06-2012, 10:26 PM
95ram 95ram is offline
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Default Problem solved

Well, the heater finally blows HOT air. I took the pickup to my brother who's a mechanic. He has a heater core flush gun that uses water and air pressure. It worked because I had to turn the heat down on the way home. Now, with the temp knob at about the 2 o'clock position is what it used to be full tilt.
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  #15  
Old 02-07-2012, 08:35 AM
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Glad that you got it fixed! Especially for the Hot Air!
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  #16  
Old 02-07-2012, 05:17 PM
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Good deal!! At least it was an inexpensive fix! Dripley, you suppose yours is the same problem?
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  #17  
Old 02-07-2012, 07:02 PM
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Dripley going to mail his thermostat out to me so I can play with it. As for my previous thermostat it would hover about 195-197*F nicely...

Now my current one wonders up and down from 183* to about 193*F. Not bad I'm hoping it settles down a bit. :sarcasm:
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  #18  
Old 02-09-2012, 12:15 AM
dripley dripley is offline
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I am getting heat out of mine although it is not great. as long as I am above 30* it stays comfy. below that I run it all the time. but it is something i have not tried. cnat seem to find the time being onthe road all the time. Hopefully at the end of this job I will have a week at home.
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  #19  
Old 02-09-2012, 05:18 PM
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Dripley, check both heater hoses with a thermometer if you can. If the heater core is functioning properly the temperature of both lines should be just about the same. If you find one a quite a bit cooler than the other one you core is not flowing enough water. If they are the same then start looking into the blend door for problems.
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  #20  
Old 02-10-2012, 06:29 PM
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Tom, I have seen that stated in several forums and maybe yall can help me understand this. If I have hot water going into a heater core and the heater is extracting heat and blowing into the cab, how can the water be the same temp going out as it is coming in? It seems to me that the water would be cooler exiting the heater core. If I had no heat in the cab I could see them being the same.
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