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Heating & Cooling 3rd Gen Dodge Ram Heating & Cooling Problems and Questions.


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  #1  
Old 04-04-2013, 10:53 AM
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Default Clogged heater core

My buddy asked me to as you guys this question about a Dodge Ram 2003 407. He has been a very successful mechanic for years but never ran across this problem nor have the local dealerships.

The problem is last year a customer had a problem with the heating cooling system. He had to replace the radiator and the heater core. Now he has to replace the heater core again. The cooling system is clean with nothing in it at all but coolant. He took the heater core apart and on one side of the core it was clogged like the coolant congealed and stopped up the vents. The truck has a dual temp control for the passenger and the driver it is the passenger side that is clogged. Drivers side has heat passenger side is cold. Now remember this isn't clogged with trash it's like the coolant congealed on that side. He is using the same coolant he has used for years and it says it is compatible with with this truck. The coolant is FCC International Global.

Has anyone had or head of the problem and if so what is the fix?

thanks for the help
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Old 04-04-2013, 10:57 AM
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Sounds to me like two incompatible coolant types were mixed, causing them to gel and this is what's clogging the cores. Chrysler is very specific about the use of HOAT coolant and NOT mixing it with any other type. The fix is a complete and thorough back flush of the entire system and if that doesn't get it all, it's time to start replacing parts like the radiator and heater core again.
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Old 04-04-2013, 11:09 AM
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Ok thanks. Yeah I know the GMC's for better or worse designate Dexcool. I think since it said compatable with all cooling systems it would be fine. Apparently not. He has never had a problem with this coolant in the past.

thanks for the help I'll let him know.

Last edited by thumbs; 04-04-2013 at 11:11 AM.
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Old 04-04-2013, 11:32 AM
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Coolant that's "compatible with all types" is a bunch of crap. I've see this happen before but not quite to the extent you've described.
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Old 04-04-2013, 12:03 PM
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I just went over and talked to him about the coolant. He said on the bottle of coolant it is approved by Chrysler or Dodge for use in their vehicles. I was wrong not compatible but approved. Anyway I gave him the info. I know what I would do. I would flush the heck out of the system and put in the Hoat and see if it makes a difference. He said he flushed it like the devil before he put the FCC in. Not sure what he is gonna do but I think I would try your way first. I think the approved thing is the problem. He has used this stuff in tons of Dodges and never had a problem. Oh well I've done what I can. LOL

thanks again
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Old 04-04-2013, 02:16 PM
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But did he back flush the cooling system? Straight flushing will just drive the gelled substance deeper into the radiator and heater cores.
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Old 04-04-2013, 04:59 PM
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He said he back flushed.
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