RE: Heater Woes

["Gary H." <62to65mopar@xxxxxxxxxxx>]

Incorrect direction of water flow may trap air in the heater core. Even if the hoses are reversed you should get heat, just less.

If I recall correctly, the driver's side of the core goes to the connection closest to the radiator. (I would assume the water inlet would be the side with the control valve.)

If both hoses are hot to the point that you can't hold on to one comfortably, it makes me assume there is maybe a vent door not working or an obstruction. If you have one of those heat measurement "guns" check to see if both heater hoses are about the same temperature. If they are, then it sounds like an airflow issue.

Here is a general article with troubleshooting: 
http://articles.mopar1973man.com/2nd-generation-24v-dodge-cummins/27-hvac-heating-ventalation-and-air-conditioning/86-heater-performance-diagnostics 

Thanks,
Gary H. 

>  -------Original Message-------
>  From: Bill M  
>  
>  That's definitely backwards from how I have it plumbed up. I
>  could've sworn though that I remember somebody saying its bad to have
>  the output of the water pump going to the heater control valve as the
>  pressure will fatigue the valve. Don't know if that's right or
>  wrong
>   

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