Re: Heater Woes

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

The driver's side of the core goes to the connection closest to the radiator. So, the water pump pushes liquid thru the intake into the heater hose, through the heater core, then the fluid returns to the water pump through the other heater hose. This does sound like what you have. (I don't know why the other picture I linked had it the other way.) 

Are you sure the heater water valve and temperature sensor are functional? Check this article.
http://www.1962to1965mopar.ornocar.org/ml-62-65heaters.html

Thanks,
Gary H. 


>  -------Original Message-------
 
>  
>  I'm pretty sure the FSM showed the water pump port going to the pass
>  side but I'll revisit it...I've been wrong before!
>  
>  
>  I'm pretty certain the internal door is moving, but even if it
>  wasn't...if I set the temp to hot, I should still get hot
>  air....correct?
>  
>  
>  Bill M 
>  
>  On Mon, Dec 29, 2014 at 9:04 AM, Gary H.   wrote:
>  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:
>  [LINK:
>  http://articles.mopar1973man.com/2nd-generation-24v-dodge-cummins/27-hvac-heating-ventalation-and-air-conditioning/86-heater-performance-diagnostics]
>  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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