[DML] Re: Cleaning off heater core to improve airflow
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[DML] Re: Cleaning off heater core to improve airflow



Taking it apart would be the last thing I would do. The AC evaporator 
is before the heater core so any obstructions are probably there. If 
you remove the blower motor you can access it with a vacuum.

That could be some of your problem but, if you haven't checked, and I 
assume you feel the lack of air is on ALL speeds, I would suspect the 
blower motor is dragging or the blower cage fins are full of dirt.

When you take the blower motor out you can use a spray gun (like the 
type on bug-spray gallons) with water to flush the evaporator too.

These are things I have done to restore my air flow.

Over the years, on this car, I have lost air flow when the fuse 
holder for speeds 1 and 2 (that also runs the AC clutch, etc.) 
burned. All speeds slowed when the connection to the blower motor 
became weak (and burned). I have replaced the blower motor two times -
 the old ones just started dragging because the bearing surfaces on 
the motors became shot.

Harold McElraft - 3354


--- In dmcnews@xxxxxxxxxxxxxxx, "ksgrimsr" <knut.s.grimsrud@...> 
wrote:
>
> Hi guys,
> 
> I'm getting pretty low airflow through my heater/AC system and 
suspect 
> that I have an accumulation of lint on the heater core restricting 
> airflow (which would be reasonable for my 190K mile car).
> 
> I reviewed the workshop manual that outlines how to remove the core 
> (including discharging the AC system, emptying coolant, etc). I 
don't 
> really need to remove/replace the system, I just need to expose it 
> sufficiently to allow me to vacuum it off well.
> 
> Does anyone have first-hand experience with this that can provide 
> recommendations for how to best clean off the core (hopefully 
without 
> wholesale removal of everything)?
> 
>     Knut
>




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