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General Category => Tech - Help Area => Body-Interior-Electrical => Topic started by: A_DAB_will_do on January 15, 2011, 05:16:23 PM

Title: Blown heater core
Post by: A_DAB_will_do on January 15, 2011, 05:16:23 PM
Found a drip of radiator coolant down in the passenger side footwell, near the door.  I'm guessing it's the heater core that's croaked?  Or are hose leaks more common in these trucks?  Can anybody tell me if it's a big deal to change out a heater core in these trucks?  Can anyone point me to an online posting by someone who's done one before?

Sigh.  One more thing to fix...
Title: Re: Blown heater core
Post by: someotherguy on January 15, 2011, 07:28:38 PM
Not a terrible job; sometimes it goes easy and sometimes it's a pain.  Depends on what day of the week it is, or phase of the moon, something. :D

That's the only area that coolant enters the cabin, at the heater core.  Be extra sure the hose connections to it aren't loose or otherwise leaking, though usually that will drip down outside the firewall onto the ground, not through it into the cabin.

Circled in yellow are the six screws that hold the lower cover onto the heater/AC box.  In this pic the core has already been removed.
(http://www.someotherplace.com/info/heatcore03.jpg)

(Here's the shot prior to removal):
(http://www.someotherplace.com/info/heatcore02.jpg)

The rearmost one and the one under the evaporator core are a little tricky to get to; a long 1/4" extension or doubled-up ones will make it though.  Then be very careful removing the cover as it has a lip on it that locates it to the box; forcing it can crack the cover (or worse, the box itself.)

Once the cover is down, there's just one more screw on a retaining tab that holds the core, easy to get to.  Do note that some new cores come with a new tab as the tank design may be slightly different.

Richard
Title: Re: Blown heater core
Post by: A_DAB_will_do on January 16, 2011, 08:26:29 AM
Thanks Richard, I appreciate the time you took to post photos.  Your shots confirm for me that the replacement part I found on RockAuto is the right one as well.

Something else to add to the list of things to do...although this one gets boosted to near the top of the list with it being winter...