Heater Core Question
Cargo Master
Joined: Oct 2005
Posts: 2,295
Likes: 25
From: NJ
Not sure but high output likely has more rows in it. Many of the aftermarket replacement heater cores for all vehicles are real cheesy and are much thinner with fewer rows and less fin area. If you live where it gets real cold in winter or the price difference is small, go with the high output.
Post Fiend
Joined: Dec 2007
Posts: 8,521
Likes: 16
From: Lost
High output heater uses a larger size core. The HO core won't fit into a standard heater box.
Most HO heaters are in non-A/C trucks. Lets face it, if you need the high output heater, then you most likely don't need A/C.....
Most HO heaters are in non-A/C trucks. Lets face it, if you need the high output heater, then you most likely don't need A/C.....
Cargo Master
Joined: Mar 2007
Posts: 2,935
Likes: 34
From: Arcadia, Fla
Also when using a aftermarket heater core, they sometimes are a very tight fit. Had my 89 F250 blow a heater core last year, so I robbed Blue Mule's core(84 F250) and they were the same, two weeks later, that one leaked!! Got a aftermarket and had one heck of a time getting it back in the box 
(even tried it on the 84 truck with same results)
Just don't mung up the pipes while going through the firewall, a 2nd person with two wooden dowl rods to guide them through the firewall WILL HELP alot!
(even tried it on the 84 truck with same results) Just don't mung up the pipes while going through the firewall, a 2nd person with two wooden dowl rods to guide them through the firewall WILL HELP alot!
Hotshot
Joined: Feb 2004
Posts: 11,697
Likes: 3
From: Marengo, Iowa
Typically the high output actually has those words cast into the housing, and as stated, is typically a non-factory air truck. You will find them with dealer air though. For simplicity of replacement, hope for a standard output, the high outputs are a bugger to change, you have to remove the air box, as they are in the engine compartment. The hoses hook up at the air box, not the firewall.
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Cargo Master
Joined: Mar 2007
Posts: 2,935
Likes: 34
From: Arcadia, Fla
I done that before, but when a leak formed inside the core area I couldn't get to,it was game over for it. Too bad all the aftermarket ones are aluminun, still can't "solder" that stuff. I did try that aluminum "solder" with no success.
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Semper Fi
Joined: Feb 2011
Posts: 771
Likes: 1
does any one know the dimensions of each? Mine is 7 3/4 x 7 1/4 x 2
based on some online searching I think that closely matches the hi output model. Mine was super easy to change as the pipes went thru to the engine bay...I have factory installed air. dont see any markings on the cover.
based on some online searching I think that closely matches the hi output model. Mine was super easy to change as the pipes went thru to the engine bay...I have factory installed air. dont see any markings on the cover.
Moderator
Joined: Nov 2007
Posts: 22,415
Likes: 92
From: Denver Metro Area, CO
I looked up some stuff on Rock Auto's Web site... I didn't see the year & model of your truck anywhere
in the first post so I chose 1984 *****-nilly (I imagine they're all the same).
The More Info link for the first one in the list is (for a standard output heater WITH AC) says:
Can't find any measurements for the Hi-Output variant but I'd imagine there's more than
half an inch difference....
in the first post so I chose 1984 *****-nilly (I imagine they're all the same).
The More Info link for the first one in the list is (for a standard output heater WITH AC) says:
<table class="bdydesc" border="0" cellspacing="5"><tbody><tr><td>Aluminum</td></tr> </tbody></table> <table class="bdytext" border="0" cellspacing="5"> </table> <table style="width: 100%" class="infotext" border="0" cellspacing="5"> </table><table class="moreinfotable"><tbody><tr><td>Core Width: 7.25"</td></tr><tr><td>Core Height: 7 1/8"</td></tr><tr><td>Core Depth: 2"</td></tr><tr><td>Inlet Connection: 5/8"</td></tr><tr><td>Outlet Connection: 5/8"</td></tr></tbody></table>
half an inch difference....
Hotshot
Joined: Feb 2004
Posts: 11,697
Likes: 3
From: Marengo, Iowa
?? Yours has the dims that are closer to the standard output... I took those dims from the Autozone website. No pic, and most of the ones I find pictured are the regular output, don't know why they don't get the right pics on there...If yours was easy to change, it was standard output, as the true high output heaters are a pretty involved job. Old man's 84 has one...
