Heater Core Next Week - Any tips?
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Senior User
Joined: Apr 2003
Posts: 426
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From: Knoxville, TN
Heater Core Next Week - Any tips?
I'm going to replace the heater core in my 72 non-ac truck early next week?
Any tips?
Got new heater hoses and a heater core on the way.
(Search didn't turn up much.)
Any tips?
Got new heater hoses and a heater core on the way.
(Search didn't turn up much.)
Postmaster
Joined: Apr 2002
Posts: 3,613
Likes: 6
From: Coal country
It is pretty simple, since you have the non-ac box. Three nuts on the firewall under the hood, take off the hoses and the cables under the dash, and it comes right out.
Be careful of the defrost hoses; they can be fragile.
Also, don't throw that heater box around too much. It is fiberglass, so it cracks and breaks quite easily.
Disassembly is pretty straight forward.
2 hours at most to do it.
Be careful of the defrost hoses; they can be fragile.
Also, don't throw that heater box around too much. It is fiberglass, so it cracks and breaks quite easily.
Disassembly is pretty straight forward.
2 hours at most to do it.
Post Fiend
Joined: Jun 2003
Posts: 8,209
Likes: 12
From: Black Hills of SD
I always test the new heater core under water buy putting air pressure to one pipe while holding my thumb over the other. Over the years I have had maybe 10 new ones that leaked. It is no fun redoing a heater core that was a 7 hour job to start with. Yours should only take an hour.
Elder User
Joined: May 2003
Posts: 520
Likes: 1
From: california
When I change out hoses, after loosening the clamps, I'll take a utility knife and slice the hose lengthwise (as opposed to cutting it accross) at the connections. It makes it a whole lot easier to remove the old hoses from the fittings. Otherwise you'll risk the chance of damaging the brass connections or sweat joints. I guess it doesn't matter if you're replacing the heater core. Since you're changing out the hoses, you may want to check the fittings at the heater control valve for rot.
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