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Old 01-10-2012, 08:41 AM
 
Location: Petticoat Junction
931 posts, read 699,715 times
Reputation: 1431
M3 is right. On many cars, you about have to disassemble the entire dash to get at the core (says the guy who did 3 or 4 on Fox-body Mustangs....never again!) and its an all-day or multi-day job for the DIYer.....make that the LAST thing you check!
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Old 01-10-2012, 01:11 PM
 
Location: Eastern Washington
8,737 posts, read 20,561,569 times
Reputation: 4647
And the hell of it is, generally even the factory shop manual does not have a good write-up on R&R of the heater core.

A leaky heater core is pretty much the auto mechanic's version of a root canal.
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Old 01-10-2012, 03:17 PM
 
8,417 posts, read 7,415,119 times
Reputation: 6384
Quote:
Originally Posted by M3 Mitch View Post
If you are not getting heat from the heater, replacing the heater core is about the last thing I would look at, first I would check that the engine is warming up normally, make sure there is good flow on both the coolant and air sides of the heater, maybe clean it as Stealth suggests - but R&R of the heater core is not easy, go after the low-hanging fruit first IMHO.
I agree completely. Before I would pay to have the core replaced, or do it myself, I'd want a 100% guarantee that there is no other way to fix the problem whatsoever. I'd rule out everything else, based on all the good suggestion already posted, before I'd tackle that.

I'm no mechanic but can't the system be pressure tested to find a leak, if there is one? Pump it up and look for fluid?
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Old 01-10-2012, 03:55 PM
 
Location: Eastern Washington
8,737 posts, read 20,561,569 times
Reputation: 4647
OP has a heater that does not heat the air so well. This could be a clogged heater core, and I have heard of them becoming so clogged that R&R is the only way out - but man I would try to flush it out, or just grin and bear it, assuming the engine is coming up to temp properly, and any valves associated with heat control are working right.
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Old 01-10-2012, 05:23 PM
 
Location: Yucaipa, California
8,266 posts, read 9,387,887 times
Reputation: 4532
Maybe its just a bad thermostat or clogged heater core.
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