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Old 01-10-2012, 08:41 AM
Location: Petticoat Junction
930 posts, read 1,390,603 times
Reputation: 1476


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
11,368 posts, read 37,485,492 times
Reputation: 8293
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
8,406 posts, read 17,237,488 times
Reputation: 6714
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
11,368 posts, read 37,485,492 times
Reputation: 8293
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
9,072 posts, read 15,795,772 times
Reputation: 5572
Maybe its just a bad thermostat or clogged heater core.
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Old 11-21-2014, 01:55 PM
1 posts, read 1,239 times
Reputation: 10
Default Heater not blowing hot air

My heater in my car is blowing not so hot air. I believe that I need to replace the heater core. Does anyone know how much it should really cost to have this replaced. I know that it is not an easy job. You have to pull the entire dash out before getting to the heater core.
My vehicle is a Ford Expedition 1998 . Thank you.[/quote]
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Old 11-21-2014, 02:33 PM
Location: Minneapolis
1,613 posts, read 4,043,836 times
Reputation: 1192
First, check your coolant levels (in both the radiator and the expansion tank).

Only check the radiator with the engine cold (meaning it hasn't been run in several hours) because the cooling system is (or should be) under pressure when the engine is at normal operating temperature.

If they're at the correct levels (radiator to the top, expansion tank between the upper and lower lines when the engine is cold), and you're still not getting heat, then please start a new topic so your question will be on the top of the thread.

Last edited by Thegonagle; 11-21-2014 at 03:01 PM..
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Old 11-23-2014, 07:52 AM
2,600 posts, read 4,018,586 times
Reputation: 2338
Check the blend air doors first.
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