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post #1 of (permalink) Old 11-12-2003, 07:48 AM
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Regarding Heater Core

Hi Guys,

For some time now I have been trying to figure out why my heater blows air when on hot, but the air is never warm.

I tried watering down my coolant, backflushing the heater core, etc. Nothing seemed to work. Both core hoses seemed to get hot pretty much the same, so I was baffled.

However, when I took the bottom plastic cover (partially, I could not get the entire thing off) off, I was able to reach my hand in and feel the metal intake and exit lines on the core itself under the dash. This is when things became a little interesting:

The intake metal line to the core was seering hot. Good I said. However the exit line wasn't even warm. Weird.

When I felt the face of the core itself, half of it was cool (on hot line intake side! Weird), and warm on the exit side. Weird.

I would imagine that although some of that doesn't make sense to me, the core is mostly blocked. As hot as that intake line was, that entire unit should have been very, very warm, at least - I would think.

Now I have already tried back flusing the core with a garden hose, I guess it didn't do anything. Is this a candidate for replacement? If so, how difficult is that? Or is there anything else I should try, first.

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post #2 of (permalink) Old 11-12-2003, 02:04 PM
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Re: Regarding Heater Core

yeah, it sounds like the heater core is going to be your culprit. they are pretty easy to install but you have to be careful. there are a few wires and what not you have to move to get at it. all in all not a hard job. the attachedpicture is a page out of the haynes manualthat gives a step by step approach to this.
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post #3 of (permalink) Old 11-12-2003, 05:25 PM
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Re: Regarding Heater Core

my bet is the air doors if the core flows well and a plugged core otherwise
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