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Heater has quit blowing hot

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Old Feb 20, 2013, 11:20 AM
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Heater has quit blowing hot

What would cause this? Bad thermostat?
Old Feb 20, 2013, 11:31 AM
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Does it still seem like the cable is connected to the dial? That would probably be the most common issue on the Evo for something like this.
Old Feb 20, 2013, 11:32 AM
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Not trying to insult but have you checked your fuses? Start simple.
Old Feb 20, 2013, 11:34 AM
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Does your engine still run at normal operating temperature?
Old Feb 20, 2013, 12:02 PM
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Yes it feels connected. Fuse? The motor blows just not hot. Yes normal temp
Old Feb 20, 2013, 12:09 PM
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That's really odd that it wouldn't be blowing hot.

The only thing that would cause that would be a leak (which presumably you'd notice pretty quickly), a blockage (again... I'd suspect you'd notice this), or the cable connecting the dial at either end to have snapped, which is fairly common. When I say dial, I mean the temp dial AND the air selector dial.

It could be stuck in a weird position. But you're getting "normal" air yes? Also, your AC work?
Old Feb 20, 2013, 12:14 PM
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Yes getting normal air and no leaks
Old Feb 20, 2013, 12:28 PM
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The I would pull the front plate off your dash and verify that the cable is connected properly.

It can really only be one of those things.

I mean silly question, but you're saying the car isn't blowing hot air after it's warmed up right? Also... you're in Miami? The heat should be blowing fine down there I'd imagine.
Old Feb 20, 2013, 12:30 PM
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This thread, though dealing mostly with AC, could prove useful.

https://www.evolutionm.net/forums/ev...ega-guide.html
Old Feb 20, 2013, 12:47 PM
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Are you sure the coolant hose did not bypass the heater core? :}
Old Feb 20, 2013, 12:59 PM
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Yeah, most likely the thermostat. Anyway, a thermostat swap is an easy place to start the investigation.
Old Feb 20, 2013, 01:10 PM
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Got it fixed. Line wasnt connected to gear
Old Feb 20, 2013, 03:43 PM
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FYI. I'd be very gentle with that knob now... usually once it pops, it comes loose easier and easier.

Good work tho...
Old Feb 20, 2013, 04:14 PM
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How do you fix it? I just got a evo 8 this weekend and my ac works fine but heat doesnt even turn on.
Old Feb 20, 2013, 04:23 PM
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Ryan... welcome.

I would suggest finding the service manuals if you're not familiar with how the dash comes apart, or search for a how to (might be on here?).

Basically, you pop the CF piece out, pull the knobs off, pull the surround out, find the hidden bolts, and you can expose the cable that way.

It's very easy to do honestly if you're familiar with interior disassembly... but no one likes making a very minor mistake which (on interiors) yield significant interior flaws.
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