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2003 Evo 28k Miles - Heat not working

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Old Oct 14, 2009, 08:59 AM
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2003 Evo 28k Miles - Heat not working

Hey guys, I posted this question a few months back because I have been way to busy to follow up with the issue.

I have a 2003 Evo 8 with 28k miles and for some reason my heat does not work. I sometimes get luke warm heat but its pretty **** poor. Someone on the forums here said I had a bad heater core? Sometimes when I get back from driving a notice a small puddle of water in the morning on the left driver side of my car but its not directly undernear the car. Should I be really worried about this issue?

Thanks!
Old Oct 14, 2009, 09:10 AM
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How is your coolant level?

My guess is the heater core itself is leaking. Taste the water on the ground; is it sweet? if so, its probably coolant.
Old Oct 14, 2009, 09:38 AM
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Man, the evo that i'm looking at has the same issues. For some reason there is resistance when I try to turn it to the heat end as well. It's getting colder over here and GA and I don't want to freeze my **** off.

Having my mechanic look at it. I'll report back if he finds out what it is.

^LMAO at comment above

Last edited by Sixth_Vang; Oct 14, 2009 at 09:44 AM.
Old Oct 14, 2009, 09:41 AM
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Even if the heater core is leaking, it should still heat your car. Probably your thermostat is stuck open
Old Oct 14, 2009, 09:47 AM
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Originally Posted by Sixth_Vang
Man, the evo that i'm looking at has the same issues. For some reason there is resistance when I try to turn it to the heat end as well. It's getting colder over here and GA and I don't want to freeze my **** off.

Having my mechanic look at it. I'll report back if he finds out what it is.

^LMAO at comment above
I also have an 03 evo and there is great resistance when i try to turn the knob to heat. There appears to be a technical service bulletin that Mitsu put out about the 03 model years having a weak gear linkage for the cold/hot knobs.
Old Oct 14, 2009, 09:51 AM
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tsb for knobs

https://www.evolutionm.net/forums/mi...hard-turn.html
Old Oct 14, 2009, 02:20 PM
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The heating knobs are a little difficult to turn but not that much. I don't think my heater core is leaking because I checked later today to see if I had any leaks and there were none. The coolant level is normal, but I have no idea what else it could be?!

Should go ahead and order a new core for 180 bucks? Or should I shovel out labor costs to properly diagnose the problem. Ahhh!
Old Oct 14, 2009, 02:51 PM
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Flush the coolant system out. Mainly the lines in and out of the heater core. You probably have an obstruction. Good luck.

Aaron
Old Oct 14, 2009, 03:04 PM
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Could it be a bad thermostat?
Old Oct 14, 2009, 03:08 PM
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bad thermostat!!!
Old Oct 14, 2009, 04:30 PM
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flush and change the coolant, and thermostat
Old Oct 14, 2009, 04:36 PM
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Originally Posted by Sixth_Vang
For some reason there is resistance when I try to turn it to the heat end as well.
https://www.evolutionm.net/forums/ev...n-problem.html
Old Oct 15, 2009, 01:15 AM
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is your motor reaching its normal operating temp? if so its not the thermostat. a thermostat stuck open wont allow your car to reach its normal temp, it'll always stay cool
Old Oct 15, 2009, 02:29 AM
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Start with the easy stuff that doesn't cost a lot of $$. Flush the system and see if that helps. If that don't work you could pull the t-stat out and test it or you could just pay the $$ for one. I haven't looked for an evo but I know they aren't that expensive.
Old Oct 15, 2009, 09:25 AM
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Log the car and see what kind of coolant temps you see. You should get about 188°F when the car is fully heated up. If it's constantly less than that, get a new thermostat. If it's right there or higher, get a coolant flush done. It's cheap and might unclog whatever might be blocking your heater core. Also, feel both of the lines going into the core (engine compartment, they plug in through the firewall) and see if both feel hot.


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