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03 evo heat not working well

Old Feb 21, 2009 | 04:12 PM
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03 evo heat not working well

My temp selector does not go all the way to hot and the heat is warm not hot?

Any ideas?
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Old Feb 21, 2009 | 04:15 PM
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If the temp selector does not go all the way to hot then that would be the reason why the heat is warm not hot. You may have to take it apart to see it there is something blocking the temp selector or it may be a cable issue.
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Old Feb 21, 2009 | 04:17 PM
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I had a ripped coolant hose that ran just under the throttle body. It had probably been slowly leaking for some time before it finally blew open. The first thing I noticed was that my heater was cold.
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Old Feb 21, 2009 | 05:31 PM
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TSB-04-55-003

Search next time.
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Old Feb 22, 2009 | 10:29 AM
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Also you will want to add in the cabin air filter to help prevent this next time. Mine stuck too.

Last edited by Nasty Evolution; Feb 22, 2009 at 10:41 AM.
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Old Feb 22, 2009 | 11:50 PM
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i did search and I did take the controls off and it moves all the way over now but heat still sucks.
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Old Feb 22, 2009 | 11:51 PM
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coolant is full and I have pressure tested it as well.
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Old Feb 23, 2009 | 02:03 AM
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If the coolant in your overflow tank ran below the pickup hose it may have sucked air and you might have an air pocket in the system. Does the motor temp ever get hotter than normal?
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Old Feb 23, 2009 | 08:37 PM
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thermostat?
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Old Feb 24, 2009 | 12:18 AM
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Motor temp stays rock solid. I am thinking it is not the t-stat since it holds real steady.

It could be an air bubble but I have drove 400 miles and still nothing?
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Old Feb 24, 2009 | 01:17 AM
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I have the same problem, I noticed this after my fmic upgrade. She never really warms up like before, always on the light warm side not hot.
Did you just change the fmic?
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Old Feb 24, 2009 | 03:21 AM
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Well, if you never figure it out I would try "burping" the system. Real simple. With the engine cold start it up with the rad cap off. Turn the heat on. Let it run until it warms up almost normal. .. til the thermostat opens. Then make sure that the system is full and that the overflow tank is at the normal mark. Keep squeezing the lower rad. hose and this will work out the air bubbles. This may not be the "by the book" way, but it has worked for me on my wrx and evo.
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Old Feb 26, 2009 | 05:49 AM
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controls?

Originally Posted by xspsi4
i did search and I did take the controls off and it moves all the way over now but heat still sucks.
Here's a link to the TSB, it's more than just removing the "controls".

http://www.fileden.com/files/2007/2/...tsb0455003.zip

Last edited by cfdfireman1; Feb 27, 2009 at 09:25 AM.
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Old Mar 4, 2009 | 09:32 PM
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im glad i found this thread. mine has been doing this. it used to work, it was just kinda hard to get all the way to hot. then it stopped going over to hot, now it only goes half way. when i put my gauges in, i tried looking for a problem but didnt know what i was looking at because i work at dodge and all data didnt help any.
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Old Mar 4, 2009 | 10:23 PM
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Originally Posted by cfdfireman1
Here's a link to the TSB, it's more than just removing the "controls".

http://www.fileden.com/files/2007/2/...tsb0455003.zip
Thanks I will be doing this when I pull my dash shortly.
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