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Old 01-13-2007, 08:51 AM   #1
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heater blows cold at idle

Hey there, that is pretty much the symptoms, if I go and warm up the car in the morning, it doesn't matter the engine temperature, it can be completely at operating temp and it still blows cold, until I bring up the rpms to about 1500 or just start driving. When I am driving it is fine and blows warm, but when I stop at lights it blows cold again
Let me know what you think
thanks
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Old 01-13-2007, 10:21 AM   #2
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prestone flush. prob clogged as hell and no coolant is getting through until the higher rpms push it through. better do it now before it becomes a blockage and a flush is no longer an option.
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Old 01-13-2007, 10:43 AM   #3
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1) start by verifying that the heater core valve is opening. if it opens then

2) purge any air from the system...
http://forums.maxima.org/showpost.ph...2&postcount=14

3) if that doesn't work you probably have a clogged heater core and a "standard" chemical flush (just pouring stuff into the radiator) probably will not fix it...
http://forums.maxima.org/showpost.ph...6&postcount=44

before you tear out the heater core though, your could try to open the heater core lines and attempt to directly force flush it with a high concentration of the flushing chemicals. it might work, but I think your chances are low.

whatever you do, follow this advice (esp coolant type and purging air) ...
http://forums.maxima.org/showpost.ph...4&postcount=45
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Old 01-13-2007, 10:43 AM
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