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Discussion Starter #1
So I recently went through a whole ordeal with overheating and odd issues. That thread is "Misfire with ac on" ultimately ended up replacing head gasket, found massive blockage from radiator or head gasket sealer. So onto the heat issue.

The car runs at normal operating temp of 175-185. Along with the head gasket I replaced: Radiator, heater core, all hoses, except bypass hose (on order), water pump, thermostat (195-tested and retested) all related gaskets, there are no leaks and no loss of antifreeze, I've flushed and burped out all air from system.
Now the heat is warm, not hot. Warm enough to defrost and keep the car okayish. The temp of the hoses going in and out of the heater core are basically the same. What happens is roughly 30-40 mins into my commute the air becomes cool, but oddly the vent on passenger side towards center is much warmer.. That's what makes no sense. I looked at the vent tubing briefly when doing the core, seemed fine so I didn't inspect much. The heat/ac doors seem to be functioning properly and all vacuum lines are working as well. At a stop light the temp will go up to 198-205 and thermostat opens and it quickly goes down to 180 ish. New radiator cap (two actually, since I wasn't sure) same with ECT sensor. I did some temp checks with a laser thermometer and was all within range. I continually run forscan lite to watch temps and when the vents become cool there is no change in ect.

Long I know, sorry just wanted to give all information.

Any ideas? Thanks
 

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If you live in a cold climate then maybe you can use a piece of cardboard over the radiator to maintain heat.
Any smell coming from the heat vent; it is possible for critters to get in there. I removed a dead mouse from a friends heating system (dried and preserved).
 

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Is the heater core OK? no blockage in it? or debris blocking air flow over the core?
If you do live in a cold place, then cardboard over the rad would help. don't cover he whole rad, no more then say 80% of it. I had to do that in my EXP that year we got the polar vortex and it was like -20f out.
 

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Discussion Starter #4
I have in the past put cardboard in front of old trucks I had, my hesitation is its really not that cold, 30 at the lowest and the lack of more heat when sitting at a light and the coolant temp is in the low 200's with no change?

I'm also not in an area with mice, not that it couldn't happen but it's not really an issue of no air or restricted air but just cool air?

I'm wondering if maybe there is a way that cool air is entering a part of the ducting from the exterior? And I did do a reverse flush out of the core, even though it's new, just in case anything got into it when doing the headgasket. Seemed clear..

It's very strange . Thanks for the help, any suggestions are helpful
 

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Having heat on some vents but not others is classic for either a partially clogged heater core or failed temperature blend door.
 

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Discussion Starter #6
Well you are correct, partially blocked core. After my second backflush attempt some leftover gunk from the whole system change was coming out of the new heater core. Heat a plenty now. Thanks!
 
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