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Heater problem?

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Old 07-22-2018, 11:38 AM
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Join Date: Jul 2018
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Default Heater problem?

I own a 7th gen with 300,000 miles. About a year ago had a bad radiator which was replaced. But now when you turn heater on the car overheats still, but not when you have the A/C on and itís 100 degrees outside. Iíve turned the A/C on and left it running for over an hour in the summer heat and it never overheats, just when you turn on the heater, I checked radiator fan and switch they both work and operate normally. A/C fan functions too. My passenger side floor board was wet but was determined as a bad door seal by mechanic. Iíve had him test for a blown head gasket and it all read 180 on all 4 so he said it was ok. Is it a clogged heater core or???? Iím not sure where to start.
 
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