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Old 02-12-2018, 11:07 PM   #2
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Join Date: Jan 2005
Location: Unincorporated, TN
Posts: 66

2001 SC1
Default Re: Heater works great at highway speed, but blows cold when engine is idling

Sounds like an air pocket in the system. My old Dodge would do the same dang thing. You'll need to "burp" the system to get it right. Need a special funnel for it. Here's the one I bought a while back (always handy):

And a helpful video:


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