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motornut · 11-14-2014, 08:38 AM

Check your mixture what ratio water to antifreeze are you running.
I too use a cover in the winter,sure works well for me.

11-14-2014, 08:38 AM	#6
motornut 78K & 79C Jimmys Join Date: Nov 2009 Location: Ottawa Ont CANADA Posts: 7,901	Re: Heater blows cold air at driving speeds.... Check your mixture what ratio water to antifreeze are you running. I too use a cover in the winter,sure works well for me. __________________ John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350