Ihad no heat about 4 years ago, bring the truck to the dealer,they flush the systeme,and 3 days after i had no heat again. Finally went to a rad shop,had a power flush,( i've seen that kind of mud coming out of the drain plug, the guy tool me ,that it was the problem with the dexcool stuff.) and replace it with the green coolant. Since than the heateris blowing heat. So for me dexcool wasn't that good.It didn't do the
5 years ,100k service that it was suppose to do.
Cost: dealer 85$, rad shop 65$. So it's case close for me.

 

i go to pay 35 to flush it out at my local shop i been on it for days