Quote:
Originally Posted by dakota1205
I'v had the same issues on my 00 silverado z71. I back flushed my heater core and gunk come out of it. I'v had to do it once a year about this time. I still use the dexcool and just use regular tap water. Could regular tap water make the dexcool gunk up over time? Once I backflush, it works great though.
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the Dexcool issues are most times from using dirty contaminated water.. tap water has chemicals that react to Dexcool in a bad way. I have used Dexcool for now over 20 yrs. still have a 96 impala and funny how when the car was new I had heater problems but not now since I use distilled water with 60%dexcool.. 2000 silverado same thing 16yrs now and the coolant system still working great good heater heat about 130 DEG F out the vents. 20deg F air temp... flushing is done at each coolant change and I also blow it out ..