That I don't know. However, have you replaced the ORANGE antifreeze in the system with the original GREEN stuff yet?
In '96 GM started using the ORANGE stuff (forgot what it's called. Dextrol?). It was guaranteed for 150k mi.
I have heard HORROR stories from several mechanics reguarding the ORANGE CRAP! It was turning to CLAY and clogging engines to the point of $$$$$$$$$$$'s in repairs!
I popped my wife's 2000 Envoy and noticed the ORANGE stuff was turning to CLAY!
This has been ruining engines for awhile now.
I took the thermostat out and removed the guts and flushed the system twice. You need to remove the guts as the gooseneck needs the outter thermostat rubber gasket on the outter ring to seal.
I then replaced the thermostat and added the GREEN stuff. No more CLAY deposits!
I suggest you do the same.
Sunday, October 22nd, 2006 AT 7:28 AM