99 Blazer, A/C, 4x4..161k
Cooling System Background:
I had the dealer flush the dexcool about 5000 miles ago. The dealer
said there was some funky stuff in the radiator, and that I had made a
good call getting it flushed. Sometimes I hear gurgling from the heater
core. No wet passenger floor surprises so far, and the heat still works.
Driving through low-speed or no speed, city traffic, the water
temperature quickly gets into the 230-235 degree range. When I get to
highway speeds, the vehicle instantly goes back to normal operating
temperature of about 190 degrees.
In my past S10 Blazers, an 86, and a 93, when things got hot, the fan
clutch would firm up and you'd hear the familiar loud fan whooshing
My roommate has a 97 blazer. I got both vehicles up to operating
temperature... and mine beyond that to 230 degrees driving around the
block a few times. His fan has a bit more resistance than than mine
does when trying to turn the fan.
I'm fairly convinced the fan clutch is most likely the problem. What
other elements in the cooling system could cause a consistent behavior