I took my Yukon in because it appeared to be running a little hot. They told me the thermostat needed to be replaced and that the entire water pump had to be replaced because the thermostat was internal/integral to the water pump. That just doesn't seem right to me. Is that correct?
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Im having a similar problem, sometimes my blower works other days it wont will when it does work no hot air comes out, blower controls change but no hot air, i replaced the thermostat and now my blowers are not working!
Some of these vehicles have a false petcock. Pop off the lower hose over a catch pan, pour a gallon of water in the plastic Dexcool Coolant bottle and put the hose back on when it stops pouring out. Fill to the max line and run the car until both radiator hoses are hot (thermostat has opened). Replenish fluid to max line and cap the bottle. If you have electric fans make sure they come on and make sure your temp. gauge stays in the middle. It'll take longer on cooler days. You might have to get in the car and gas it to about 2000 rpms. Don't cap the bottle until the thermostat opens. If it vomits, change the thermostat and again make sure the electric fans kick on or the clutch fan speeds up at about 210 degrees.
WellI don't know a whole lot about cars but my 2001 Yukon was doing this exact thing and I took it to the shop and it was the accuator under the seat! It was fairly cheap and now it's working perfect, hope this helps..... oh it was $90.