have a 2005 trailblazer need to know how to use the cruise control no manual

Should be located either on the steering wheel or on a stalk like near the turn signal if your vehicle was equipped with it. Turn it on, when you reach the desired speed hit "Set" and when you brake, it will turn off.

You can take your truck to the dealer for a demonstration (free of charge). You can also use the buttons to speed and slow the truck. 1MPH each time the buttons are pushed. If you have the steering wheel controls, Get to desired speed and maintain, Push the "ON" button and and the "SET" button, a light on your dash panel will light up "cruise". If you need to stop the cruise will pause, once you get going again simply press the "resume" button and the truck will accerate to the speed you had it set at. If you need to slow down a little press the "decel" button and the truck will slow down 1MPH each time you press it, as well if you press the "accel" button your truck will accelerate 1MPH each time you press it. If you stop and shut the truck off you will wipe out the memory and will need to reset it when you get going, If you have the "stalk" model it will be on your blinker stalk. Get the truck up to the speed you want and maintain it, press the button on the very end of the stalk, then rotate the handle (towards the dash), the truck will on maitain its speed, To slow press the button on the end and the truck will slow down 1MPH each time it is pushed, as well it will accellrate 1MPH each time you rotate the stalk. DO NOT use the cruise in winter weather, If you hit ice the truck will slow but the truck will accellrate and you will spin out. Hope this helps and enjoy the truck. Cheers.

I have a 2005 Trailblazer replace the clutch fan water pump thermostat it is still bubbling water in the reserve tank what else could be wrong