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Re: No Heat on my 2001 jimmy
Check the vacuum lines under the hood to vac tank and check valve(older style sys) may have a door motor with built in position sesnor that is faulty or the rod from door motor on drivers side (to right of acc pedal and up 6in) to heat door fallen off
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The heater core may be plugged with rust. Good way to test it is with the engine warmed up put the controls in heat mode and then go under the hood and locate both water hoses going t the heater core. Hold on to both hoses to see if the temperature of both hoses are the same. If not, no water is getting into the core. . If the temp is the same, then control vacuum is not working. There is a check valve in the line to the control head that prevents vacuum fluctuations from moving the blend door when accelerating. Check it.
Check the coolant level. If its low you wont get any heat. If its full then I would suspect that the temp. selector on the climate control is faulty. Farley easy to replace. Your local you pull parts yard will have one for $20-$35.
I've had this problem. 2000 GMC uses a closed coolant system. Meaning takes and returns coolant from and to the Reserve Bottle and has little air in the engine and heater systems.
If everything appears ok but no heat. "Air Lock" is the most likely cause. (With interior heater set to full heat) Solution; 1. Make sure water pump works. 2. Drain about 1/2 engine coolant into container. 3 Remove both heater hoses from engine side and flush heater core in both directs through heater hoses with garden hose. 4. Reattach heater hoses in correct locations. 4. Refill engine with coolant. 5 Start engine and run for 2 min., use caution when topping up coolant.
6. Most 2000 GMC have twist off caps with plugs located mid way on heater hoses. with engine cold, start engine these caps may be loosened to allow trapped air to escape. Do not attempt with engine hot due to hot coolant injuries. This may take more than one attempt to remove all air from heat system. 7. Lastly most 2000 GMC water pumps have a bleeder plug,( 3/8" square driver plug) located on the water pump. With egine cold this plug should be removed to remove any air. Reinstall plug with thread sealant.
Hope this helps cheers
look in the engine bay near the fire wall behind the motor u should see 2 about 1inch dia. blach heater hoses about 3-5 inch from eachother those are ur heater core hoses one of which will have a type of box made of plastic with ither wires going into it or a vacume hose going into it on most cars this controld the flow of hot water passing threw the core as u move the heat selector from cold to hot it controls this valve perhaps this is ur problem or u have a jammed thermastat when jamed open it alows too much flow between the motor and the radd never alowing the motor to fully heat up, or ur water pump gone bad (not likely) what is your prestone mix ratio should be 60%prestone-40%water mix also make sure your rad is full a quick way to see if ur water pump is working is when the motor is cold open the radd start the car some prestone will leak out normal-- when the car gets to operating temp the lever will go down cause the thermastate will open alowing water to pass into the motor now slightly rev the motor to about 2000 rpm the level in the radd should drop every time u gass it if not might b a flow problem also if its winter in your location put cardboard infront of the radd maby one 3rd to one half of it. also check under the dash to see if the flaps in the heater /fan box move when u move the selector knobs HOPE THIS HELPD A BIT THANXX!!
what is the water temp at the dash...leave the rad cap off until normal temp... might be an air lock. If the engine overheats fast and blows coolant out the filler then its a blocked radiator...why did you repace the thermostat