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It's the bypass hose. It's a short hose that runs from the intake manifold to the water pump and is hidden under the bracket that supports the alternator and a/c compressor. Remove the alternator, unbolt and move the a/c compressor to the side, then remove the bracket to gain access to this hose.
you have to remove the alternator and the water hose on the top.when this is done youll see two sensors the one to the left is tempertue sending and the one to right is the coolant temparture sensor a little harder get out, but be patient with it.coolant temperture has two wires and temperture sending has one. for the amount work i would change both sensors the hose and the thermostat. take the themostat cover off and leave thermostat in place until you change sensors in case you drop something it wont fall into the hole.this should make it easier to get at the sensor to the right. thermostat should be a 195.sensors look alike but are different
Follow the upper hose to the top of the engine behind the alternator/a/c compressor. The t stat is under the outlet pipe the hose is attached to. Sometimes it is easier to remove the alternator, ac compressor and the bracket so you can get at the bolts and clean up the surfaces.
The thermostat on this vehicle's In-line 6
cylinder engine is on the driver's side of the engine, below &
behind the alternator. You have to remove the alternator to gain access to the thermostat housing. You also need to disconnect the battery before you remove the alternator to avoid sparks and shorts.
directions outline removal of the alternator to gain easy access to the
hose clamps, bolts and housing of the thermostat. I have located a
site that after free registration, has detailed instructions on how to
do this job, and the link below that describes an easier method with
photos. Check out:
Before servicing the vehicle, refer to the precautions at the beginning of this section.
Remove or disconnect the following:
Negative battery cable
Coolant until level is below thermostat
Support bracket located near rear of alternator (A/C Vehicles)
Alternator drive belt by attaching a wrench to the pulley mounting bolt of the automatic tensioner, rotating the tensioner clockwise to release belt tension, and removing the belt:
Alternator mounting bolts, but do not remove any wiring at alternator
4WD indicator lamp wiring harness (4WD vehicles)
Alternator and position aside
WARNING When servicing constant tension hose clamps, use only tools designed for servicing this type of clamp, such as special clamp tool (number 6094). Always wear safety glasses when servicing constant tension clamps. Always replace constant tension clamps with the same numbered clamp.
Radiator hose clamp and upper radiator hose at thermostat housing and position wiring harness aside to gain access to thermostat
Thermostat housing mounting bolts, thermostat housing, gasket and thermostat
Clean intake manifold and thermostat housing mating surfaces.
Install or connect the following:
Thermostat (spring side down) into recessed machined groove on intake manifold
Gasket on intake manifold and over thermostat
Thermostat housing to intake manifold
NOTE: The word FRONT is stamped on housing and must be placed towards front of vehicle.
Housing-to-intake manifold bolts.
Torque to: 200 inch lbs. (23 Nm)
Upper radiator hose to thermostat housing
Alternator (A/C Vehicles)
Torque to: 30 ft. lbs. (41 Nm)
Torque to: 40 ft. lbs. (54 Nm)
Drive belt over all pulleys except idler pulley
Socket/wrench to pulley mounting bolt of automatic tensioner and rotate clockwise
Belt over idler pulley, let tensioner rotate back into place and remove wrench
P0404 IS EGR POSITION SENSOR PERFORMANCE..YOU NEED A NEW EGR VALVE..RECOMMEND DISCONNECTING BATTERY WHILE REPLACING EGR VALVE..SOMETIMES CODE WILL NOT GO AWAY EVEN AFTER REPLACING VALVE AND CLEARING CODE WITH SCANNER..VALVE IS LOCATED ABOVE ALTERNATOR ON END OF CYLINDER HEAD..THE BOTTOM BOLT CAN BE TRICKY TO REMOVE AND HAVE HAD TO REMOVE ALTERNATOR TO GET BOLT OUT..YOU WILL NEED A NEW GASKET FOR TUBE AS WELL..ABOUT 120 BUCKS FROM DEALER(CAN)
The thermostat on this vehicle's (the Envoy & Trailblazer are essentially the same vehicle) In-line 6 cylinder engine is on the driver's side of the engine, below & behind the alternator. It is not found in the typical location (which may be for the 8 cylinder engine), in an answer above.
Most directions outline removal of the alternator to gain easy access to the hose clamps, bolts and housing of the thermostat. I have located a site that after free registration, has detailed instructions on how to do this job, and the link below that describes an easier method with photos. Check out: