Coolant Bypass Valve Replacing on Envoy,Rainier,Trailblazer?

The Procedure is Exactly Similar for Chevy TrailBlazer, GM Envoy & Buick Rainier car models.

Coolant Bypass Valve Replacing procedure with details and diagram is mentioned below:----

1. Disconnect the negative battery cable.
2. Drain the engine coolant.
3. Remove the coolant recovery reservoir.
4. Using the J-43181, disconnect the inlet heater hose from the heater core as follows:
   1. Install the J-43181 to the quick connect on the outlet heater core hose (2).
   2. Close the tool around the inlet heater core hose.
   3. Firmly pull the tool into the quick connect end of the heater hose.
   4. Firmly grasp the heater hose. Pull the heater hose forward in order to disengage the hose from the heater core.
5. Position the hose clamp at the engine outlet using J-38185.
6. Remove the heater inlet hose (4) from the engine block.
7. Remove the nut retaining the coolant bypass valve to the cowl.
8. Remove the vacuum hose from the coolant bypass valve.
9. Remove the coolant bypass valve.
10. Position the clamps at the coolant bypass valve.
11. Remove the heater inlet hoses form the coolant bypass valve. 
    
    
    
    Fig. Exploded view of coolant bypass valve (6) and related components

To install:

1. Apply coolant to the end of the heater inlet hoses. When installing a new heater inlet hose, place the clamps on the hose before installing the hose to the inlet hose fitting at the engine block.
2. Install the heater inlet hose to the inlet hose fitting at the engine block.
3. Install the coolant bypass valve (6).
4. Install the nut retaining the coolant bypass valve to the cowl and tighten to 89 inch lbs. (10 Nm).
5. Install the vacuum hose to the coolant bypass valve.
6. Install the inlet heater hose to the engine block.
7. Position the inlet heater hose clamp at the engine block using J-38185.
8. Connect the heater inlet hose to the heater core. Firmly push the quick connect onto the heater core pipe until you hear an audible click.
9. Install the coolant recovery reservoir.
10. Fill the engine cooling system.
11. Connect the negative battery cable.

These details will help.

Thanks.

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Car repair guide?

http://technoanswers.blogspot.in/2012/03/car-repair-guide.html