Where is the heater core on a GMC Envoy?

The heater core on a GMC Envoy is located behind the instrument panel and dashboard. A failed core can lead to windows fogging up or coolant leaking from under the dashboard onto the passenger side floor board.

How do you remove heater core from HVAC housing?

Separate the HVAC module from the instrument panel carrier. Remove the screws and separate the cover from the HVAC housing. Remove the screw and clamp that retain the heater core. Remove the heater core. Reinstall the new heater core into the HVAC housing.

How to remove a radiator from a HVAC unit?

Remove the heater core. Reinstall the new heater core into the HVAC housing. Make sure the original insulation/sealing materials are in place around the heater core pipes and core. Reinstall the remaining components in the reverse order of removal. Reconnect the lower radiator hoses to the radiator and install the clamp.

How to reinstall a new HVAC heater?

Reinstall the new heater core into the HVAC housing. Make sure the original insulation/sealing materials are in place around the heater core pipes and core. Reinstall the remaining components in the reverse order of removal. Reconnect the lower radiator hoses to the radiator and install the clamp.

Is the GMC Envoy 4 wheel drive dysfunctional?

My 2005 GMC Envoy SLT, 4.2L inline 6 cyl. (10 years old at the time of this writing) had dysfunctional 4 wheel drive. I purchased the car in this condition, and so did not know all the history. There were no symptoms such as grinding, whirring, chatter etc, other than it did not work.

How to remove front disconnect assembly, 2005 Envoy?

Disconnect the electric plug from the disconnect assy. Remove the actuator. Remove 4 bolts holding assy to oil pan. Pry assy from oil pan. This may take some effort, and may be impossible to do so. It should pop off. If the assy doesn’t budge, you have a corroded fused assy.

How to remove CV axle from 2005 Envoy?

Separate lower ball joint from lower control arm. Pull wheel hub steering knuckle assembly from front axle. Set aside on blocks under wheel well with brake line still attached. Remove right front CV axle using a brass drift and 2 lb mason hammer against tripot housing.

How do you drain coolant from a radiator?

Drain the coolant from the radiator by placing a container below the radiator drain and loosening the hose clamp on the lower radiator hose. Slide the hose back until the coolant begins to drain and then remove the radiator cap. Remove the heater hoses and air conditioning evaporator lines from the fittings at the firewall.