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I dont have any heat just a/c,it slowly started to fail sometimes heat sometimes not.the heater core is not plugged both heater lines are hot (in-going & out-going) I replaced the little t-stat dial control on the dash to no avail.I believe the blend air door has failed in the a/c mode either the actuator or the arm linkage what i was needing is the blown up schematic parts detail or info where the actuator actually is locted under the dash.
The manual climate control system heats or cools the vehicle interior depending on the function selector position and the temperature selected. Function selector position determines heating or cooling and air distribution. The temperature blend control setting determines air temperature.
The manual climate control components are used to:
Here is the removal and install for the blendoor actuator.
Here is a copy of the service bulletin for the heater case.
This TSB article is being republished in its entirety to include 1998 model year vehicles and correct the build date of the affected vehicles.
Absence of temperature control on some vehicles may be due to the blend door actuator shaft having an interference fit with the blend door, thus causing the blend door to break.
Replace the heater case assembly with a revised heater case assembly. Refer to the following Service Procedure for details.