My air and heat controls do not work (no power)

Item Part Number Description 1 18A318 Vacuum Control Motor-, Panel/Defrost Door 2 18A478 Panel/Defrost Door (Full Vacuum Position) 3 - Defrost Air Flow 4 - Side Window Demister Air Flow 5 18B545 Temperature Blend Door (Full Heat Position) 6 19860 A/C Evaporator Core 7 19A813 Air Inlet Duct Door (Full Vacuum Position) 8 - Outside Air Inlet 9 18A318 Vacuum Control Motor-, Air Inlet Duct Door 10 - Recirculated Air Inlet 11 18527 Blower Motor 12 19A566 A/C Vacuum Reservoir Tank and Bracket 13 - Vacuum from the Engine Intake Manifold 14 19B888 A/C-Heater Function Selector Switch 15 - Vacuum to the 4x4 Hub Solenoids 16 18495 Water Diverter Valve (Full Vacuum Position) 17 18476 Heater Core 18 18A559 Floor/Panel Door (Full Vacuum Position) 19 - Floor Air Flow 20 18A318 Vacuum Control Motor-, Floor/Panel Door 21 - Panel Vent Air Flow

You should check your fuses inside and also the fuses under the hood if that's not it then its a wiring problem in the dash somewhere.

replace the panel control or heat control valve

Always check body grounds. You may have good power to the engine with a good ground still, but your body grounds control power to all else.

sounds like you need another machanic

There are two fuse boxes. A baqttery junction box under the hood on the drivers side and one inside on drivers side. Good luck.

Fuse/Relay

Location

Fuse Amp

Rating

Power Distribution Box

Description

1 60A** I/P Fuse Panel

2 40A** Blower Motor Relay

3 50A** 4 Wheel Anti-Lock Brake System

(4WABS) Module

4 30A** Power Windows, Power Moon

Roof, Power Seat

5 50A** Ignition Switch, Starter Relay

6 20A** Transfer Case Relay

7 - Not Used

8 20A** Air Suspension

9 40A** Air Suspension

10 30A** PCM Power Relay

1 10A* A/C Relay

2 30A* Heated Seats

3 30A* Heated Backlight

4 15A* Fog Lamps and Daytime Running

Lamps

5 4 3 2 1

10 9 8 7 6

12 11 10 9

8 7 6 5

4 3 2 1

15 14 13

2 1 1

9

6

10

8

7

5

4

1

3 2

175

MEGAFUSE

Roadside emergencies

197

Fuse/Relay

Location

Fuse Amp

Rating

Power Distribution Box

Description

5 - Not Used

6 10A* Powertrain Control Module

7 30A* 4 Wheel Anti-Lock System

(4WABS) Module

8 15A* Rear Wiper Motor

9 20A* Fuel Pump Relay and RAP

Module

10 15A* Horn Relay

11 15A* Parklamps Relay and Mainlight

Switch

12 30A* Mainlight Switch and

Multifunction Switch

13 15A* Heated Oxygen Sensor, EGR

Vacuum Regulator, EVR Solenoid,

Camshaft Position (CMP) Sensor,

Canister Vent Solenoid

14 30A* Generator/Voltage Regulator

15 - Not Used

1 - Wiper Park Relay

2 - A/C Relay

3 - Wiper High/Low Relay

4 - PCM Power Relay

5 - Fuel Pump Relay

6 - Starter Relay

7 - Horn Relay

8 - Rear Wipe Down Relay

9 - Blower Motor Relay

10 - Rear Wipe Up Relay

1 - Not Used

1 - DRL Diode
2 - Electronic Engine Controls Diode

2 possibilities. 1 - the heater system isnt getting adequate hot water flow from the engine and not heating the air for your heater to function. This can be due to a defective heater control water valve, a plugged heater core, a disconnected or plugged heater hose.
2 - the system is in fact getting heat, but your heat is bypassed/lost due to dashboard vent and blend door errors breakage common with that era of jeep. have the valve/cor/heater hose flow checked. If that doesnt show issues, have the vent control system checked for blend door or dash door breakage. beware, its alot of labor to change the dash solenoids when they brake, ALOT of labopr (6 hours or more!) so if you are committed to fixing it because a solenoid and/or sensor broke in there, I highly recommend you chaneg ALL solenoids wuith new rather than risk another breaking in a month and the 6 hours of labor must be repeated.

Temp. actuator stuck on heat , probably . Manual or automatic climate control . Electrically controlled temp actuator , or the door is stuck in heat side.

My retired uncle has a 97 cadillac deville sts that runs well but after a short distance or time idling begins to overheat. He has replaced the water pump, thermostat and had the radiator and head gasket checked. Unfortunately he lives in a rural area and there is no local cadillac dealership for diagnostic repairs.