@

Tuesday, October 18, 2011

Cadillac Thermostatic Air Cleaner?


Thermostatic Air Cleaner (TAC or THERMAC)



All 1970 and later engines covered in this guide utilize the TAC/THERMAC system. This system is designed to warm the air entering the carburetor when underhood temperatures are low, and to maintain a controlled air temperature into the carburetor at all times. By allowing preheated air to enter the carburetor, the amount of time the choke is on is reduced, resulting in better fuel economy and lower emissions. Engine warm-up time is also reduced.
The Thermac system is composed of the air cleaner body, a filter, sensor unit, vacuum diaphragm, damper door, and associated hoses and connections. Heat radiating from the exhaust manifold is trapped by a heat stove and ducted to the air cleaner in order to supply heated air to the carburetor. A movable door in the air cleaner case snorkel allows air to be drawn in from the heat stove (cold operation) or from underhood air (warm operation). The door position is controlled by the vacuum motor, which receives intake manifold vacuum as modulated by the temperature sensor.

SYSTEM CHECKS



See Figure 1
  1. Check the vacuum hoses for leaks, kinks, breaks, or improper connections and correct any defects.
  2. With the engine off, check the position of the damper door within the snorkel. A mirror can be used to make this job easier. The damper door should be open to admit outside air.
  3. Apply at least 7 in. Hg of vacuum to the damper diaphragm unit. The door should close. If it doesn't, check the diaphragm linkage for binding and correct hookup.
  4. With vacuum still applied and the door closed, clamp the tube to trap the vacuum. If the door doesn't remain closed, there is a leak in the diaphragm assembly.


Click image to see an enlarged view
Fig. Fig. 1: Common THERMAC or TAC air cleaner

REMOVAL & INSTALLATION



See Figure 2
Vacuum Motor
  1. Remove the air cleaner.
  2. Disconnect the vacuum hose from the motor.
  3. Drill out the spot welds with a 1 / 8 in. bit ( 1 / 16 in. on later models), then enlarge as necessary to remove the retaining strap.
  4. Remove the retaining strap.
  5. Lift up the motor and cock it to one side to unhook the motor linkage at the control damper assembly.
To install:
  1. To install the new vacuum motor, drill a 7 / 64 in. hole in the snorkel tube as the center of the vacuum motor retaining strap.
  2. Insert the vacuum motor linkage into the control damper assembly.
  3. Use the motor retaining strap and a sheet metal screw to secure the retaining strap and motor to the snorkel tube.
Make sure the screw does not interfere with the operation of the damper assembly. Shorten the screw if necessary.


Click image to see an enlarged view
Fig. Fig. 2: Vacuum motor removal - 1986-87 8-250 engine
Temperature Sensor
See Figures 3 and 4
  1. Remove the air cleaner.
  2. Disconnect the hoses at the air cleaner.
  3. Pry up the tabs on the sensor retaining clip and remove the clip and sensor from the air cleaner.
  4. Installation is the reverse of removal.


Click image to see an enlarged view
Fig. Fig. 3: Temperature sensor - 1986-87 8-250 engine


Click image to see an enlarged view
Fig. Fig. 4: Schematic of the vacuum motor operation








    For more car related problem troubleshooting:---

    This are the sections, you can go through and click the link to read its troubleshooting.

    ---------

    The car will not start?

    -----------------

    Car will not crank?


    -----------

    Car has no spark?


    -------------

    How to troubleshoot car battery?

    -----------------

    How to test starter solenoid?

    http://schematicsdiagram.blogspot.com/2011/06/how-to-test-starter-solenoid.html

    --------------------

    How to test cars starter?

    http://schematicsdiagram.blogspot.com/2011/06/how-to-test-cars-starter.html

    How to replace starter in car?



    -----------

    car will turn over but will not start?



    -----------------

    The Brake Indicator Light Stays On dash of car?

    The ABS and Traction Control Lights stays ON dash of car?


    Check Engine Light On car?

     -------------------------

    How to replace Interior Lights on car?

    Car lights not working, even after replacing the bulb/lamp?

    Click this link below:--
     ---------------

    How to replace head lights on car?

    --------------------

    How to replace Parking, turn, and Brake Lights on car?

    How to replace power window motor in car?

    How to test relays on car?

     -----------------------------

    How to troubleshoot Engine Misfires?

    ------------

    The spark plug firing order for car?

    ------------------------

    Where is the Thermostat located in car?

    How to recharge AC on Auto/Truck/car?

    -------------------
    How to trouble shoot speedometer?
    To Order car parts online:--To get heavy discount on car parts .Click this link below:----

    How to Replace Coil Springs?

    How to Replace an Oil Pan Gasket?


    How to Replace a Fuel Injector


    How to Replace a C.O.P. Type Ignition Coil?

    How to Replace a Fuel Pressure Regulator?

    How to Replace a Fuel Pump?

    How to Replace a Rear Lift Gate Locking Mechanism?


    How to Clean a Fuel System

    How to Replace an Ignition Coil


    How to Replace a Windshield



    How to Replace a Mass Air Flow Sensor


    How to Replace a Rear Distance Sensor

    How to Replace a Muffler


    How to Replace an Engine


    How to Replace an Intake Manifold Gasket



    How to Replace an Oil Pump


    How to Lubricate a Brake Pedal Linkage ?

    How to Replace a Windshield Wiper Motor



    How to Replace a Distributor Cap


    How to Replace a Door Weather Stripping


    How to Replace a Freeze Plug


    How to Replace a Head Gasket

    How to Replace a Heater Core

    How to Replace Spark Plugs?


    How to Replace a Rear Axle Bearing?

    How to Replace a Front Bumper Cover



    How to Replace a Manual Transmission



    How to Replace a Headlight Bulb



    How to Replace a Headlight Switch



    How to Replace Windshield Wiper Blades


    How to Replace a Cooling Fan


    How to Replace a Catalytic Converter


    How to Replace an Engine Mount



    How to Replace a Fog Light Assembly



    How to Change Engine Oil and Filter



    How to Replace a Power Seat Switch


    How to Replace a Rear Main Seal


    How to Repair a Defroster Grid



    How to Replace an AWD Transfer Case


    How to Replace a Plastic License Plate Bracket?

    How to Replace a Power Seat Motor


    How to Replace Power Steering Fluid


    How to Replace a Power Window Switch



    How to Replace a Quarter Glass Panel?


    How to Pressure Test a Radiator and Cap


    How to Replace a Radiator


    How to Repair a Hood.

    How to Replace an Energy Absorber


    How to Replace Heater Core Hoses


    How to Replace a Thermostat.


    How to Rotate Tires.

    How to Replace Wheel Lug Nuts


    How to Replace a Tire Valve Stem



    How to Change a Flat Tire



    How to Replace Leaf Springs


    How to Replace a Heater Control Valve


    How to Replace Transmission Cooler Lines


    How to Replace an Ignition Control Unit


    How to Replace a Brake Hose


    How to Replace a Transfer Case Rear Output Seal


    How to Replace a Seat Belt and Seatbelt Retractor


    How to Replace a Power Steering Rack


    How to Bleed Brakes with a Tool


    How to Replace a Tail Light Bulb


    How to Check Automatic Transmission Fluid Level



    How to Change Automatic Transmission Fluid and Filter


    How to Replace Vacuum Hoses



    How to Replace an Air Intake Boot



    How to Replace a Valve Cover Gasket


    How to Replace a Water Pump


    How to Replace a Windshield Wiper Switch



    How to Replace Window Run Channel Seals


    How to Replace a Window Regulator



    How to Balance a Tire and Wheel




    How to Replace a Window Motor


    How to Adjust a Hood Release Latch?


    How to Replace a Radiator Support


    How to Replace a Rear Pinion Seal.


    How to Replace Battery Cables




    How to Replace a Proportioning Valve



    How to Replace an Upper Radiator Hose



    How to Replace a Lower Radiator Hose


    How to Replace a Timing Belt?

    How to Check for Loose or Worn Suspension 



    How to Check for Loose Steering System

    How to Replace an Oil Pressure Switch (Sensor)


    How to Replace a Fender Liner or Splash Shield



    How to Replace a Hood Insulator


    How to Replace a Rear Differential.

    How to Repair a Hood Hinge


    How to Replace a Brake Pedal Return Spring



    How to Replace a Door Shell.

    How to Replace a Transfer Case Front Output Seal


    How to Replace a Hood Latch/Lock Assembly


    How to Replace a Lift Gate Strut

    How to Replace Mud Flaps (Mud Guards)



    How to Check Differential Oil Leaks and Replace Oil.


    How to Replace a Mirror

    How to Replace a Transfer Case Shift Linkage



    How to Replace a Transmission Mount



    How to Replace a U-Joint


    How to Replace a Washer Tank


    How to Replace an A/C Line or Hose


    How to Replace a Heater and A/C Blower Motor


    How to Replace an ABS Control Unit



    How to Perform a Brake Adjustment




    How to Replace an Alternator Belt




    How to Replace an Emblem


    How to Replace an Exhaust Manifold Gasket


    How to Replace a Tail Pipe


    How to Replace Shock Absorbers


    How to Replace a Strut Assembly



    How to Replace a Driveshaft



    How to Replace a Wheel Cylinder


    How to Replace a Hood


    How to Replace a Brake Disc (Rotor)


    How to Replace a Metal License Plate Bracket



    How to Replace a Power Steering Pump


    How to Perform a Basic Engine Tune-Up


    How to Perform a Basic Engine Tune Up-Oil Change



    How to Perform a Basic Engine Tune Up-Spark Plug and Wire Change

    How to Replace a Distributor Cap and Rotor ?



    How to Repair a Valance


    How to Replace a Turn Signal Switch


    How to Replace a Plastic Bumper Cover


    How to Replace a Parking Brake Cable


    How to Replace Windshield Wiper Blade Refills



    How to Replace a Corner Light


    How to Replace a Bumper Bracket or Side Support


    How to Replace a Washer Pump.

    How to Replace a Grille


    How to Replace a Locking Hub


    How to Replace a Fender


    How to Replace a Power Steering Hose


    How to Replace a Tailgate


    How to Replace a Soft Top


    How to Replace a Carburetor

    ­

    How to Replace a Bumper Trim



    How to Replace Trunk Strut


    How to Replace a Front End Cover


    How to Replace a Front Pipe


    How to Replace an Antenna Mast


    How to Replace a Side Marker Light Assembly


    How to Install a Carpet on car?

    How to Replace a Spoiler


    How to Replace a Mirror Glass on car?



    How to Replace a Step Bumper?


    How to Replace a Door Lock


    How to Replace a Throttle Body


    How to Replace a Throttle Position Sensor


    How to Replace a Grille Insert


    How to Replace a Fan Shroud Assembly



    How to Replace an Engine Splash Shield



    How to Replace a Turn Signal Light Assembly


    How to Replace a Headlight Assembly


    How to Replace a Park Light Assembly

    How to Replace an Expansion Tank



    How to Replace an Exhaust System


    How to Replace a Fender Trim


    How to Replace a Headlight Door


    How to Replace a Fan Shroud


    How to Replace a Harmonic Balancer


    How to Replace a Header Panel


    How to Replace a Fuel Tank


    How to Replace a Fuel Tank Cap


    How to Replace a Distributor


    How to Replace an EGR Valve


    How to Replace an Oxygen Sensor


    How to Replace an Ignition Wire Set


    How to Replace a Tail Light


    How to Replace a Door Handle


    How to Replace a Hood Strut


    How to Replace Tail Light Assembly


    How to Replace a Front Bumper


    How to Replace a Fuel Pump Assembly


    How to Replace an Axle Assembly


    How to Replace a Tailgate Handle


    How to Replace a Wheel Hub Assembly


    How to Replace a Control Arm


    How to Replace a Window Regulator with Motor


    How to Replace a Headlight



    How to Check the Brake Fluid Level

    How to Replace a Parking Brake Switch


    How to Replace a Blower Motor Resistor


    How to replace frost plug on car?

    Horn stopped working?


    How to clean egr valve on Isuzu Amigo?


    Cruise control stopped working?

    Car is stuck in park and the shift will not move?

    How to change the outer door weather strip?


    Car slows down when it gets hotter?


    Warning lights on and speedometer died?



    Car won't rev past 1900 rpms?




    No comments:

    Post a Comment

    @