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AMC Coupes/Sedans/Wagons 1975-1988 Repair Information

Exhaust Manifold Heat Valve


See Figure 1

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Fig. Fig. 1: Typical exhaust manifold heat valve used on V8 enginesother models are similar

The exhaust manifold heat valve should be inspected and lubricated every 30,000 miles.

On 6-cylinder engines, the valve is located in the center lower portion of the exhaust manifold, on the left-hand side of the engine.


Be sure that the manifold is cool before carrying out inspection and lubrication.

  1. To check the heat valve operation, turn the valve shaft by hand.
  3. Lubricate the heat valve with one of the special heat valve lubricants made for this purpose. Do not use grease or oil.
  5. Check valve operation again.

See Figures 2 through 6

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Fig. Fig. 2: There are typically 3 types of accessory drive belts found on vehicles today

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