GMC SIERRA 1995 Manual page 435

I
Maintenance Schedule I
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Diesel Engines
(Continued)
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Drain, flush and refill the cooling system with new coolant (or every 24
months, whichever occurs first). See "Engine Coolant" in the Index for
what to use. An Emission Control Service.
Also inspect the hoses and replace them if they are cracked, swollen or
deteriorated. Tighten all hose clamps (except constant tension clamps).
Remove debris and clean the outside of the radiator and air
conditioning condenser. Wash the radiator neck. To ensure proper
operation, pressure test the radiator and cap.
0
Replace air cleaner filter. Replace filter more often under dusty
conditions. An Emission Control Service.
*
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For 2-Wheel Drive vehicles only: Clean and repack the front wheel
bearings (or at each brake relining, whichever occurs first).
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Check the crankcase depression regulator valve system for any worn,
plugged or collapsed hoses. See service manual. An Emission Control
Service.
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Replace fuel filter. Replace filter sooner if it is clogged.?
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Check the EGR System (if equipped) (except Code F engine) as
described in the service manual. An Emission Control Service.
0
Inspect accessory drive (serpentine) belt for cracks, fraying and wear
and check belt for proper tension. Adjust or replace belt as needed. An
Emission Control Service.
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Inspect shields and underhood insulation for damage or looseness.
Adjust or replace as required. This is a Noise Emission Control
Service. Applicable only to vehicles sold in the United States.
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Check the air intake system installation to assure that gaskets are
properly sealed and that all hose connections, fasteners and other
components are tight. Also check to be sure that the air cleaner housing
is properly seated, the cover fits tightly and the wing nuts are tight.
Tighten connections and fasteners or replace damaged parts as
necessary. This is a Noise Emission Control Service. Applicable only
to vehicles sold in the United States.
0
If your engine has a thermostatically controlled cooling fan, inspect all
hoses and ducts for proper hook-up (or every 12 months, whichever
occurs first). Be sure the valve works properly. This is a Noise
Emission Control Service. Applicable only to vehicles sold in the
United States.
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