ENGINE COOLANT HEATER REPAIR (Cont).
CLEANING AND INSPECTION
Clean all carbon from burner assembly. Ensure that all holes, ports, and passages are clear of
obstructions. Clean any accumulation of dirt from case.
Inspect flame switch tube for bends or distortion. Metal rod in switch tube must extend at least
1/16 in. (1.59 mm) above top of tube. Replace switch if any of these conditions exist.
Inspect all leads for damage. Inspect connectors for looseness or corrosion. Replace if any of
these conditions exist.
Inspect burner assembly and heat exchanger for damage or burn through. Replace if damaged
or burnt through.
vaporizer for damage. Replace if damaged.
fan for damage. Replace if damaged.
brush and spring assemblies for distorted springs. If brushes are less than 1/4 in.
(6.35 mm) long, replace brushes.
Inspect coolant motor parts for damage. Replace
Inspect coolant hoses for cracks or deterioration.
any parts if damaged.
Replace if any of these
10. Inspect fittings on fuel control for damage. Replace if damaged.
vaporizer (44), vaporizer
retainer (43), and 2 screws.