FIAT Uno 45 - Manual (Page 58)

Fault finding - cooling and heating systems
2•8 Cooling and heating systems
Overheating
Ⅵ Ⅵ Insufficient coolant in system
Ⅵ Ⅵ Pump ineffective due to slack drivebelt
Ⅵ Ⅵ Radiator blocked either internally or externally
Ⅵ Ⅵ Kinked or collapsed hose causing coolant flow restriction
Ⅵ Ⅵ Thermostat not working properly
Ⅵ Ⅵ Engine out of tune
Ⅵ Ⅵ Ignition timing retarded or auto advance malfunction
Ⅵ Ⅵ Cylinder head gasket blown
Ⅵ Ⅵ Engine not yet run-in
Ⅵ Ⅵ Exhaust system partially blocked
Ⅵ Ⅵ Engine oil level too low
Ⅵ Ⅵ Brakes binding
Engine running too cool
Ⅵ Ⅵ Faulty, incorrect or missing thermostat
Loss of coolant
Ⅵ Ⅵ Loose hose clips
Ⅵ Ⅵ Hoses perished or leaking
Ⅵ Ⅵ Radiator leaking
Ⅵ Ⅵ Filler/pressure cap defective
Ⅵ Ⅵ Blown cylinder head gasket
Ⅵ Ⅵ Cracked cylinder block or head
Heater gives insufficient output
Ⅵ Ⅵ Engine overcooled (see above)
Ⅵ Ⅵ
Heater matrix blocked
Ⅵ Ⅵ Heater controls maladjusted or broken
Ⅵ Ⅵ Heater control valve jammed or otherwise
defective