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Originally Posted by gaboi68
I have a 91 9C1 with a frozen fan clutch, and its still moving air. Could that be the reason for the engine to overheat.
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No - if it's frozen the most that will happen is wasted gas. Until it breaks, that is. Of course, the water pump bearings will become damaged over time from such a condition. Overheating can be caused by many things - I assume you inspected the system for coolant level as well as any obvious broken hoses, leaks etc. Is there any coolant on the ground under the car, in the area of the water pump?
Does the car lose power as you increase speed? If so, there could be a restriction in the exhaust, i.e. plugged catalytic converter.
Other causes for overheating include, but are not limited to:
*Stuck thermostat.
*Retarded ignition timing.
*Exhaust system restrictions.
*Excessive carbon buildup
*Slipping or overheated transmission
*Restriction in the cooling system
*Blown head gasket(s)
*Excessive RPM for condition (i.e. running @ 60MPH with trans in 2)
*Failed water pump
*Inoperable fan clutch (freewheeling)
*Missing fan (I've seen this)