Tip & How-To about BMW 318
The below checks are generally intended to apply to any make of motor vehicle, (even though, to post this tip I had to select a particular make & model).
Overheating may be caused by many things.
Ensure engine tune or other mechanical disfunction is not contributing to the overheat problem.
Ensure there are no vacuum leaks on the engine air induction system.
If gas bubbles are apparent in the coolant reservoir when the engine is running the motor it may have a blown headgasket - (if confirmation is required, go to a radiator shop and request a "combustion gas detector" test).
If no obvious mechanical problems exist I suggest you carry out the following checks:-
1) Check coolant system is not leaking fluid due cracked/perished hose or hose fitting, leaking water pump etc,
2) Check engine cooling fan/s are operating as required when engine temp rises above cut-in threshold - check fan control relay is ok,
3) Check for collapsing radiator hose on suction side of water-pump when motor revs raised above idle.
4) Check coolant reservoir pressure cap is serviceable,
5) Check coolant system is properly filled - carry out any bleed off procedure specified to clear any air locks- (ensure heater core coolant flow is turned on).
6) Check condition of radiator core:-
i) for blockage of air flow to (bugs/grass etc),
ii) for core internal blockage to coolant flow.
7) Check or replace the thermostat.
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