Close
QUESTIONS

RepairPal is your advocate for car care advice and guidance

Q: what are the reasons for the cooling system to boil or fluctuating cooling temp on 1998 BMW 540i

also heater is not working properly
Get a Repair Estimate
Guaranteed by certified locations nationwide. Learn more
RepairPal estimates are guaranteed at over 1,700 quality certified locations nationwide. Learn more
Sounds like the thermostat is bad. Need to replace soon but make sure coolant is at proper level and not leaking. Other cause is heater core obstruction not allowing fluid to flow through properly. Hopefully, not the water pump.
Didn't find what you were looking for?