2000 BMW 1 Series 1.9 ise

22 points

Problem added: Mar 31, 2011 (9 years ago)
hi everyone my car keeps overheating it got that hot the other day it blew a hole in plastic pipe at back of engine ,ive now replaced it but have noticed a little water pump at rigth hand side of the engine bay is not working so dissconeccted it and joined the two pipes that come from it together and then it no longer over heats but as soon as i put a new one on it doing it again , does anyone now what this pumps for and why it makes my car overheat , had the head checked and thats ok , hope this is enuff info PLEASE HELP

Car details
Car: BMW 1 Series
Variant: 1.9 ise
Model Year: 2000
Category: Engine & Drivetrain
Replies and Fixes
22 points

Mar 31, 2011 (9 years ago)
Top Fixer
395 points

Apr 26, 2011 (9 years ago)
its basically an extra coolant pump. for the heater. what i suspect you have is an air lock in the system. the little plastic pipe on the back of the cylinder head that let go is the weakest point in the coolant system. if the extra coolant pump is blocked then the water will not circulate properly and cause the engine to run hotter. replace the pump, back fill the heater matrix and bleed system at the screws on the radiator and the thermostat housing with pressure tester first before firing it up. on start up, rev the arse off it three times then allow to idle. little trick!!! turn on heater and wait for heat. top up header tank and road test!!
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