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rpmdiag
rpmdiag, Tech and Instructor
Category: BMW
Satisfied Customers: 6976
Experience:  Since 1975
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2001 z3 1.9 l overheats on highway runs, fine around town.

Customer Question

2001 z3 1.9 l overheats on highway runs, fine around town. Just replaced the head and all the gaskets.
JA: Have you checked the coolant? Have you checked for a leak in the cooling system?
Customer: Checked the coolant no leaks bled the system. Heater does blow hot air. Fan does work.
JA: What is the model of your '01 BMW?
Customer: Z3 1.9l
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: Yes I am hoping to fix it myself
JA: Anything else you think the mechanic should know?
Customer: Can't think of anything have had it on an anylizer tested the fan and the thermostat appears to be reading correctly
Submitted: 5 months ago.
Category: BMW
Expert:  rpmdiag replied 5 months ago.

Hi, welcome to Just Answer. I’m Ron and I’ll be helping you
today.
Before we get started though, Please understand that I don't know
your skill level or tools you have to assist us. Also understand that
I can't see, smell, hear, or touch the vehicle either, so patience is
appreciated. JA is a great Q/A site, but it does NOT replace a
repair shop.
My goal is to make you happy and get a great rating in return for
my time. Sometimes I have to give you bad news that I know you
didn’t want to hear, so please don’t shoot the messenger.

This sounds like a weak water pump due to fins on the impeller being worn down and decayed away. Flow is very important, so please check for any blockage in the radiator too.

Thanks, Ron

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