Problem for BMW Cars
Generic problem for all BMW Z3 Cars
1998 bmw Z3 running hot replaced the...
1998 bmw Z3 running hot replaced thermostat and continues to run hot replaced aluminum engine 10 months ago,with cast iron engine with 68,000 miles
Best Solution
posted on Oct 03, 2009
Rank: Guru
Rating: 92%, 20 votes
cast iron does not dissapate heat as well as aluminun. may have to change several sensors to ones for the cast engine and possibly a radiator. but its gonna run hotter than aluminum in any case
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Asker's Testimonial
"
Thanks chester135, very helpful, better info than I got from my serv tech who installed cast engine
" - dtims92418
Solution #2
posted on Oct 03, 2009
Rank: Guru
Expert
Rating: 89%, 241 votes
water pump, cooling fans, and coolant level. are additional culprits
Was this helpful?1 person thought this was helpful
Asker's Testimonial
"
guru, good info will have all checked a 2nd time
" - dtims92418
Solution #3
posted on Dec 05, 2009
Rank: Guru
Expert
Rating: 88%, 204 votes
When the car is completely cool,check the electric fan(s) for smooth rotation.
Clean/check/change the thermo sensor,contact and wire.
===
Excavate air pocket in coolant system / check for head gasket leak
This test will kill two birds with one stone.
===
MAKE SURE THE COOLANT SYSTEM and ENGINE IS COLD!
RAN THIS TEST IN A WELL VENTILATED AREA ONLY!
You will spill some coolant during this air pocket purge test.......BE
KIND TO THE ENVIRONMENT and ANIMAL please clean up after the test!
===
Put the front end on a pair of ramp or park your car on a VERY STEEP HILL (radiator facing top of the hill) .
Top of the coolant reserve tank
Let it ran for 10-15 minutes.
Monitor for air pockets escaping from coolant reserve tank.
Small amount of bubbles is OK at 1-5 minute mark
After the thermostat open up (after 195 F warm up) at
5-12 minute mark or after high idle you should see less bubbles.
If you do not see any in rush of bubbles then your thermostat may be
partially stuck or rusted badly inside the thermostat hosing.
Give the thermostat host few gentle taps.
If you see larger bubbles surfacing after 15 minutes then should do a
hydrocarbon (HC) dye test to test for potential head gasket leak.
Let engine cold down and top off coolant reserve tank.
Start monitor for coolant lost
===
A coolant flush is require every 2 years or 24,000 miles.
I recommend the thermostat that has a relief pop-let to reduce the change of burst radiator and coolant hoses.
Make sure you get a new thermostat gasket,black RTV and fresh coolant for the job.
===
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