Most likely thermostat stuck open. replaceOriginally Posted by stx133
Paul
my 94 540 seems to run cold on the freeways. while doing 100kph on the freeway when ambient is below 10 deg c the temp needle sits in the blue. when i stop in traffic it slowly rises to half and sits nicely.
this means that i have next to no heating while fwy driving. it was 0 deg c this morning. not nice...
any comments? is is possible the thermostat is not closing or somting similar. one mechanic i spoke to said that the cooling system on the bmw is different than local (australian) built cars ad opperates differently, ie: no surge tank, holds pressure when cold....
1994 540i Auto
live fast; die sideways
13.3 @ 104mph (not in the 540)
15.4 @ 150 Kph in the 540 (24/9/07)
Most likely thermostat stuck open. replaceOriginally Posted by stx133
Paul
same here, i'd suspect thermostat complications.
there is a quick test if you open the bonnet with the needle just inside the blue i think the top radiator hose should be cold NOT hot. although i am not too sure but i have the same issue as well.
Germans: Why can't they make everything?
i had that exact problem, it was the thermostat jammed open.
1990 BMW 535i Exec
Sounds like t-stat stuck open like others said, get a new one. If that doesn't help you may have a t-stat that is opening at too low a temp.