Changed thermostat, now overheating??
#21
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If someone wants to test their thermostat that is bad they can just stick it in a pot of water, let the water boil to test it - distilled water only of course. (that was a joke, you're only TESTING it)
#23
If you are having the same problems that i was having, then i would recommend removing the thermostat and just putting the housing back on. I replaced the oil separator a few months back due to the diaphram splitting inside. symptoms was constant 02 fault codes due to diaphragm causing a massive air leak making the car rough idle and bad mpg. When i got the engine light back on a few days ago i had the P0599 heater circuit plus the 02 codes. I thought i had another air leak pus the thermostat problem, although now ive put the thermostat housing back on and cleared the codes, im not getting any codes whatsoever. So i presume that the bad thermostat was causing the other codes as well.
Like i said i will keep you updated when i fit another thermostat to see if my problem is electrical.
Like i said i will keep you updated when i fit another thermostat to see if my problem is electrical.
#24
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My Ride: 2005 E60 525i at
Hey guys. I am experiencing about the same problem on my 2004 525i. My wife was driving around when it suddenly overheated. I later found out that the fan was not functional. But when I disconnect the wire on the bottom left hose of the radiator the fan turns on. But still,the care overheats, am starting to suspect the thermostat now.
#25
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Here is the page from the Bentley manual:
IMG_0082.jpg
What made you replace the thermostat in the first place? Perhaps your water pump is spent??
#26
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My Ride: 2008 550i & 2009 X6 35i
Hey guys. I am experiencing about the same problem on my 2004 525i. My wife was driving around when it suddenly overheated. I later found out that the fan was not functional. But when I disconnect the wire on the bottom left hose of the radiator the fan turns on. But still,the care overheats, am starting to suspect the thermostat now.
Last edited by rm4two; 02-03-2014 at 11:02 AM.
#27
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Here's another one for you guys, not to intrude on the thread, just didn't want to create another thread:
1. Over heat indicator goes on, radiator fluid is at max.
2. Fan is working properly, turns on and activates when hot.
Prior to overheat warning: when the heater is turned on with the car in motion, it blows warm/hot air. After a few minutes, suddenly the air becomes cold followed by the over heating warning messages.
1. Over heat indicator goes on, radiator fluid is at max.
2. Fan is working properly, turns on and activates when hot.
Prior to overheat warning: when the heater is turned on with the car in motion, it blows warm/hot air. After a few minutes, suddenly the air becomes cold followed by the over heating warning messages.
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