Over Heating ERROR again.

bmystic · 01-11-2010, 03:41 PM

I just got it back from the shop recently, and it happens again. "Over Heating error"

The shop tested for leeks, and it was fine. They said that it’s not the water pump, and they can't duplicate the error. I check the rad. coolant it was full, after the car cool down of course. What do you think it is? Your help would be appreciated.

2kaccordocoupe · 01-11-2010, 03:55 PM

Maybe you have air in the system. Air bubbles or pockets can cause over heating... Try bleeding the system.
It could also be a faulty thermostat.

ENINTY · 01-11-2010, 05:01 PM

Quote:

Originally Posted by 2kaccordocoupe

Maybe you have air in the system. Air bubbles or pockets can cause over heating... Try bleeding the system.
It could also be a faulty thermostat.

It is probably not the thermostat. The thermostat is electric and fails in the open position. If the thermostat mechanically fails it triggers the Service Engine Soon light and reports BMW fault code 2EF4: 2EF4 map thermostat, mechanics Error.

It might just be a bad temperature sensor. Does the car actually overheat?

bmystic · 01-11-2010, 06:28 PM

Quote:

Originally Posted by ENINTY

It is probably not the thermostat. The thermostat is electric and fails in the open position. If the thermostat mechanically fails it triggers the Service Engine Soon light and reports BMW fault code 2EF4: 2EF4 map thermostat, mechanics Error.

It might just be a bad temperature sensor. Does the car actually overheat?

I hope that the case. I'm taking my car in on wed. maybe this time they can solve the issue. To answer your ? I had to wait at least an hour for my car to cool down. So I guess it does over heat. I hope that helps.

cb1111 · 01-11-2010, 07:27 PM

Quote:

Originally Posted by bmystic

...The shop tested for leeks, and it was fine...

Not finding leeks in your cooling system is good.

Did they also check for leaks?

Sorry, I couldn't resist.

Chief009 · 01-11-2010, 08:29 PM

Quote:

Originally Posted by bmystic

I just got it back from the shop recently, and it happens again. "Over Heating error"

The shop tested for leeks, and it was fine. They said that it’s not the water pump, and they can't duplicate the error. I check the rad. coolant it was full, after the car cool down of course. What do you think it is? Your help would be appreciated.

I had an overheating issue last week. My fan was going crazy! Had car towed to the dealership and was told that the water pump was the culprit. Hope that this is not a pattern.....

goff · 01-11-2010, 08:36 PM

does the cooling fan come on at all?

bmystic · 01-11-2010, 09:36 PM

Quote:

Originally Posted by Chief009

I had an overheating issue last week. My fan was going crazy! Had car towed to the dealership and was told that the water pump was the culprit. Hope that this is not a pattern.....

Yea that's exactly what happen. My cooling fan was going Crazy! That sucks, maybe it's the water pump gone bad. I wonder, how come they didn't find that out the first time around.

ENINTY · 01-12-2010, 11:56 AM

Quote:

Originally Posted by bmystic

I hope that the case. I'm taking my car in on wed. maybe this time they can solve the issue. To answer your ? I had to wait at least an hour for my car to cool down. So I guess it does over heat. I hope that helps.

It would be normal for any car to have to cool down for an hour before you could open the coolant reservoir to reduce the possibility of being scalded. When the coolant is hot it is under about 16 PSI of pressure. Opening the cap lets the coolant escape the system.

sherlock · 01-12-2010, 06:11 PM

Here's an easy thing to try... The cooling system is under pressure and if the pressure doesn't hold properly, the car will overheat. Try a new radiator cap or recovery tank cap if that's pressurized. Much cheaper than water pump and other stuff.

JamesUKE92 · 01-26-2010, 02:56 PM

Hi bmystic, any update on this? My E92 330i is currently out of action due to this problem. I don't want to pay the Stealers £800 for putting a new water pump in, so tomorrow I'm getting it on a lift and investigating the water pump / thermostat... Did you say yours was only blowing cold air inside the car? That's what mine is doing too.

I spoke to one of the friendly tech guys at my local dealer and he admitted that the early water pumps were failing a lot, and the design has now been changed, but that BMW won't officially admit to this and will not cover the cost of their design flaw...

JamesUKE92 · 01-27-2010, 10:55 AM

Just had car on ramp and took undertray off, I think prob water pump fail as 12v getting to pump power and control wires. Ordered new pump and thermostat from main dealer. Will post pics of pump from underneath if anyone is interested...

F32Fleet · 01-27-2010, 11:27 AM

Would a small gasket leak cause this? (Mayonaise oil underneath the oil cap). Could it be so small that he's not seeing white smoke?

JamesUKE92 · 01-27-2010, 11:45 AM

Could a gasket leak cause loss of in cabin heating? I would guess prob not...

hotnikks · 01-27-2010, 12:03 PM

Post pics please...

JamesUKE92 · 01-27-2010, 01:09 PM

Here are a few pics I took of the pump today... Not great to see what is what I'm afraid, not much clearance under there and no wide-angle lense.

I think I can get the pump out by undoing the anti-roll bar mounts and swinging it down out of the way... I'll try to remember to get some better pics when I do the actual replace.

JamesUKE92 · 01-27-2010, 01:13 PM

By the way, you can see the pump in all it's glory at the MWerks gallery:

http://www.mwerks.com/gallery/galler...=&dispsize=800

Lots more interesting N52 engine pics:

http://www.mwerks.com/gallery/galler...%206%20Engine#

JamesUKE92 · 02-02-2010, 04:14 PM

For a load more pics of the pump and stat replace I just did, see my posts here:

http://www.e90post.com/forums/showthread.php?t=347412

401FlaGATOR · 02-02-2010, 04:25 PM

do you live close to the ocean? There seems to be a lot of rust on some of the metallic clips and hoses. I don't think my car has that much rust..

Just curious..

skim7x · 02-02-2010, 04:30 PM

Quote:

Originally Posted by bmystic

I just got it back from the shop recently, and it happens again. "Over Heating error"

The shop tested for leeks, and it was fine. They said that it’s not the water pump, and they can't duplicate the error. I check the rad. coolant it was full, after the car cool down of course. What do you think it is? Your help would be appreciated.

why did they test for leeks?

good luck with the prob... please let us know!

JamesUKE92 · 02-02-2010, 04:59 PM

I don't live near the ocean... I was curious about the oxidisation myself, seems only limited to those power-steering hose ends. Perhaps all the salt on the roads here in winter. Anyway after fixing the water pump, I gave them a nice spray of lithium grease, so hopefully should slow down any further decay!

01-11-2010, 03:41 PM	#1
bmystic Private 8 Rep 53 Posts Drives: bmw330xi Join Date: Jun 2009 Location: va iTrader: (0)	Over Heating ERROR again. I just got it back from the shop recently, and it happens again. "Over Heating error" The shop tested for leeks, and it was fine. They said that it’s not the water pump, and they can't duplicate the error. I check the rad. coolant it was full, after the car cool down of course. What do you think it is? Your help would be appreciated.
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01-11-2010, 03:55 PM	#2
2kaccordocoupe Brigadier General 1274 Rep 4,703 Posts Drives: Former ///M Driver Join Date: Nov 2008 Location: The 6ix iTrader: (2)	Maybe you have air in the system. Air bubbles or pockets can cause over heating... Try bleeding the system. It could also be a faulty thermostat.
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01-11-2010, 08:36 PM	#7
goff ///M Tech 6 Rep 89 Posts Drives: F30 Join Date: May 2008 Location: NY iTrader: (2)	does the cooling fan come on at all?
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01-12-2010, 06:11 PM	#10
sherlock New Member 0 Rep 23 Posts Drives: 2006 325i Join Date: Nov 2009 Location: Berlin, NJ USA iTrader: (0)	Here's an easy thing to try... The cooling system is under pressure and if the pressure doesn't hold properly, the car will overheat. Try a new radiator cap or recovery tank cap if that's pressurized. Much cheaper than water pump and other stuff.
	Appreciate 0 Quote

01-26-2010, 02:56 PM	#11
JamesUKE92 New Member 16 Rep 27 Posts Drives: E92 330i Join Date: Oct 2009 Location: UK iTrader: (0)	Hi bmystic, any update on this? My E92 330i is currently out of action due to this problem. I don't want to pay the Stealers £800 for putting a new water pump in, so tomorrow I'm getting it on a lift and investigating the water pump / thermostat... Did you say yours was only blowing cold air inside the car? That's what mine is doing too. I spoke to one of the friendly tech guys at my local dealer and he admitted that the early water pumps were failing a lot, and the design has now been changed, but that BMW won't officially admit to this and will not cover the cost of their design flaw...
	Appreciate 0 Quote

01-27-2010, 10:55 AM	#12
JamesUKE92 New Member 16 Rep 27 Posts Drives: E92 330i Join Date: Oct 2009 Location: UK iTrader: (0)	Just had car on ramp and took undertray off, I think prob water pump fail as 12v getting to pump power and control wires. Ordered new pump and thermostat from main dealer. Will post pics of pump from underneath if anyone is interested...
	Appreciate 0 Quote

01-27-2010, 11:27 AM	#13
F32Fleet Lieutenant General 3572 Rep 10,352 Posts Drives: 2015 435i Join Date: May 2005 Location: Southeastern US iTrader: (0)	Would a small gasket leak cause this? (Mayonaise oil underneath the oil cap). Could it be so small that he's not seeing white smoke?
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01-27-2010, 11:45 AM	#14
JamesUKE92 New Member 16 Rep 27 Posts Drives: E92 330i Join Date: Oct 2009 Location: UK iTrader: (0)	Could a gasket leak cause loss of in cabin heating? I would guess prob not...
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01-27-2010, 12:03 PM	#15
hotnikks Private First Class 11 Rep 164 Posts Drives: F30 335i-Msport Join Date: May 2009 Location: Raleigh iTrader: (1)	Post pics please... __________________ 06 E90 330i 6-spd (Retired) 14 F30 335i M Sport ZF
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01-27-2010, 01:09 PM	#16
JamesUKE92 New Member 16 Rep 27 Posts Drives: E92 330i Join Date: Oct 2009 Location: UK iTrader: (0)	Here are a few pics I took of the pump today... Not great to see what is what I'm afraid, not much clearance under there and no wide-angle lense. I think I can get the pump out by undoing the anti-roll bar mounts and swinging it down out of the way... I'll try to remember to get some better pics when I do the actual replace. Attached Images
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01-27-2010, 01:13 PM	#17
JamesUKE92 New Member 16 Rep 27 Posts Drives: E92 330i Join Date: Oct 2009 Location: UK iTrader: (0)	By the way, you can see the pump in all it's glory at the MWerks gallery: http://www.mwerks.com/gallery/galler...=&dispsize=800 Lots more interesting N52 engine pics: http://www.mwerks.com/gallery/galler...%206%20Engine#
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02-02-2010, 04:14 PM	#18
JamesUKE92 New Member 16 Rep 27 Posts Drives: E92 330i Join Date: Oct 2009 Location: UK iTrader: (0)	For a load more pics of the pump and stat replace I just did, see my posts here: http://www.e90post.com/forums/showthread.php?t=347412
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02-02-2010, 04:25 PM	#19
401FlaGATOR First Lieutenant 70 Rep 328 Posts Drives: E90 325i ZSP, F30 320i ZSP Join Date: Oct 2006 Location: Pembroke Pines, FL iTrader: (0)	do you live close to the ocean? There seems to be a lot of rust on some of the metallic clips and hoses. I don't think my car has that much rust.. Just curious..
	Appreciate 0 Quote

02-02-2010, 04:59 PM	#21
JamesUKE92 New Member 16 Rep 27 Posts Drives: E92 330i Join Date: Oct 2009 Location: UK iTrader: (0)	I don't live near the ocean... I was curious about the oxidisation myself, seems only limited to those power-steering hose ends. Perhaps all the salt on the roads here in winter. Anyway after fixing the water pump, I gave them a nice spray of lithium grease, so hopefully should slow down any further decay!
	Appreciate 0 Quote