Overheating..again

Z4 Coupe · 03-04-2016, 12:38 PM

Hello all.

So the Z4 Coupe 3.0si is over heating again. it has 86k miles on it.

I have replaced the expansion tank and thermostat (both with OEM parts)

I have noticed a trend on very cold days when it over heats. Here is what happens:

1. Start the car (sitting over night) and the small engine fan starts to run from the start and car runs a bit ruff

2. Car takes a longer time to get to operating temperature temp (needle in the middle)

3. Car has no heat for approx 10mins after reached operating temperature. After 10mins the heat starts slowly

4. 5 mins after the heater starts working the car starts to over heat

5. Overheating temperature fluctuates depending on driving conditions. After a few minutes the temp gets hotter.

Has anyone experienced similar conditions.

Next on tap is to replace water pump and coolant temp sensor (lower rad hose)

Will this fix the issue or should I be replacing other things?

Help is much appreciated....thank you

inTgr8r · 03-04-2016, 01:05 PM

Same behaviour pre/post parts replacement?

SaltyNC · 03-04-2016, 01:22 PM

Could be the water pump isn't performing well and isn't circulating the water through the heater coil very well (nor circulating cool water to the engine). It may be flowing but very poorly.

But #2 -- hmm.

Salty

inTgr8r · 03-04-2016, 01:24 PM

^agreed.
& With that mileage the cooling system should be updated if still original

Z4 Coupe · 03-04-2016, 01:54 PM

Quote:

Originally Posted by inTgr8r

Same behaviour pre/post parts replacement?

Had the same issues before replacing the Expansion Tank and Thermostat. After replacing those..had no issues for 6 months. Then yesterday it happened again. Have not driven it since then

Steeler · 03-04-2016, 03:19 PM

Air lock?

GuidoK · 03-04-2016, 08:44 PM

I know the thermostat is partly controlled by the ecu. For that it needs temp sensors. There's one in the hose, but I think there's also one in the block (cylinder head).

Replacing (or checking) the waterpump is definately a good idea. But it's strange that you hadn't had the problems for 6 months, and now that it's cold you get these strange symptoms again. Interesting problem.
I dont know if the waterpump is also ecu controlled or that it's always on, but to me it sounds like either both waterpump and thermostat (so open (broken) thermostat prevents the engine to heat up quickly and the broken waterpump prevents enough flow that results in overheating), or a temp sensor and thermostat (thermostat still stuck open and inaccurate temp sensor prevents accurate waterpump control).
Or that air lock (but after 6 months?)

And what do you mean with the " and the small engine fan starts to run"?
I thought it only had one fan on the radiator and it's quite large?

Z4 Coupe · 03-07-2016, 12:53 PM

I believe there are 2 fans...there maybe a smaller fan close to the bigger fan. It sound like a fan..and is also present for approx 5 seconds after the car is off

Z4 Coupe · 03-07-2016, 03:20 PM

I'm looking at replacing the following parts. Can someone give me some feedback if these are good reliable brands? I don't track my car. Just street use...thanks

PART #: A0340B | OEM #: 11517586925 : Electric Water Pump, PIERBURG : $505.00

PART #: B0340B | OEM #: 11510392553 : Aluminum Bolts for Water Pump : $10.00

PART #: 11626B | OEM #: 34116779652 : Ceramic Front Brake Pad Set, BREMBO: $99.00 / set

PART #: 70286B | OEM #: 34357836795 : Front Brake Wear Sensor, OEM: $15.00

PART #: 31271B | OEM #: 11287628651 : Serpentine Belt, CONTITECH : $30.00

PART #: 4011B | OEM #: 13621433077 : Temperature Sensor, OEM : $30.00

Daemonblitz · 03-07-2016, 04:34 PM

Are you sourcing these from Worldpac by chance ?
Only thing I have used myself the belt itself, my E46 has it and no issues, honestly, for daily driving I think these will serve you just fine. That water pump is not much different from what an OEM one at package price is at the dealer too.

Z4 Coupe · 03-07-2016, 10:14 PM

Quote:

Originally Posted by Daemonblitz

Are you sourcing these from Worldpac by chance ?
Only thing I have used myself the belt itself, my E46 has it and no issues, honestly, for daily driving I think these will serve you just fine. That water pump is not much different from what an OEM one at package price is at the dealer too.

Thanks..no purchasing from Germanautoparts.ca . I was considering the textar pads instead of the brembo's..just for OEM feel and no issues..should I do brembo or textar? Does it make a difference?

Daemonblitz · 03-08-2016, 08:15 AM

Quote:

Originally Posted by Z4 Coupe

Thanks..no purchasing from Germanautoparts.ca . I was considering the textar pads instead of the brembo's..just for OEM feel and no issues..should I do brembo or textar? Does it make a difference?

I may be wrong but I believe the OEM pads are actually made by Textar.

Cyclops · 03-08-2016, 10:28 AM

Quote:

Originally Posted by Daemonblitz

I may be wrong but I believe the OEM pads are actually made by Textar.

OEM pads are Textar. They are very dusty IMO, I bought a set of Stoptechs and really like them.

Z4 Coupe · 04-20-2016, 10:33 AM

Thanks for your help all.

My INDY scanned for codes and it was a water pump failure. Although there was no check engine light, there still was a code when scanned. Ended up replacing: water pump, lower rad hose & sensor, Serpentine belt, brakes, coolant.

New owner should be happy

03-04-2016, 12:38 PM	#1
Z4 Coupe New Member 1 Rep 26 Posts Drives: E86 Coupe Join Date: May 2015 Location: Toronto, Canada iTrader: (0)	Overheating..again Hello all. So the Z4 Coupe 3.0si is over heating again. it has 86k miles on it. I have replaced the expansion tank and thermostat (both with OEM parts) I have noticed a trend on very cold days when it over heats. Here is what happens: 1. Start the car (sitting over night) and the small engine fan starts to run from the start and car runs a bit ruff 2. Car takes a longer time to get to operating temperature temp (needle in the middle) 3. Car has no heat for approx 10mins after reached operating temperature. After 10mins the heat starts slowly 4. 5 mins after the heater starts working the car starts to over heat 5. Overheating temperature fluctuates depending on driving conditions. After a few minutes the temp gets hotter. Has anyone experienced similar conditions. Next on tap is to replace water pump and coolant temp sensor (lower rad hose) Will this fix the issue or should I be replacing other things? Help is much appreciated....thank you __________________ E86 -Tint, LED's, Front Clear Corners, Rear Red Turn Signals, Proclip, ZHP Shift Knob, Sebring Exhaust "Friends Don't Let Friends Drive Stock"
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03-04-2016, 01:05 PM	#2
inTgr8r Lieutenant General 2426 Rep 11,667 Posts Drives: M2 Comp Join Date: Mar 2006 Location: Toronto iTrader: (10)	Same behaviour pre/post parts replacement? __________________ '21 M2C Hockenheim Silver '18 718 Cayman S Lava Orange (sold) '13 E92 M3 Santorini Blue (sold) '07 Z4 M Coupe Alpine White (sold)
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03-04-2016, 01:22 PM	#3
SaltyNC Captain 370 Rep 870 Posts Drives: 2006 BMW Z4M Roadster Join Date: Oct 2015 Location: NC iTrader: (2) Garage List 2006 BMW Z4M Roadst ... [0.00]	Could be the water pump isn't performing well and isn't circulating the water through the heater coil very well (nor circulating cool water to the engine). It may be flowing but very poorly. But #2 -- hmm. Salty __________________ 2006 BMW Z4M Interlagos Blue/Black Aux Port\|LED Interior\|LED Strip Trunk\|Underseat First Aid Box\|Stubby Antenna\|Intravee II\|BMW Oil Change Kit\|Top Down Side Panels\|Vibra Technics Engine Mounts\|Rogue Trans Mounts\|Engine Mount Bolts Upgrade\|RS Windblocker\|Euro Front Plate\|M5 Illum Shift Knob\|Supersprint Powerloop Exhaust\|Gruppe-M Intake\|RPI Scoop\|Black Grills\|19x8.5 ET35 F 19x9.5 ET22 R Sportline 8s PSS\| Besian Vanos\|CDV Delete
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03-04-2016, 01:24 PM	#4
inTgr8r Lieutenant General 2426 Rep 11,667 Posts Drives: M2 Comp Join Date: Mar 2006 Location: Toronto iTrader: (10)	^agreed. & With that mileage the cooling system should be updated if still original __________________ '21 M2C Hockenheim Silver '18 718 Cayman S Lava Orange (sold) '13 E92 M3 Santorini Blue (sold) '07 Z4 M Coupe Alpine White (sold)
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03-04-2016, 03:19 PM	#6
Steeler Colonel 2428 Rep 2,702 Posts Drives: Built not Bought 04 Z4 VF Join Date: Feb 2013 Location: Kitchener Ontario Canada iTrader: (2)	Air lock? __________________ W2A Intercooled Vortech V3Si, custom ducting, Alpha N, 60# Bosch,2.62 pulley, multi port WMI, Severn Tuning(pokeybritches), Tial, magnaflow,SS race muffler, 42 design,3.91LSD, H&R, Hotchkis,ST coils,Konis, Megan camber arms, AKG SS, Nylon mounts, Poly bushings, Carbon interior, CF Aero.APEX
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03-04-2016, 08:44 PM	#7
GuidoK #buildnotbought 10626 Rep 4,848 Posts Drives: Z4 3.0i ESS TS2+ Join Date: Jul 2012 Location: Tinkering in the garage iTrader: (0)	I know the thermostat is partly controlled by the ecu. For that it needs temp sensors. There's one in the hose, but I think there's also one in the block (cylinder head). Replacing (or checking) the waterpump is definately a good idea. But it's strange that you hadn't had the problems for 6 months, and now that it's cold you get these strange symptoms again. Interesting problem. I dont know if the waterpump is also ecu controlled or that it's always on, but to me it sounds like either both waterpump and thermostat (so open (broken) thermostat prevents the engine to heat up quickly and the broken waterpump prevents enough flow that results in overheating), or a temp sensor and thermostat (thermostat still stuck open and inaccurate temp sensor prevents accurate waterpump control). Or that air lock (but after 6 months?) And what do you mean with the " and the small engine fan starts to run"? I thought it only had one fan on the radiator and it's quite large? __________________ Z4 3.0i \| ESS TS2+ supercharger \| Quaife ATB LSD \| Brembo/BMW performance BBK front/rear \| Schrick FI cams \| Schmiedmann headers+cats \| Powerflex/strongflex PU bushings \| Vibra-technics engine mounts \| H&R anti rollbars \| KW V3 coilovers/KW camber plates \| Sachs race engineering clutch \| tons of custom sh#t
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03-07-2016, 12:53 PM	#8
Z4 Coupe New Member 1 Rep 26 Posts Drives: E86 Coupe Join Date: May 2015 Location: Toronto, Canada iTrader: (0)	I believe there are 2 fans...there maybe a smaller fan close to the bigger fan. It sound like a fan..and is also present for approx 5 seconds after the car is off __________________ E86 -Tint, LED's, Front Clear Corners, Rear Red Turn Signals, Proclip, ZHP Shift Knob, Sebring Exhaust "Friends Don't Let Friends Drive Stock"
	Appreciate 0 Quote

03-07-2016, 03:20 PM	#9
Z4 Coupe New Member 1 Rep 26 Posts Drives: E86 Coupe Join Date: May 2015 Location: Toronto, Canada iTrader: (0)	I'm looking at replacing the following parts. Can someone give me some feedback if these are good reliable brands? I don't track my car. Just street use...thanks PART #: A0340B \| OEM #: 11517586925 : Electric Water Pump, PIERBURG : $505.00 PART #: B0340B \| OEM #: 11510392553 : Aluminum Bolts for Water Pump : $10.00 PART #: 11626B \| OEM #: 34116779652 : Ceramic Front Brake Pad Set, BREMBO: $99.00 / set PART #: 70286B \| OEM #: 34357836795 : Front Brake Wear Sensor, OEM: $15.00 PART #: 31271B \| OEM #: 11287628651 : Serpentine Belt, CONTITECH : $30.00 PART #: 4011B \| OEM #: 13621433077 : Temperature Sensor, OEM : $30.00 __________________ E86 -Tint, LED's, Front Clear Corners, Rear Red Turn Signals, Proclip, ZHP Shift Knob, Sebring Exhaust "Friends Don't Let Friends Drive Stock"
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03-07-2016, 04:34 PM	#10
Daemonblitz Commander 219 Rep 850 Posts Drives: Z4MC/M5/640iX/M1000RR Join Date: Nov 2010 Location: Aurora, ON, Canada iTrader: (6) Garage List 2008 BMW M5 [9.50] 2006 Z4M Coupe [8.77] 2010 BMW S1000RR [10.00]	Are you sourcing these from Worldpac by chance ? Only thing I have used myself the belt itself, my E46 has it and no issues, honestly, for daily driving I think these will serve you just fine. That water pump is not much different from what an OEM one at package price is at the dealer too. __________________ E86 ///M Coupe - Imola Red/Imola Red E60 ///M5 - (6 Speed) Silverstone Metallic/Black F06 640iX - Tanzanite Blue/Amaro Brown K66 ///M1000RR - Competition
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04-20-2016, 10:33 AM	#14
Z4 Coupe New Member 1 Rep 26 Posts Drives: E86 Coupe Join Date: May 2015 Location: Toronto, Canada iTrader: (0)	Thanks for your help all. My INDY scanned for codes and it was a water pump failure. Although there was no check engine light, there still was a code when scanned. Ended up replacing: water pump, lower rad hose & sensor, Serpentine belt, brakes, coolant. New owner should be happy __________________ E86 -Tint, LED's, Front Clear Corners, Rear Red Turn Signals, Proclip, ZHP Shift Knob, Sebring Exhaust "Friends Don't Let Friends Drive Stock"
	Appreciate 0 Quote

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