Coolant systm

Asked by May 29, 2017 at 01:10 PM about the 2008 BMW 5 Series 528xi Sedan AWD

Question type: Maintenance & Repair

Y does my fan and water pump work whn thy want

2 Answers


In BMW E60 models with NG6 (N52 or N54) 6-cylinder engine, cooling system components consist of the following: Radiator and coolant overflow tank. Electric coolant pump bolted to the right front of the engine block. Electric cooling fan attached to rear of radiator. The cooling fan is controlled by the engine control module (ECM) via an output final stage. Electronically controlled thermostat. Automatic transmission cooler (heat exchanger). Heater valve and heater core (for climate control). Coolant level sensor inside expansion tank. Coolant temperature sensor at cylinder head. Radiator outlet temperature sensor Coolant hoses and lines. Using an electric pump (as opposed to the engine-belt-driven variety) helps engine cooling efficiency and longevity as the pump can operate regardless of whether the engine is running or not and also regardless of engine rpm. For example, a low rate of coolant flow is maintained during cold start situations to help the engine warm up rapidly, while a high flow rate can be used for rapid cool-down, such as when the engine is shut off. The electric coolant pump is controlled by the engine control module (ECM). Engine load, temperature, operating range and other factors are used by the engine management system (DME) to determine coolant pump operation and speed. The pump also has self-diagnostic capabilities. Fault codes for the following conditions are stored in the ECM and can be used for diagnosis: Pump impeller speed deviation. Pump shaft stiffness or obstruction by foreign object. Incorrect water / coolant mixture. Air the cooling system. When a coolant pump begins to fail, you'll notice that the car tends to overheat at low engine speed, such as sitting at a stoplight. When you accelerate, the engine temperature will drop. Now, this is not always indicative of a coolant pump failure, but a good starting point. You may also want to try squeezing the top radiator hose with the engine warmed up and running. You should feel pressure build up on the back of the hose and surge once it is released. If you feel no pressure, it's a fair bet that the coolant pump is failing. The most common problem with the electric coolant pumps is a fault code for coolant pump volume. If you remove the water pump from your E60 and plan on reinstalling it, store it with coolant inside it. Otherwise, it will corrode and fail shortly after reinstalling it. Always replace aluminum fasteners each time they are removed and never reinstall a questionable coolant hose. The ECM also controls and monitors operation of the thermostat. Controlling the thermostat function according to a map allows the engine management system (DME) to raise engine operating temperature quickly and precisely to the optimal range and to maintain it there for maximum efficiency and minimum emissions. If a fault occurs in the thermostat, a fault code is stored in the ECM, usually with a description of "Map cooling circuit". A fault code can be present, yet the vehicle will lack any cooling system issues, such as overheating. This is because the thermostat has a fail-safe mechanical function as well. If you have this fault code, replace your thermostat and bleed your cooling system. Other symptoms of a faulty thermostat are engine overheating, slow to warm up and lack of heat. The thermostat is integrated with the thermostat housing; the two are replaced as a unit. This can be a tough part to change, as it is tucked away and behind many components. I like to remove the cooling fan when I have to replace a thermostat. It adds time to the job, but makes it a lot easier. Since you have an all wheel drive E60 and with active steering, you're going to have to remove the cooling fan anyway. So the bottom line is that u have an ultra modern cooling system

The only fan module in trunk I did not change the fan turn on high it does not get hot what could it be on a 2008bmw E60 email to help me it my cousin car please help please.

Your Answer

BMW 5 Series Experts

  • #1
    Tom Demyan
  • #2
    Michael Branan
  • #3
    Robert Charlson
View All

Related Models For Sale

Used BMW 3 Series
123 Great Deals out of 2,093 listings starting at $3,395
Used BMW 7 Series
3 Great Deals out of 169 listings starting at $5,995
Used Mercedes-Benz E-Class
40 Great Deals out of 674 listings starting at $4,500
Used BMW X5
24 Great Deals out of 1,074 listings starting at $4,500
Used BMW 6 Series
6 Great Deals out of 117 listings starting at $12,777
Used Mercedes-Benz C-Class
138 Great Deals out of 1,728 listings starting at $3,988
Used BMW M5
31 listings starting at $19,489
Used Audi A6
8 Great Deals out of 179 listings starting at $4,999
Used Mercedes-Benz S-Class
6 Great Deals out of 155 listings starting at $6,777
Used BMW M3
72 listings starting at $17,950
Used Honda Accord
51 Great Deals out of 1,254 listings starting at $1,350
Used Audi A4
39 Great Deals out of 673 listings starting at $2,900
Used Mercedes-Benz CLS-Class
11 Great Deals out of 143 listings starting at $9,990
Used Dodge Charger
58 Great Deals out of 770 listings starting at $4,495

Used Cars For Sale

2018 BMW 5 Series For Sale
225 listings starting at $63,473
2017 BMW 5 Series For Sale
9 Great Deals out of 35 listings starting at $49,500
2016 BMW 5 Series For Sale
5 Great Deals out of 27 listings starting at $36,595
2015 BMW 5 Series For Sale
19 listings starting at $26,910
2014 BMW 5 Series For Sale
49 listings starting at $25,495

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.