2004 VU Berlingo 1.4i (M59) Cooling Fan Issues

[myglaren]

Post your VIN so we can see just what is in your Berlingo, helps a lot with fault finding.

[GiveMeABreak]

Hi - well here is the parts diagram for your Berlingo, which may help identify the components for you:

(6) Is the Fan Relay Resistance (0.54 Ohms), Grey.
(7) are the 35A relays
(3) is the Fan Harness - note: ASSEMBLY 2 RELAYS 1 RESISTOR INSTEAD OF 3 RELAYS 2 RESISTORS.

I'll see if I can dig out the relevant wiring for you shortly.

[RichardW]

Welcome!

What sort of cooling issues.... the fact the fan has been forced to run full time suggests it is overheating - but this is unlikely to be the fan, given that it's running all the time! If it's overheating with the fan on, then either the stat is failed closed, the water pump is not working, there is a blockage somewhere, or the head gasket is toast (not exactly uncommon on this engine, although it usually just leaks oil).

[GiveMeABreak]

Here's the relevant bit for you:

Hardware
1506: Cooling fan 2-speed / resistance (3 Pin Grey Connector)
1509: Fast speed fan supply relay (5 Pin Black Connector)
1508: Slow speed fan supply relay (5 Pin Black Connector)
1510: Fan (2 Pin Grey Connector)
MC94: Earth

Wiring:
1514: Fan Control
M1510: EARTH m1510
1512A: Fan unit low/medium speed command
152: Fan assembly low speed control
1590: Fan unit relay power supply
1550: Fan control 2 (-)
BF1A / BF1B: Power form Maxi Fuse MF1
1540: Fan control 1 (-)
151: Fan assembly high speed control

Also, bear in mind the fan is usually on low speed if you have the air conditioning switched on.

[GiveMeABreak]

Here you go, note:

The mid speed of the three-speed cooling fan is used for the air conditioning. Mid speed is controlled by the BSI and depends on the pressure values of the pressostat:

• Pressostat pressure to engage the cooling fan: 16 bars
• Pressostat pressure to cut off the cooling fan: 13 bars

Click to Zoom

[GiveMeABreak]

As per your PM, here is the injection circuit. There is no pin 84 referenced - but that may just be because a lot of these are contained in one connector - but the 1540 wire goes to the engine ECU as you can see (I think they got the prefix code wrong where it starts 12** on the previous diagram), but goes to pin J4:

Anyway I hope this is what you need.

Bear in mind where there is a dashed line - e.g. going from the engine ECU (1320) down to 1504, you'll see this is also dashed and that is because the cooling systems and equipment can vary on htis configuration - so they show it as 15--.

[GiveMeABreak]

Not the best of diagrams - but as you can see top left of battery (1320):

Click to Zoom

[GiveMeABreak]

The table should answer your questions, but the post-cooling threshold for triggering the fan is 105 °C and can last up to 6 minutes.

Post ventilation
When stopping the engine, the engine ECU controls the post cooling (slow speed), if the measured engine coolant temperature is over a programmed level.

Description	Action	3-speed (*) All engine types with air conditioning
Cooling temperature warning threshold	Ignition system Switching off	118 °C 115 °C
Length of post cooling	-	360 s
Temperature threshold for triggering post-cooling	-	105 °C
Coolant temperature limit for low speed	Engagement Cut-off	97 °C 94 °C
Coolant temperature limit for high speed	Engagement Cut-off	105 °C 102 °C
Temperature for triggering of the cooling fan	-	97 °C

[GiveMeABreak]

The fan coming on when A/C is engaged is perfectly normal and expected behaviour. As for the Post cooling, I wouldn't get too hung up on it as there may be a slight discrepancy in the measuring of a degree or 2, but obviously if the temperature after engine off is well above the threshold of 105 °C, then I would be suspecting the water temperature sensor. If the fan is working at all 3 speeds, then there is nothing wrong with the ECU or the fan.

[GiveMeABreak]

So there are 2 water temp. sensors - the Green one in the water outlet housing and the blue one under the Cylinder head:

The part numbers I have are:

Coolant Outlet Tank Part: 9636777180 (M12X150 2 way) - Green

Under Cylinder Head Part: 024286 (14 X 1.25 118 °C) - BLUE

So the blue one is an 118 °C - which corresponds to my table in the previous post.

I can't vouch for aftermarket parts - but these are the OEM part numbers.

[GiveMeABreak]

Not really as the fan would be all or nothing if the resistor was at fault.

The thing is here is that there are 2 functions going on FRIC and BRAC (I know, I know, but it's not a kids TV show). FRIC is the cooling of the engine temperature controlled by the Injection ECU and BRAC is the cooling function of the Air Conditioning system , generally controlled by the BSI. So there can be 2 systems controlling the fans - A/C pressure and engine temp. There's too much to go into, but the blue one is obviously designed to kick out the warning at 118 °C