Fan switch 0/1 - No heat in the car from Eberspraecher

[andreasd083]

Hi! I'm using an Eberspraecher heater on my 300, mk7, 2007. However the motor gets warm but almost no heat inside the car. Tha fan operates at a very low speed.

According to my local shop, there is a base speed on the fan so it never stops. So when I set it to 0 is blows slowly, but it is thesame speed if I turn it to 1. 2 and 3 are faster though.

When starting the Eberpraecher it uses the same speed as 0. As for the manual it should be set at 1 with recirculation, but the speed doesn't change even if i set it higher. Is there anyone who can check the speed of your fan and tell me i your act thesame?

I have checked the resistor, wich was ok.

I would like the fan to operate faster when the Ebersracher runs. Any thoughts?

[Airthies]

What model eberspacher do you have and what control unit?
Have you checked in-line fuel filter for eberspacher? If it doesn't get enough fuel it could cause it to idle rather than fully firing.
P's I'm guessing it's an air heater?

[andreasd083]

What model eberspacher do you have and what control unit?
Have you checked in-line fuel filter for eberspacher? If it doesn't get enough fuel it could cause it to idle rather than fully firing.
P's I'm guessing it's an air heater?

Eberspaecher/Eberspächer D5WSC. Water heater, wich also starts the ordinary blower. Motor gets hot, 60-70C so heater works fine.

[Airthies]

Ah right.
Silly question but does the cab heater work ok once your driving?
Or
Is it just that the blower fan in the cab is not blowing hard enough when the eberspacher Is on its heating cycle?

[andreasd083]

The fan is not blowing hard enough on setting 1. The speed of the fan is the same with the motor running or off.

It heats up well, but I have to use step 2.

[Airthies]

The fan is not blowing hard enough on setting 1. The speed of the fan is the same with the motor running or off.

It heats up well, but I have to use step 2.

Depending on how it's been wired up....
(According to the eberspacher wiring diagram, It should have a relay switched power supply into the fan switch, so you can select what speed the fan runs at while the eberspacher Is running.

But have seen them on various machines, some wired into the fan switch output, which will only let the fan run at one speed no matter what setting the switch is on.

Or even wired direct to the fan through a separate resistor, giving a set speed possibly different from any normal fan speed).

But the blower fan of the van is controlled slightly different from the eberspacher diagram. So it would need slightly different positive /negative connection setup.
How good are you with wiring diagram?
https://www.google.nl/url?q=http://butl ... eEw0IfRIMQ
Page 42 & 43

Is it factory fit?
or
Retro fitted (as I've been assuming)?

[andreasd083]

It is factory fit. It is a standard D5wsc, except for the control chip which is a Ford chip. It can be replaced with a standard D5wsc if you move the chip to a new heater. The wiring is also made by Ford at factory, which makes it a bit tricky to read from Eberpaecher diagrams.

The fan runs on one speed no matter what speed I choose.

As the speed is the same if it is 0 our 1 I think it might be a fan problem. There is no difference in how hard the fan blows. Is this normal?

Thank you for your assistance btw

[Airthies]

Normally (on any machines I've dealt with) fan speeds are set to "low" when diesel heater is running regardless of normal fan speed position. (To limit battery drain).
If your wanting to have fan running faster then I think it would need a bit of modification of the wiring harness.

[Airthies]

Can you confirm either:
fan works as normal when diesel heater is NOT on?

With diesel heater ON, fan only runs at speed 1 regardless of switch position?

[andreasd083]

Can you confirm either:
fan works as normal when diesel heater is NOT on?

With diesel heater ON, fan only runs at speed 1 regardless of switch position?

Ignition on - Fan runs on 0, 1 is the same as 0, 2 and 3 blows harder. I think it might be a problem with speed 1 as this probably should be harder than 0.

When heater runs and ignition off, it runs on speed 0 no matter of switch position.

[Airthies]

Can you confirm either:
fan works as normal when diesel heater is NOT on?

With diesel heater ON, fan only runs at speed 1 regardless of switch position?

Ignition on - Fan runs on 0, 1 is the same as 0, 2 and 3 blows harder. I think it might be a problem with speed 1 as this probably should be harder than 0.

When heater runs and ignition off, it runs on speed 0 no matter of switch position.

Fan should be off at position 0.

Fan switch 0 will be overridden when heater is on.

Could just be fan switch then not turning off between 0 & 1?
Or
a fault with the relay that con Possibly trols fan operation (when diesel heater is on) staying closed when heater is off. (As this overrides switch 0 position).

[andreasd083]

Sorry for this bump, but I thought I'll update it with a solution if anyone has the same problem.

I talked with a Ford mechanic specialized in Transit and he told me there are two more green relays above the fan resistor, quite high up. After pulling them out (real hell) i accidentally ripped one out of its housing. Still worked when I pushed it back in BUT after that it works as a normal fan, 0 - off, 1 - slow, 2 - medium, 3 - fast. Green relay hade jammed somehow. Still step 1 is still too slow to heat the coupé though. The mechanic advised to fasten the green relays somewhere where they are easy accessible in case they might brake.

Also I got a tip from someone, probably in here, on a solution to change the eberspacher fan sped to medium (2) by switching the cables, step 1 switch and step 1 on resistor to step 2 switch and step 2 resistor as the heaters signal connect to cable 1. Attaching picture. I have not tried this though as I almost always use an electric heater now and last years winter where so mild.

Another tip is if you would like to turn of the eber from starting automatically you can unplug the eber temp sensor just behind it. Little round sensor in metal. You can still start the eber manually with the timer, however it vill not start if you s a set a time as it thinks its varm weather (above 5C). For easy switching between auto and manual I would recommend cutting the wire to the sensor and installing a switch inside ta car. For troubleshooting you could also bridge the pins as this makes the eber thinks its cold outside. I however have had no problems with the heater itself but the water pump as I replaced for an original Eber for half the price Ford was asking for it.

[andreasd083]

I switched these cables, hovever the circled connection is very close to the resistor, so its easier to move it than changing pins.

But the speed on the fan then went 0 - medium, 1 - medium 2- medium, 3 -high.

Pulled the relay and it worked as normal again. Problem is likely in one of the relays. Is i t possible to test them somewhow? Replace with a standard? Ford original is expensive.

Could a broken relay also stop ac from engaging? Ac doesn't work anymore, signal goes to magnet clutch but it doesnt open