Radiator Electric Fan

[nemohm]

Seems to me my radiator fan (V7) is toasted.

Anybody having an extra one for sale?

How long does it take to get it replaced?
(A6, C5).

Are there other options?

[nemohm]

Re: Radiator Electric Fan

Are there any DTC that VAG-Com can detect?
Any tests to be done?

[stefan]

Re: Radiator Electric Fan

you can for sure simulate overheat to force the fan on. Rules out sensors I guess. Should be able to make sure temp sensors are reading realistic values too.

[nemohm]

Re: Radiator Electric Fan

Simulating overheating?

-Drain the coolant and drive?

-Place a large cardboard in front of the radiator?

Any VAG-com tests that could do the job?

[stefan]

Re: Radiator Electric Fan

thats what I mean. its a VAG-COM test. It just turns fans on really. You could drain your coolant and go for a rip, but that won't rule out a faulty sensor (jk... of course)

[nemohm]

Re: Radiator Electric Fan

VAG-com:
Engine- Output tests - Sequential tests?
Is that what you mean or else?

[stefan]

Re: Radiator Electric Fan

i can't remember exactly. That sounds right. Sorry, i'm far from a pro with a VAG-COM. It is a series of tests for sure. There are a bunch of instrument tests that it steps trough where the gauges go from min to max, and all the digital stuff goes to 8's, then the various cluster lights come on, and a few other tests, and one of them is an overheat test and the fans come on.

*looking at their demo online, ya, It should be the output tests under the instruments section. Looks like you can do all, or just select the fan test. It used to use 'overheat' as part of the description for that test, I don't think it does anymore. But the fan stuff is there for sure.

http://www.ross-tech.com/vcds/tour/out_test.html#top

[nemohm]

Re: Radiator Electric Fan

Replaced the fan for second time. First (new) fan was faulty (tight bearings).

Observation with VAG-com connected:

1. Temperature gauge is steady at the middle (90C) - like a rock.
2. The fan is on at 105C **-0ff at 102C (Bentley states - 92C for the fan to kick on (first stage). Must be triggered by the radiator- fan- thermo -switch.

Is somehow that the signal from CTS to the gauge gets distorted?
Could it be that the gauge is faulty?
CTS faulty?
Does the gauge get a signal from CTS only or the radiator thermo switch is involved as well?

[VWSM]

Re: Radiator Electric Fan

Simulating overheating?

-Drain the coolant and drive?

-Place a large cardboard in front of the radiator?

Any VAG-com tests that could do the job?

Don't drive the car with no coolant.
You need coolant to transfer the heat to the sensor.
Maybe fan control module?
They are dummy gauges set to always stay at 90 degrees unless overheating.
110 is still normal.
Is the fan turning on and at what speed.
Possible the resistor as well or faulty waterpump.

[J-hop]

Re: Radiator Electric Fan

hahahahhaa, I think that had to be joke, that wouldn't be considered "simulating" an overheat... that would actually be overheating the engine. That is like saying, "lets 'simulate' pain in your foot, hand me that hammer". But yea as stated above you couldn't even get the coolant temp sensor to register much temperature if the coolant was drained, air is a great insulator!

What stefan meant is that with VAG you can send a signal that would simulate the voltage(?) output of the coolant/fan sensor during an overheat situation, I don't know vag com very well but I assume you would just have to figure out what the voltage to temperature conversion is, I used similar technique for calibrating coolant sensors with megasquirt.