Radiator Fan - 1 fault or 2, 1 speed or 2? - Alfa Romeo Forum
You are currently unregistered, register for more features.    
Thread Tools Search this Thread
(Post Link) post #1 of 2 Old 03-06-13 Thread Starter
Status: -
AO Member
Join Date: Feb 2007
Location: United Kingdom
County: Greater Manchester
Posts: 24

Member car:

Alfa 156

Radiator Fan - 1 fault or 2, 1 speed or 2?

I have a 2001 156 2.0 TS CF3 sportwagon, recently it's been running hot, so I've checked out the fan resistor, and discovered a dry joint between the resistor coil, and the mounting bracket, so sometimes I got a good resistance reading, and at other times an open circuit. Can't re-solder the joint, as the coil ends are stainless steel.

I ordered a used replacement from Autolusso, and it's arrived, but the resistance rating is only 0.18 ohms compared with 0.3 ohms on the original. Will this make any significant difference?

Also, whilst checking fuses and testing relays during the fault diagnosis, I also noticed that in my engine bay fuse box, according to the manual, there are supposed to be 2 fan fuses in positions 6 (50A) and 7 (30A), but position 7 on my box does not have any wiring attached to it, even though the 30A fuse was present.

Has there been a change of design, or is the 2nd one only for V6 engines, and the manual covers both?

On the TS are both fan speeds now run off a single 50A fuse but via 2 relays? In the relay box there are 2 fan relays, but only 1 is 50A rated. How is the switching between fan speeds achieved? or does the TS really only have a single speed fan? Is the resistor actually a thermistor, if not what does it actually do?

When using Multiecudiag I also get a failure when attempting to actuate the 2nd fan speed. Is this also v6 specific? I'm confused, as I don't know if I have 1 fault ( the resistor) or another fault affecting the 2nd speed.

Any help / advice much appreciated as usual.

WorsleyBaz is offline  
Sponsored Links
Status: -
AO Platinum Member
David C's Avatar
Join Date: Aug 2003
Location: London, England
Posts: 28,993
The 50A relay is for the fan at full speed
The smaller relay is for the fan at low speed and has the resistor in the circuit to lower the speed.

A smaller value resistor will mean the fan will run faster than it did with its original resistor.

TS without A/C may only have a single speed fan.
David C is offline  

Go Back   Alfa Romeo Forum > Supported Alfa Romeo Models > Technical & Vehicle Assistance > Alfa 147, 156 & GT

fan , fault , radiator , resistor , speed

Thread Tools Search this Thread
Show Printable Version Show Printable Version
Email this Page Email this Page
Search this Thread:

Advanced Search

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

For the best viewing experience please update your browser to Google Chrome