air con

L

landmark

Active Member

Posts

168

Location

Hampshire

• Mar 24, 2010

• #1

Hi, air con fan on the front of my td5 is running all the time even when climate panel is switched off. Is this normal?? If not any ideas were i can start to look for faults Cheers all

 

jonathanp

Active Member

Posts

183

Location

Barnard Castle, County Durham

• Mar 25, 2010

• #2

From memory no it is not normal , you either have a problem with a switch or relay in the air con circuit or possible your engine could be overheating ? I am not sure but I think there is another thermal switch in the cooling system that switches the fans on independantly if the water gets too hot . Is the fan running as soon as you switch the engine on after being parked all night or just after a few minutes driving ? Regards Jonathan

 

broadoakboy

New Member

Posts

116

Location

Weston-s-Mare

• Mar 25, 2010

• #3

Check the coolant level, mine was doing this, it's a fail safe if the engine gets too hot. To temporarily stop the AC fan running i've had to take the fuse out. Going to plug in a diagnostic tool to see if I can reset it. I'll let you know what happens

 

M

martinhollings

New Member

Posts

659

Location

newark/nottingham

• Mar 25, 2010

• #4

the air con fans will only run it the coolant temp goes above 106* it uses the same coolant temp sender and is controled buy the ecu

 

L

landmark

Active Member

Posts

168

Location

Hampshire

• Mar 25, 2010

• #5

With the engine stone cold, as soon as i start ,the fan comes on. Temp is all normal on dashboard and when i pull relay out of the engine bay fuse box the fan stops and then starts straight awayupon replacing it. . I have tried swaping the relays over but it make no difference, the fan just wants to run. What else gives it the command to run?????

 

Last edited: Mar 25, 2010

broadoakboy

New Member

Posts

116

Location

Weston-s-Mare

• Mar 26, 2010

• #6

As martinhollings says, your engine got too hot. Possibly an airlock in the sytem pushed the coolant out. You need to reset the ECU via a diagnostic tool, that will tell the AC fan/sensor the engine temp is ok.
Check your coolant level. Top it up if needed and run the engine with the reservoir cap off for a little bit.
If after doing that you still have problems, suspect a bigger issue.