Cooling fans

[OutlawFlat4]

Hi all

My 4.2 has had the cooling mod and the fans kick in around 75, or so I thought, but actually when checking only the drivers on kicks in. I tried to get the car up to a higher temp (car was on axles stands trying to fix exhaust rattles) but it wouldn't go much higher before I had to put it back in the garage.

Would the other rad (which looks like it has bigger fins) kick in at a higher temp or is something broken?

If it is broken, what is the first thing I should look for?

Thanks in advance.

J

[ukkid35]

The larger fan should come on first, and the thinner fan second. I would suspect the connector near the fan itself before considering the fan controller. I think they're on separate fuses too.

Edited by ukkid35 on Sunday 31st August 21:26

[jammy_basturd]

On mine the second fan (think it is the nearside fan) comes on only at about 100/105 degrees on the gauge (which I imagine is actually about 95-100 degrees).

[N1CERB]

My 4.2 had only one fan, but two sets of wires. I updated to twin fans of equal larger size and got the cooling update from Joolz. When i tested both wire sets they seemed to both be on at the same temp. For peace of mind I just have both fans come on together to avoid the car getting upto any high temps. Or at least it trys!

[tejr]

As suggested check the connector by the fans themselves. The issue seems common, just coat them liberally with grease/vaseline or something to protect them.

I had the same issue, only one fan was kicking in and I had to clean up the connector and it was fine after that. The temperature would cycle up and down, but the peak temperature eventually got higher and higher until the primary fan stayed on constantly the the coolant temp just crept up really slowly until the engine was switched off.

There was a way to test the fans by unplugging a sensor somewhere to force both fans on but I can't remember which.

If at least one fan is coming on, it should be an easy fix where water has just corroded the connector.

[OutlawFlat4]

Thanks all, will check the connectors and go from there.....

[OutlawFlat4]

So I have finally got around to changing the dead fan on the cerb and after removing the airbox and F1 panel, I stupidly assumed that removing the 2x bolts on the top of the fan cowling would allow me to pull the fan out, but it seems not.

Do I really have to drain down the system and remove the rad to replace the fan, or is there sneaky way to remove it that I don't know?

Edited by OutlawFlat4 on Friday 31st October 18:49

Edited by OutlawFlat4 on Friday 31st October 18:55

[LincsCerb]

On mine the fans are fastened to the cowling with 4 nuts/bolts with a bit of a struggle I can manage to loosen them and then rotate the fan slightly as the holes for the bolts are slotted, then remove the fan. Hope that makes sense.

[OutlawFlat4]

Great! I was trying to remove the fan with it still on the cowling. Will go and have a crack at taking the fan off the cowling.

Thanks!

[Mr Cerbera]

Hi James

Just a quick point: My 4.5 never went over 75 degrees unless it was stuck in traffic.
Turned out that the Thermostat was jammed open.

Had a new Thermo fitted with Joo's Cool Chip and the first fan comes on at 82°C regular as clockwork.