Continuous Fan

Talk about the E-Type Series 3

Topic author
Bernie2015
Posts: 221
Joined: Fri Oct 16, 2015 4:30 pm
Location: Devon
Great Britain

#1 Continuous Fan

Post by Bernie2015 » Thu Jan 10, 2019 4:53 pm

Just taken delivery of a Series 3 and both radiator fans run continuously as soon as the ignition is turned on even before the engine starts. Is this normal?
I've never owned a Series 3 before and it doesn't happen on my Series 1. Any advice from Series 3 owners much appreciated.
Bernie 1966 S1 OTS

Link:
BBcode:
HTML:
Hide post links
Show post links


ManniB
Posts: 21
Joined: Sat Oct 17, 2015 9:01 am
Location: Pfaffenhofen/Germany
Germany

#2 Re: Continuous Fan

Post by ManniB » Thu Jan 10, 2019 5:02 pm

Hi Bernie,

not normal. PO has either bridged the otter switch (or OS is bad) or the AC radiator fan relay is continously on which again bridges the otter switch, makes the radiator fan relay which then runs the fans.

- Manfred
1972 E type 2+2 Willow Green

Link:
BBcode:
HTML:
Hide post links
Show post links


Topic author
Bernie2015
Posts: 221
Joined: Fri Oct 16, 2015 4:30 pm
Location: Devon
Great Britain

#3 Re: Continuous Fan

Post by Bernie2015 » Thu Jan 10, 2019 5:04 pm

Thank you Manfred I will look into it now I know its not normal - much appreciated
Bernie 1966 S1 OTS

Link:
BBcode:
HTML:
Hide post links
Show post links


Woly64
Posts: 24
Joined: Thu Jan 04, 2018 10:44 am
Location: Dorset
Great Britain

#4 Re: Continuous Fan

Post by Woly64 » Thu Jan 10, 2019 5:20 pm

Also check that a previous owner did not fit a manual override switch somewhere in the cabin as I have seen this done on many a Series 3
Martin

1971 Series 3 2+2
MTM RS6 Avant
A1 1.4
Polo 1.2S

Link:
BBcode:
HTML:
Hide post links
Show post links

User avatar

lowact
Posts: 138
Joined: Mon Oct 09, 2017 10:05 am
Location: Canberra, Australia
Contact:
Australia

#5 Re: Continuous Fan

Post by lowact » Sun Jan 13, 2019 1:51 am

The Otter Switch is in the bottom hose from the radiator to the water pump.
Image
In this location it senses the temperature of the water from the radiator, if it is too hot it turns on the fan. Per Manfred, if this switch has failed the PO (previous owner) may have bypassed it, e.g. by connecting the two switch wires together. This would cause the radiator fans to run continuously, whenever the ignition is on.
Regards,
ColinL
'72 OTS manual V12

Link:
BBcode:
HTML:
Hide post links
Show post links


Topic author
Bernie2015
Posts: 221
Joined: Fri Oct 16, 2015 4:30 pm
Location: Devon
Great Britain

#6 Re: Continuous Fan

Post by Bernie2015 » Sun Jan 13, 2019 8:34 am

Thats realy helpful thanks I will locate the switch
Bernie 1966 S1 OTS

Link:
BBcode:
HTML:
Hide post links
Show post links

Post Reply Previous topicNext topic