electrical problem, help needed pleae

[blue 464]

Hi, does anybody know of a method of allowing the kenlowe to run on after engine shut off for a timed period to allow some of the residual heat to clear? I was thinking some sort of timer delay relay may do it, but am not up on electronics to work out what sort to use. thanks for reading this and any help, Derek

[022Dave]

Hello Derek,

I have my Kenlowe running off a 'modern' thermostatic switch mounted direct into the radiator, but it is also coupled in with a Davies Craig electric water pump. The ewp has its own thermostatic switch, again on the radiator, but switches on about 5 degrees C before the fan to get the coolant circulating. The two switches shut off at about the same temperature. They are on a permanent live feed operating a couple of relays, so if I turn off the engine when they are running, they stay on until the coolant drops to the shut-off temperature.

Dave

[blue 464]

Dave, thanks for the reply, I use stagdads belt driven pump which of course stops with the engine, so there is no water circulation, I was looking to use the fan just to remove residual heat for 10 minutes or so after shut off which is why I was thinking of a time delay relay, Derek

[thebadleys]

I also have a Stagdad pump (2years plus, no issues) and I have my "auxiliary" fan wired direct to a fused supply from the battery, the control thermostat probe is in the top hose. This allows the fan to run when the engine is turned off and the residual temperature rises, this obviously doesn't circulate the coolant as an electric water pump would but it does cool the under bonnet temperature.

On a recent tour of Spain in the Stag, with temperatures up at 34c, when parking up after a run the and the temp gauge increased to about 3/4 the fan kicked in and ran for about 2 -3 minutes and the gauge reduced accordingly.

Not fool proof but a good back up that has worked for me.

Nigel

[blue 464]

Nigel, thanks for that, I had thought about it and will give it a try, Thanks again, Derek

[Phil S]

performance engines and many trucks use a device called a turbo timer. this allows the engine to run on for whatever time you set after the ignition is switched off to allow the turbo to spool down. it could easily be adapted to run your fan not the ignition.
Phil

[blue 464]

Phil, thanks, will try nigels suggestion first then consider alternatives, derek

[Seaking]

https://www.revotec.com/acatalog/Ele...ntrollers.html this is what I use

cheers Glenn

[Ritchie6]

At the risk of stating the "bleedin' obvious" my car has a Kenlowe on a manual switch fastened underneath the dash. To be honest I've never needed to use it as my car doesn't run hot. Do you still have the viscous fan attached? If so can't you simply put a similar manual switch onto your car? That way you could pop it on for a minute or so after parking up.


Richard

[blue 464]

Richard, I run without a viscous fan and have done for the past 6 years, The kenlowe is a 2 speed job controlled by a thermostat and manual switch for normal and the kenlowe "boost " switch for high speed. The temperature Gauge normally sits at around 80 degrees C. The fan only comes on if I sit in traffic. The radiator is a standard one which was rebuilt with a standard core by a local specialist 2 years ago, after the rebuild the temperature dropped by 5 degrees. However lately I have been having some hot starting problems and feel that removing some residual heat may help. I would like to run the fan for 5 -10 minutes after stopping and don`t want to wait around so was looking for a way to do it automatically, thanks for reading, Derek

[022Dave]

Hello Richard,

My Kenlowe draws about 25 amps at full chat, so I'd be careful about having it on for 5-10 minutes on the battery.

Dave

[Ritchie6]

Hello Richard,

My Kenlowe draws about 25 amps at full chat, so I'd be careful about having it on for 5-10 minutes on the battery.

Dave

Thanks for the warning Dave. As I said I'm fortunate that my car doesn't run hot and even during this summer's heatwave when we toured the Lake District the temp gauge never rose above 3/4 despite going over Hardknott pass which has 1:3 hairpin bends and very long steep climbs. When I bought the car last year I did switch it on to check it worked but that's it.


By the way Derek when I said about "stating the bleedin' obvious" I hope you realised I was paraphrasing Basil Fawlty and not being rude to you.

[Phil S]

just to add..my kenlow is wired through a temp switch in the top hose and a manual switch..both are relay fed direct from the battery and it's the relay earth that is switched. this way either the switch or temp sensor can switch the fan on with the ignition off. but it has not turned on even when used this summer..I have a TH supergill but that's all.
Phil

[KOY 23]

Richard, I run without a viscous fan and have done for the past 6 years, The kenlowe is a 2 speed job controlled by a thermostat and manual switch for normal and the kenlowe "boost " switch for high speed. The temperature Gauge normally sits at around 80 degrees C. The fan only comes on if I sit in traffic. The radiator is a standard one which was rebuilt with a standard core by a local specialist 2 years ago, after the rebuild the temperature dropped by 5 degrees. However lately I have been having some hot starting problems and feel that removing some residual heat may help. I would like to run the fan for 5 -10 minutes after stopping and don`t want to wait around so was looking for a way to do it automatically, thanks for reading, Derek

Why not refit the viscous fan as it will keep the temperature more constant and avoid the large temperature swings caused by only having an electric fan.

[thebadleys]

I also have a Stagdad pump (2years plus, no issues) and I have my "auxiliary" fan wired direct to a fused supply from the battery, the control thermostat probe is in the top hose. This allows the fan to run when the engine is turned off and the residual temperature rises, this obviously doesn't circulate the coolant as an electric water pump would but it does cool the under bonnet temperature.

On a recent tour of Spain in the Stag, with temperatures up at 34c, when parking up after a run the and the temp gauge increased to about 3/4 the fan kicked in and ran for about 2 -3 minutes and the gauge reduced accordingly.

Not fool proof but a good back up that has worked for me.

Nigel

I should have added that it is wired via a relay and I also have utilised the HRW switch to operate manually should it be required, the fan is a generic type as it is auxiliary to the standard viscous I don't know what amps it pulls but never had an issue with reduced battery power.

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