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HJ Kingswood thermo fan install

Picked up a 14 inch fan for the stock 202. Can I use the temp sender in the head to control it? Or do I need to buy a temp switch, which should have been in the bloody kit in the first place

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No. If the temp sender is for a light it will turn on too late, if it is for a guage then it is not a switch but a variable resistor. Look on eBay for a switch, doesn't matter what it is from but check the switching temps are what you need. For example Temp on and off .Then buy an adaptor to suit your thread in your head. You will also need to run it through a relay.

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If you have a temperature gauge I would just put a switch in or under the dash.
You can run power to the switch, then from the switch to the trigger terminal on a relay connected to the fan.
This way you can simply turn the fan on if it starts to get warmer than usual, rather than trying to cool it down when the motor is beginning to overheat.
David

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Old is good.

both of the above comments are solutions. I'd go for a temp switch that turns on at say 90 or 95 degrees.it will need to be plumbed into the head or thermostat housing..it could be via a T piece to where the temp gauge or temp warning light is connected but it needs to be separate..a gauge sender is not a switch and a temp light switch is set too high to activate a fan - eg 125 degrees..get a relay at the rated current for the fan..connect pin 85 to ignition 12v and pin 86 to the temp switch which will ground the primary of the relay when temp reaches 90 degrees or 95..connect pin 87 to the battery via an inline fuse and pin 30 to the fan positive and ground the fan -ve to the chassis.

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Andrew

I bet you have over heating problems once you take the mechanical fan off ive now put more orginal fans back on than cheap after market thermo fans watch your temp gauge wander up and down now.
I wouldn't bother its a boy racer mod whats 3 or 4 horses matter anyway?

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The root cause was greed

I have to respectfully disagree with this, while mechanical fans work good a well thought out electric fan set up is much more efficient. I have twin 14" thermos on my mild VN head 308 (~350-400hp) and at this time of year the fans only come on after idling for a while. Cruising down the freeway the fans don't come on because the airflow from moving is enough to keep the coolant temp down.

If you look at most modern cars they are fitted with electric fans. I'll bet on all of those cars you've put mechanical fans on they had a poorly thought out set up and/or other issues.

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Cheers
David

aka hq308belmont

My Archived Shed

your correct along with the 35 amp alternator on the hq sitting in stop start traffic the old stuff wasn't too good . in the 90's when I actually drove and worked on hqs the few hqs I worked on recently the blokes liked pretty much factory.
it will eat few dollars by the time a good set of thermos that work go on along with the controls.
http://www.tridon.co...
the fan switch from a sigma comes to mind about fitting in a holden head

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The root cause was greed

Personally I would still run an engine fan as well.
If you’re having overheating problems in stop start traffic, all I did whe I ran my 6cly in my HR Ute was I had an engine fan one of those 6 blades type and a 14” electric fan on a toggle switch, so I could control it when I need it. I was running triple su’s in Cairns’s Nth Qld
Modern cars run an alloy block and heads, the older 6s are cast.
A good radiator always helps or get the one you got flushed out

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"just my 2cents worth"

"were going to need a bigger shed"
trippled75@yahoo.com.au
This will take You to" Old Holden sheds"
https://web.archive....

all things being equal if you electric fan can draw the same or more airflow through the radiator it should be a suitable replacement..it may draw more air through at lower rpm eg stationary at lights and less at higher rpm..but then you should have decent air flow through the radiator...I've had a variety of cars using small fixed mech fans, large fixed mech fans, large fans with viscous couplings, electric fans in front of condensers modern cars with only electric fans...all have worked well and all have over heated when the radiator needed to be flushed or replaced with the exception of the viscous coupling fan...which can be tricky to know if they are working properly and one of the first things I would check with a car having one and overheating when idling...

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Andrew

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