GQ Thermo fan?
Submitted: Saturday, Oct 06, 2007 at 08:45
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andrewv
I know we have discussed this subject before but since its been such along time I wonder if anyone has had any success with them in a TD42 after market tuboed patrol.
I successfully drilled and tapped a plug into my viscous fan assy and added more silicon oil into it and yes it did help with cooling the engine down on long climbs but since the load on the engine is increased in turning the fan around fuel economy and power is down a bit.
I was thinking that two thermo fans in place of the viscous fan along with either replacing the air con fan with a larger one or to run an extra one beside it would be a better alternative.
All would be hooked up via a thermostat and controlled by a 3 way switch that can either switch to Auto/Manual/Off.
I know this is going to be a load on my charging system but I will have to do some calculations as to whether its too much
The vehicle very rarely goes into
water and is just used for towing primarily so I see
water crossing not to be an issue.
regards to all Andy
Reply By: Member - Olcoolone (S.A) - Saturday, Oct 06, 2007 at 19:04
Saturday, Oct 06, 2007 at 19:04
Hello Andy, viscous fans are designed to opperate upto a maxium speed of about 3500 rpm befor the start sliping [ the rpm if fan speed not engine].
It is better to fit one large electric fan the two or more smaller ones if you can get the air flow, the reason being is where the fan motor and the casing is there is no air movement causing a restiction in air flow and maybe a hotspot.
If you are having problems with the viscous fan coolong the engine I don't think going to an electric fan will helpas the viscous fan will pull more air then an electric one.
If you go electric it is better to mount the fan infront of the radiator then behind, so you need a pusher fan.
I would even look at going to a higher temp thermostat, if your GQ uses a 86 deg. one try a 88 or 90 deg one.
Regards Richard
AnswerID:
265330
Follow Up By: andrewv - Sunday, Oct 07, 2007 at 07:50
Sunday, Oct 07, 2007 at 07:50
Thanks richard ,You mentioned a higher temp thermostat?.Correct me if I am wrong but using a higher temp one wouldnt that make the engine run hotter?
Regards Andy
FollowupID:
527312
Follow Up By: Member - Olcoolone (S.A) - Sunday, Oct 07, 2007 at 08:45
Sunday, Oct 07, 2007 at 08:45
We get alot of people say the same thing about thermostats at work.
By going to a higher rated thermostat you are keeping the coolant in the radiator longer and cooling the coolant to a lower temp before the thermostat opens.
When the coolant enters the engine it has the ability to remove more heat from the engine quicker and more efficently lowering the engine temp.
A cooling system is a open close design where the thermosts controls the flow in and out the radiator.
Some people remove the thermosts altogether and the engine runs to cold but on a hot day you will find the engine will overheat by the coolant becoming saturated with heat and the heat just keeps building until it boils.
So the longer the coolant can be kept in the radiator to within reason the better.
You may want to look at a good oil cooler instead of more fans, above 50kp/h engine fans do very little.
Or get a bigger radiator and do it properly.
Regards Richard
FollowupID:
527319
Follow Up By: G.T. - Monday, Oct 08, 2007 at 17:05
Monday, Oct 08, 2007 at 17:05
A thermostat opens at i t`s set temperature say 82 degrees centigrade. When it opens it lets the
water out of the block into the radiator to be cooled. The way you are describing the action of a thermostat is incorrect , the thermostat does not keep the
water longer in the radiator,it keeps the
water in the block so as to facilitate a quicker warm upand then opens. It will close when the temperature drops below i t`s setting. Regards G.T.
FollowupID:
527551
Follow Up By: andrewv - Wednesday, Oct 10, 2007 at 16:05
Wednesday, Oct 10, 2007 at 16:05
Hey Richard Im interested in your theory about installing a higher temp thermostat into my GQ patrol Turboed Diesel.It sounds plausible and was wondering if you have ever seen one done?
You also mention (that you hear alot of people say the same thing about thermostats at work).Excuse me in asking but what sort of experience do you have in saying that?
Regards andy
FollowupID:
527942
Reply By: Shaker - Saturday, Oct 06, 2007 at 20:09
Saturday, Oct 06, 2007 at 20:09
Could you fit a manual overide switch for the air cond fan, so that it will run with the air cond off?
AnswerID:
265338
Follow Up By: andrewv - Sunday, Oct 07, 2007 at 07:55
Sunday, Oct 07, 2007 at 07:55
Perhaps I could mount another thermo fan in front of the radiator alongside the existing Air con fan and YES hook it up via a switch so I can manually turn them both on when needed.Of course allowing the fans to run in an auto function when using the air con.
Regards andy
FollowupID:
527313
Reply By: Danny & June - Sunday, Oct 07, 2007 at 22:14
Sunday, Oct 07, 2007 at 22:14
Electric fans did not work for me.
GQ petrol did overheat with load and 4 fans did not keep it cool.
Original fan fixed all overheating problems.
I only fitted elect fans because I had them,Paid for new fan blades (reluctantly) . It worked.
AnswerID:
265499