Aircon fan mod p38

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P38dse1998

Member
Posts
77
Location
Dalgety bay, Scotland, uk
Hi all, can someone share the details for the aircon fan mod on a p38.

Been running around without a viscous fan for months, now time to tow the caravan so, either a new viscous or do this mod.

Oh and I've messaged datatek asking for the info.

Thanks
 
P38dse1998 said:
Hi all, can someone share the details for the aircon fan mod on a p38.

Been running around without a viscous fan for months, now time to tow the caravan so, either a new viscous or do this mod.

Oh and I've messaged datatek asking for the info.

Thanks
Click to expand...

If you are towing a caravan put the viscous fan back on.
 
P38dse1998 said:
Or install electric fan on rad?

Also the aircon fans not enough for complete cooling of cooling system?
Click to expand...

Not when you are using aircon they aren't, as i said put the viscous fan back on. An electric fan fitted to back of radiator only draws air through a restricted area. The vicous fan draws air through the whole rad area because of the shroud. Later models (1999 on) have a black temp sensor on the head that brings on the aircon fans to assist the viscous in cooling if a certain over temp is reached. This helps when sitting in traffic after heavy load conditions to remove latent heat at low engine RPMs with no dynamic airflow through the rad. Blowing hot air from the aircon condenser through the rad with the engine under load towing a caravan in summer without assistance from the viscous and expecting it to cool the system is a rather fanciful thought. Others may disagree but those are my thought on the matter.
 
P38dse1998 said:
Or install electric fan on rad?

Also the aircon fans not enough for complete cooling of cooling system?
Click to expand...
The aircon fans cope very well if the cooling system etc is good order. I have been running for some years now without a viscous fan, even in temperatures of 38C arcon on, 3 up with luggage crawling up hill there was no problem. Likewise I have done some heavy towing, a P38 on a trailer, mid twenties C on the hilly twisties through France, no problem.
 
Datatek said:
The aircon fans cope very well if the cooling system etc is good order. I have been running for some years now without a viscous fan, even in temperatures of 38C arcon on, 3 up with luggage crawling up hill there was no problem. Likewise I have done some heavy towing, a P38 on a trailer, mid twenties C on the hilly twisties through France, no problem.
Click to expand...

I did say others may disagree Keith.;):D
 
wammers said:
Not when you are using aircon they aren't, as i said put the viscous fan back on. An electric fan fitted to back of radiator only draws air through a restricted area. The vicous fan draws air through the whole rad area because of the shroud. Later models (1999 on) have a black temp sensor on the head that brings on the aircon fans to assist the viscous in cooling if a certain over temp is reached. This helps when sitting in traffic after heavy load conditions to remove latent heat at low engine RPMs with no dynamic airflow through the rad. Blowing hot air from the aircon condenser through the rad with the engine under load towing a caravan in summer without assistance from the viscous and expecting it to cool the system is a rather fanciful thought. Others may disagree but those are my thought on the matter.
Click to expand...
No different to the viscous drawing hot air from the condenser through the RAD, the aircon fans rarely run normally, in fact the never ran on mine even though I use the aircon all the time because of a wiring fault.
With the cowl & viscous removed, there is enough airflow above about 30mph to need no fan.
 
Datatek said:
No different to the viscous drawing hot air from the condenser through the RAD, the aircon fans rarely run normally, in fact the never ran on mine even though I use the aircon all the time because of a wiring fault.
With the cowl & viscous removed, there is enough airflow above about 30mph to need no fan.
Click to expand...

Ok but i would not do it.;):D
 
I've your cooling system is up to scratch I can't see where the problem is but an electric fan on a separate switch seems to be the way to go I had an old 3300 daf years ago that had one fitted and every time I went up a long hill I had to rember to hit the switch but there was a problem with the cooling system
 
pete12345 said:
I've your cooling system is up to scratch I can't see where the problem is but an electric fan on a separate switch seems to be the way to go I had an old 3300 daf years ago that had one fitted and every time I went up a long hill I had to rember to hit the switch but there was a problem with the cooling system
Click to expand...
With a stat, you don't have to remember to hit a switch:)
 
This is a super mod'. I did it on my p38 as per Datatek advise....maybe 5-6 yrs ago.
All is fine...Sold it to a mate of mine and is still all fine.
A great and simple idea..
Cheers.
 
donp38 said:
This is a super mod'. I did it on my p38 as per Datatek advise....maybe 5-6 yrs ago.
All is fine...Sold it to a mate of mine and is still all fine.
A great and simple idea..
Cheers.
Click to expand...
Always good to have feedback thanks.
There is a guy in New Zealand where it can get pretty hot running a P38 with the 3 litre M57 engine. He also runs without a viscous fan, it was fine except for heavy towing. A radiator upgrade fixed that.
 
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