Hamad89

Greetings everyone,

I've been researching lately on how to improve and update my 83 944 cooling system to handle the summer heat and traffic
I found out that the 6-blade fans are no longer available and are superseded with a new 5-blade fan that fits the early 944s according to pelican parts fitment guide

https://www.pelicanparts.com/More_In...c=Y#fitmentAnc

it seems much smaller in diameter and the blades are angled differently ,

I'm already replacing my old radiator and decided to go with the 6-blade fan upgrade from the late 944's since it will draw more air and provide better cooling especially in the middle east where i live ,
anyone knows if this new 5-blade fan is a direct bolt-on without the need of replacing the lower rad hose to avoid scrubbing?
or is it the same diameter as the 6-blade?

Yours sincerely,
Hamad

herdy44

I don't know about the dimensions of the new 5 blade fan, and if the blade angles will affect contact with original equipment .
I wonder what draw the 5 blades have in comparison with the older 6 blade fans.
Only Last month I had a 6 blade and 3 blade fan side by side running outside of the car just to have a comparison of the airflow, and it's night and day. The 6 blade unsurprisingly has so much more flow, so I wonder why they've changed to a 5 blade . ( Obviously the rake of blade angles makes a difference)

What sort of heat do you drive your 944 in Bahrain?
Are the fans running constantly and what temperature is your coolant running at on your temp guage?

bonus12

If you're going with the 6-blade, it should work.
The guy in this thread posted some directions.
https://rennlist.com/forums/924-931-...-83-944-a.html

"The passenger side fan comes very, very close to the early style lower hose."
"There is a later model hose that will clear without [roadside-style modification] (# 944 106 237 07)."

Hamad89

It mostly runs in the middle during highway driving and when there's not alot of traffic (89c) , it just creeps up to the 3rd mark(97c) and back down when sitting idle in traffic, also after a long drive that is followed by stop and go traffic , usually during fast speed fluctuations ,
a local tech replaced the stock thermo-switch which was (89/97) to a 75c switch, paired with a stock thermostat (83c)


while driving in summer recently the temp got stuck in the 3rd mark and stayed there strangely even during highway driving, it overheated when i reached a traffic signal , so i stopped for a while and kept the heater on full blast, then drove slowly to a garage.

fortunately the engine remained undamaged , just the radiator leaked due to pressure buildup and age, and thermostat obviously was jammed due to age also

Let me know if you recommend the 5-blade swap,
I think it succeeds the 6-blade fan in effect since its been superseded otherwise why would Porsche make an updated fan

my plan is to just use the stock shroud and ziptie the connectors to allow it to fit properly with the late fans , and use a late lower coolant hose if there's not enough clearance. and also revert back to the stock temp thermo switch

Hamad89

Thanks,
I really cant confirm if the 5-blade fan also needs the same adjustment to the lower water hose like with the 6-blade fan.
The blades on the updated part number look shorter compared with the old 6 blade fan


94462402105 from Porsche

944-624-021-05 from URO

NC944er

For what it's worth, I called Pelican Parts and spoke with one of their Porsche specialists, who confirmed that part number: 944-624-021-05 is the correct fan for both the early and later cars. The part number has been superseded twice over the years... perhaps the 5-blade version better accommodates the early radiator hose issue and was part of the reasoning for a change to fit all vehicle types? In any event, 5 blades has got to be better than 3 right?

Hamad89

Thanks a lot for helping out , as you said the part numbers for the fans has been superseded twice (944 624 021 01 being the original 3-blade fan , ending with 03 is for the 6-blade , and 05 for the 5-blade)
hopefully it will pull more volume of air and help cool down the engine faster than the old style fans.

Kind regards,
Hamad

Hamad89

Thanks a lot for helping out , most probably it will provide better clearance to accommodate the early 944 lower radiator hose , the last 2 digits were revised as you said twice , initially ending with 01 , 03 then 05 which is the 5-blade version. hopefully it will pull in more and help cool down the engine faster than the old 3-blade fan.

Yours sincerely,
Hamad

Hamad89

Thanks alot for helping NC944er
Its most probably to provide better clearance to accommodate the lower radiator hose on the early cars or maybe it has a more efficient design than the 6-blade ,
the last 2 digits of the part numbers have been revised twice as you mentioned , initially ending with 01 , then updated with 03 and 05 .