5 or 7 blade cooling fan on 1984 Chevy 454?

[ramit]

hi guys i am a little confused as to what fan belongs on our rv .its an 1984 itasca with 454 engine ..some say its a 5 blade and some a 7 blade ..PO has put a flex fan on it and sure it dont belong  ..

[Rickf1985]

It should be a large five blade with a thermostatic fan clutch. You may still have the clutch but if it is old it is a good idea to replace it since it is a bit of work and you will already have the shroud apart.

[ramit]

yes the PO replaced the clutch its new think he was trying rectifie the problem but didnt relize the flex fan didnt belong .. thanx so to find a 5 blade now and getter done

[chip2lane]

I had a 5 blade fan on mine and swapped it out for a 7 blade for better cooling.  Still have the original if interested.  Also have the part number for the 7 blade if you like. 

[ramit]

Hi chip got a fan from frogger already but would mind havin part number for the 7 blade just in case its needed ...Love this group great bunch of guy&gals 

[chip2lane]

The GM part number is 3999260 it is a 19.5 inch 7 blade fan. I was having overheating problems and went through the cooling system. My radiator had a small leak but was very rusty. So I replaced it with a new one from rock auto.com for 190.00 delivered.  While I was in there I replaced the thermostat with a new 180 degree one. The 10 degrees is not enough of a temp difference to cause a issue with the computer.  Now no matter what she never gets above 195. Love it when a plan works.

[ramit]

Thanx chip i'll write that number down in case i need it...

[cncsparky]

Mine has the 7 blade fan, looks factory.  Did they change to 7 blade fans in later years?

[ramit]

think they may have change to 7 blade i recall  my 89 corsair  haveing 7 also

[ttd512]

I have a 85 with a 454, it has a 7 blade.

[ramit]

got a 5 blade now so will be installing that anythings gotta be better then the flex fan PO installed