i have a 91 firebird 5.0 tbi and i was wondering if anyone knew how to fit a water pump fan in exchange for the electric fan....

 

Remove the electric fan and shroud, remove the water pump pulley bolts, bolt on a reverse rotation fan, install a mechanical fan shroud.

 

i dont think the bolts will fit in the same water pump for the pulley...he will have to buy a new water pump for which ever set he wants...i did the same thing and i had a new water pump so i can bolt on the pulley...

 

The water pump hub is the same.

 

I just have to ask why? Really moving backwards with this one.

 

if you use original '82-85 fan shroud,the camaro and
firebirds used different shrouds on the v8s;camaro
shroud is meant for18.5"fan,17"for firebird-not sure if
camaro shroud will fit firebird.You might have to change
or rework the A/C lines or upper radiator hose to clear
the belt drive fan shroud.
Each of the usuall fan types(electric,flex,clutch)have
specific advantages and disadvantages VS the other
types,so depends on the characteristics you want for
the best fan type

 

I have to agree, OP your going from an efficient, amp-drawing only fan to a less efficient, horsepower robbing fan. Maybe there is an underlying reason I just fail to see it.

 

Is there enough clearance under my hood for that because it looks tighter than a elephant in skinny jeans....

 

there is actually plenty of room-i even have a H/D"cop"
fan clutch on mine with clearance to spare.

 

Ok im having cooling problems with the ac running. this is the second summer.....I have new everything....I want to try a mechanical fan. So your saying I would need a fan shroud from an 82 -85 camaro a 18.5 inch fan and a fan clutch right. can you think of anything else i would need.

 

i think on a '92 you'd need to rework some of the A/C
lines and use the upper radiator hose from an '82-85
Also the fan will need to be reverse rotation on '88-up
serpentine belt systems,i think the fan from a '91-93
caprice is 18.5"diameter but i have not actually
measured one.Early '90s s-10s with 4.3 might be
suitable too.if you get one of these fans at a junkyard,
also take the studs/nuts as the bolts for just the pulley
are too short.

 

this is what i want to do with my 2.8 MPFI camaro because the electric fan wiring is just giving me a headache on top of the possible cost of fixing it and the worry of overheating the only problem is clearing the intake and MAF

 

really tough to put a mechanical fan on a MPFI '85 up
v-6 because the water pump hub is not meant to mount
a fan-a friend wanted me to help put a belt drive fan
on an '89 firebird 2.8 and i could not come up with a
good,easy way to do it(main reason he wanted the belt
fan was because all the fan wiring had been tampered
with and was all FUBAR)I ended up keeping the original
electric fan(it's plenty of fan for a 2.8 anyway)just made
up a complete new fan circuit-used a flexalite capillary
tube style mechanical temp switch-took off the upper
radiator hose,put the sensing bulb into the hose and
reinstalled the hose with a little silicone to seal with
the capillary tube in place.Used the (adjustable)temp
switch to activate the fan relay-was totally reliable,set
the fan to come on around 210*

 

i think i saw a similar set up on a carbed LT1 in a Grand National years ago...i was wondering where i could get all the parts to do that do they sell stuff like that at Auto Zone, Advance Auto or Summit...etc?

 

looks like flexalite still sells the capillary tube style
mechanical temp switch-#31147,180-240*adjustment
range and rated for 20 amps-could use it to directly
switch most fans without using a relay,but still best to
use a relay so that fan circuit can switch off with the
ignition switch-not good to run larger fans directly off
the ignition switch because of the high startup current
drawn as the fan gets up to speed can cause problems.

 

Do not go mechanical - they work fine at higher engine speeds, but suck power and don't cool as well at idle or low speeds.

What you need to do is add either 1 or 2 thermostatically controlled pusher fans in front of the radiator - that will pull more air through and cool much better.