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Thread: Electric fan & shroud install

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    Electric fan & shroud install

    I had a hot rod shop install a 1800 cfm electric fan with custom shroud.
    This was to solve my traffic overheat problem. It kept my traffic temperature to around 200.

    But when i'm on the fwy going 60mph slight incline, temperature quickly went up to 220 and climbing.
    It used to be 180-200 before electric fan install.

    Can you guys see if there's anything wrong with this install?

    Click image for larger version. 

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    1966 GMC / 292 ci / 700r4 / Air Suspension

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    VCVC Member garagedoordennis's Avatar
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    what direction is the fan spinning? ( pushing or pulling ?)
    Do you have a belly pan ?
    1968 Chevy 90 250/700r/Fuel Injected - sold and missed
    1966 Chevy handyvan 350/auto (work in progress)
    1965 GMC 350/auto ( just had to have )

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    Quote Originally Posted by monkeykongking View Post
    I had a hot rod shop install a 1800 cfm electric fan with custom shroud.
    This was to solve my traffic overheat problem. It kept my traffic temperature to around 200.

    But when i'm on the fwy going 60mph slight incline, temperature quickly went up to 220 and climbing.
    It used to be 180-200 before electric fan install.

    Can you guys see if there's anything wrong with this install?

    Click image for larger version. 

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Views:	127 
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ID:	36959
    My fan is on the outside ( the opposite of yours) . You need to see which direction the fan is going . That may be your problem. Most fans you can reverse the wires to change the direction of the blades. In my opinion the fan needs to be on the other side ( my opinion) the shroud might be alright where it is.

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    Quote Originally Posted by garagedoordennis View Post
    what direction is the fan spinning? ( pushing or pulling ?)
    Do you have a belly pan ?
    Fan is pulling. I do have a belly pan.
    1966 GMC / 292 ci / 700r4 / Air Suspension

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    VCVC Member panelmanrd's Avatar
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    I had same issue with my electric cooling fan, worked awesome
    in traffic, but on the highway above 70 engine would not stay
    cool kept creeping up, if I slowed to 65 temp would come back
    down and stay there. I think its an aerodynamic issue, the air
    stops flowing through the rad and just goes under the van.
    I had ideas of installing a deflector at the bottom of the rad
    dropping down into the airstream about 2 to 3 inches hoping
    this would cause the air pressure behind the rad to lower causing
    the air to flow through the rad, I never got there just put the clutch
    fan setup back on, but now it gets warm sitting still, so I intend to
    install an electric fan on the front of the rad wired through a relay
    that is triggered by the brake lights, so when my foot is on the brake
    the fan runs, should cure my issues. going to get this done this weekend
    54 chevy panel truck 355 tpi 700r4 325/9in
    64 chevy 90 5.7 tpi 700r4 336 8.2
    69 chevy panel van 5.7 tbi 700r4 336 8.2

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    Van Addict SteelyVan's Avatar
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    Some things to consider that has worked for me. This is not intended as a "cure-all" for everyone.

    I have a flex-a-lite 160 fan/shroud (3000cfm) w/thermostat and set up as a puller. The thermostat has a potentiometer to choose off/on temps (set mine @ approx 170/190) . The fan motor is of the type that has virtually no mechanical or magnetic drag when off. When I'm in stop-and-go traffic, the fan runs automatically as needed. When I get up to highway speeds, the fan shuts off and "free-wheels"......letting air flow through (and past) the radiator. The van cools itself @ 40-45+mph by just moving. I have tall tires but rarely do 60+mph.

    250L6
    TH350
    4:10
    Stock downflow rad recored to 4 rows.
    Clutch fan removed.
    No bellypan.

    Hope this helps
    SV
    Last edited by SteelyVan; 06-13-2018 at 12:28 PM.

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    VCVC Member panelmanrd's Avatar
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    that is about exactly what I had on mine, stop and go sitting and all the
    way up to 65 it worked awesome, but at 70 she creeped up to 225 and
    that's when I slowed down to 65 and the temp came back down.
    54 chevy panel truck 355 tpi 700r4 325/9in
    64 chevy 90 5.7 tpi 700r4 336 8.2
    69 chevy panel van 5.7 tbi 700r4 336 8.2

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    Certifiable Vanatic RAY68108's Avatar
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    That gap at the top of your shroud, probably a gap at the bottom also, needs to be closed off, so your fan is pulling all its air through the rad. As it appears now, the fan is pulling from the path of least resistance...top and bottom gaps. I built a similar setup except my fan is a pusher on the front side of the rad. closed top, bottom and both sides, the fan pushes all its air through the rad. the fan is on a thermostat, it runs constantly while the engine is running...temp rarely gets over 200, in stop and go traffic or cruising the interstate.
    Just my observation, Ray
    68 108 panel parts donor
    69 108 sportvan deluxe 350 4bbl 700R4 3:36 posi

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    I showed the shop this link. After reading all the comment, they still think my radiator is shot.
    I didn't trust the radiator shop who re-cored the radiator 2 years ago anyway. So, i decided to order a new radiator.
    I order the one that everybody recommended.

    https://www.ebay.com/itm/67-70-Musta...anner=1&_rdt=1

    Will report back once new radiator is installed.

    Thanks!
    1966 GMC / 292 ci / 700r4 / Air Suspension

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    A new radiator will be installed. I will make sure all the gaps are sealed.

    I really hope this fixes the problem.



    Quote Originally Posted by RAY68108 View Post
    That gap at the top of your shroud, probably a gap at the bottom also, needs to be closed off, so your fan is pulling all its air through the rad. As it appears now, the fan is pulling from the path of least resistance...top and bottom gaps. I built a similar setup except my fan is a pusher on the front side of the rad. closed top, bottom and both sides, the fan pushes all its air through the rad. the fan is on a thermostat, it runs constantly while the engine is running...temp rarely gets over 200, in stop and go traffic or cruising the interstate.
    Just my observation, Ray
    1966 GMC / 292 ci / 700r4 / Air Suspension

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