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Discussion Starter #1
Hey guys, I've got an XY falcon with a 351 Cleveland, it's only got a lil bit of work done to it, 780 holley, electronic dizzy, mild cam, bout 240rwhp on the dyno, anyway it seems to be running real hot all the time, I've got a brand new 3Core XY GT Radiator from Aussie Desert Cooler and just put in a new Thermostat from GT Performance, sposed to have about 30% more flow, but the temp sits on about half most of the time and if I'm in peak traffic and have to stop and start heaps it goes upto 3/4's and even into the red, any ideas or thoughts? if needed I've got some pics of the engine bay if that might help
 

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What temp range is the thermostat?, I run 160 degrees, with a 7 fin fan with a shroud. If you have aircon and a tranny cooler in the front of the radiator, airflow will also be reduced.
 

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cooling on clevos canbe an issue. The XB I had was a b!tch for over heating and I ended up replacing all sorts of things until one day it just got better and I could drive around in 40+ with no probs.
What fan / shroud combo do you run?
 

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BSR Twin System (tm)
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Are you sure the Gauge is okay?
 

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not that it helps alot but did you widen the radiator support panel 1 inch either side to alow for its extra width? if its a gt sized radiator u should make the most and cut out the support, only other thing i can suggest is run a fanshroud and make it agood one or u will never get it to cool.
 

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Munch Munch Rice 4 Lunch
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thats what i'm saying tyretoaster, it needs one of the shrouds that runs all the way around the fan, we upgraded the cooling system on my mums 66 mustang, no matter what size radiator it had it still overheated, we ended up fabricating one out of steel, but yeah long story short the fan has to draw the air through the radiator to work.
 

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yeah the radiator is being wasted if air is not drawn through the whole unit, at speed it is not cooking right? but at idle fan is only pulling air directly infront of the fan so its not cooling as well as it could, you rother option is to lean in the mixtures.

I until now have run a standard 2 core (as fitted upto xe's) becuase fords 2 cores have large tubes and their 3 cores have small tubes they cool very similarly (factory 3 core not everything ppl make em out to be) and i could sit my car in 40 degree heat with aircon on and it goes a touch past half, using a factory fixed flex fan and factory fanshroud from my ZH Marquis ( now all being replaced).
 

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Slurry Boostin
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a bit ot, but i was having terrible troubles in traffic, even on not so hot days, into the red as well.

just a few days ago, fitted a thermo setup off an AU, brand new bout $260, nearly bolted straight up, and with my adjustable temp control, the needle doesn't move. awesome cooling.

very compact and neat looking also :)

If you do find that your fan cooling is not sufficient, i would have to highly recommend this setup over the conventional davies craigs I had on there.

they struggled.
 

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Whats traction?
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I'd say its a fan issue. Either a shroud or a conversion to thermos (I run an aussie 3 core triple flow, 12" davies craig and a 10" davies craig thermo and rarely ever have a problem anymore).

Failing that try replacing your water pump, that was the original cause of my overheating problems, but was only discovered after everything else was replaced (the first time, the above setup came later).
 

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Catching Bugs
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buy yourself a after market gauge like a splitfire or autometer i found that halfway on my dash gauge was on 80 on the mechanical gauge so urs might not be getting as hot as u think.
 

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RIP Sox.....
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Yep, fan issue. Get the biggest electric fan available and shroud it properly.
Don't bother with a mechanical fan, they suck too much power, and an electric comes on only when it's needed.

Rick.
 

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hey fellas, had the same problem in my xd
all we did to fix it was get a big 7 blader which sux heaps of power but works well, ohh, we also cut the plastic shroud about an inch all the way around to suck the most air through the radiatior at idle, worked for my but i dont know if it wil for you

XDman
 

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Discussion Starter #14
Thanx for all the input guys, the thermostat comes in at 170 degrees, and it has an aftermarket 7fin flex fan, no fan shroud though and I havn't widend the front an extra inch either side, I didn't relise it'd make so much difference not having the shroud there.
 

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Groovie said:
Thanx for all the input guys, the thermostat comes in at 170 degrees, and it has an aftermarket 7fin flex fan, no fan shroud though and I havn't widend the front an extra inch either side, I didn't relise it'd make so much difference not having the shroud there.

it makes no diffrence whatso ever having the fan shroud missing if you are doing anything over 40km/h as the whole radiator is being used by the air being forced trhought it, but at standstill the fan shorud makes the fan pull air through the entire unit just as if the car was moving.
 

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For months I have been trying to figure out why my 351c was running so hot (190-210F or higher) with a 180 thermostat. I have read all the posts and followed the suggestions, but to no avail. I have found the problem for 'my' overheating, and maybe to the overheating problems of many other 351 Cleveland owners. First, what I have.

Basically - 1967 Mustang 351c, C6 automatic, new 4 core radiator, blocked off heater outlet and inlet, Flamethrower III distributor, Performer intake, Sanderson block hugger headers and 351c specific thermostat, Flowcooler water pump. I rebuilt the engine and trans about 5 months ago. Overheats.

My theory and my fix: Removed brass water restrictor plate under thermostat, replaced it with a West Coast Classic Cougar aluminum water restrictor plate. Installed Stant 180 degree thermostat (now same as a 351w). Dang, still overheating!! I re-examined the Stant thermostat, and the hole to pass coolant when the thermostat opened seems awfully small. As a test, I left the thermostat out and drove all over creation (outside temperature was 60 degrees). Temperature did not exceed 150F. Hurray!!!! Finally! It appears that the thermostats currently sold are too restrictive, and while driving the car, temperature slowly creeps up till it is overheating. I don't want to keep running without a thermostat, so I ordered a Milodon 180 degree thermostat, which is supposed to be hi-volume. Hope to post results soon.
 
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