Classic Mustangs (Tech) Technical discussions about the Mustangs of yester-year.

cooling system upgrades?

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Old Apr 2, 2010 | 02:53 PM
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setx69fastback's Avatar
setx69fastback
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From: Texas
Default cooling system upgrades?

Have a 69 FB with F code 302 and auto trans. 2 core factory radiator and water pump need to be replaced, i'm looking to flush out the engine to remove buildup, new water pump, and upgrade the 2 core brass with trans cooler on the front to a 3 or 4 core (keep or replace external trans cooler?), and replace all the water hoses. any suggestions or thought on what to do, or just get a mustang barn catalog and replace with standard 3/4 core and cast iron water pump? summers don't usually get over 100, but it does stay hot a majority of the year here. want to get as efficient as possible for a daily driver without breaking the bank.

Also pretty sure the transmission cooler lines are leaking, recently replaced the gasket on the pan, but notice most of the leak was coming from around or near the top, just haven't had time to lift the car enough to trace it down. should those lines be replace with everything else?

I have the original radiator cleaned up and packed in case i ever sell it, trying to keep all major factory parts as they are replaced / upgraded, is the water pump worth keeping?
Old Apr 2, 2010 | 04:31 PM
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2+2GT
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3-row, unless you are really desperate for that last ounce of cooling. And a fan shroud, and 6-blade thermal clutch fan.
Old Apr 2, 2010 | 04:37 PM
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setx69fastback
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have a shroud, and a six bladed fan. not sure what type, but i'll get a model number tomorrow. worth the money to replace if its not a certain type?
Old Apr 2, 2010 | 04:50 PM
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It's not one of those "flex fans" is it? I like the thermal clutch fans, they are steeply pitched for moving a lot of air, and the thermal clutch idles the fan for increased power and mileage when cooling is not needed. It's about a 5hp boost, and similar increase in mileage.

Old Apr 2, 2010 | 06:45 PM
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Originally Posted by 2+2GT
It's not one of those "flex fans" is it? I like the thermal clutch fans, they are steeply pitched for moving a lot of air, and the thermal clutch idles the fan for increased power and mileage when cooling is not needed. It's about a 5hp boost, and similar increase in mileage.

Hi, I am going to ask a stupid question so here we go,
I bought a water pump and it said 221, 260, and 289 (pn# 125-2819 ). When i got it a week later the pump was tiny. Woldnt fit. I had to re order the pump but i had to pick the one that says 289,302,351 (pn#125-1420P ) . That pump fit like a glove.
And so my question is are thez 2 different blocks?
Old Apr 5, 2010 | 02:41 PM
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Get a aluminum radiator and go with a electric fan
Old Apr 5, 2010 | 03:56 PM
  #7  
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Regardless of what you do on radiators, thermostats, etc., I would recommend getting a large big block size fan and shroud. I think they run about 19" in diameter. The more air you can get through the radiator, condenser, and oil coolers, the better heat exchange you will get. I am not a big fan, no pun intended, of electric fans. They do not look original, they require a fair amount of wiring, they increase the load on your alternator/battery, they are an easy point of failure, and are generally expensive. If you were building a race car that needed every inch of torque to go to the rear wheels, yes put on an electric fan and electric water pump, but why do that on a street car? Why go through the trouble when a good quality large diameter fan moves more air, is easier to install, and is cheaper? Flex-A-Lite makes a great flex fan that I spin to 7,000 rpm with no issues.
Old Apr 5, 2010 | 06:08 PM
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i ran a 3 row, factory ac and trans cooler in radiator, here in arizona with summer temps hitting 120 degrees, can ran fine. went to a 4 row and it runs a little hotter than the three row, shop said its harder for the air to get through the 4 row. anyway if a 3 row with ac in 120 temps work than a 3 row will work anywhere.
Old Apr 5, 2010 | 07:21 PM
  #9  
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Originally Posted by ic237
Hi, I am going to ask a stupid question so here we go,
I bought a water pump and it said 221, 260, and 289 (pn# 125-2819 ). When i got it a week later the pump was tiny. Woldnt fit. I had to re order the pump but i had to pick the one that says 289,302,351 (pn#125-1420P ) . That pump fit like a glove.
And so my question is are thez 2 different blocks?
No, two different timing covers. The earlier aluminum pump uses the timing cover as the back half of the pump housing, while the later iron pump is self-contained. They are not even close to interchangeable. My 289 High Performance uses the earlier aluminum pump. Ford switched these as a "running change" during 1965, that is, there was no date for Change Level 7.
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