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morodder
    
why is my mustang over heating?
iv got a 69 ford mustang with a 351 cleveland turning about 350-375 horse. it has an original 1970 mustang radiator that i think came with the cleveland engine. its a 3 core and is 20" wide. its got a shroud and the proper fan with the proper spacing. is it just possible this radiator is too small and cant handle the added power? im looking into aluminum radiators that will bolt right up, but i dont want to spend more money on this thing than i have to. any help will be very much appreciated. its been a long 4 years of setbacks trying to get this thing on the road.
posted: September 26, 2010
 
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  Answers (6)
 
23dodges10
    
Has the radiator been to the shop and cleaned? A reputable shop will pull the tanks, rod the cores and put it back together for @ 100 bucks. A honest shop will also let you know if there is not enough cooling capacity. A 3 core may not be enough.
posted:  September 27, 2010
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retiredpartsman
    
A WAY TO CHECK FOR A PLUGGED RADIATOR IS WITH ENGINE WARM AND NOT RUNNING, RUN PALM OF YOUR HAND OVER THE CORE OF RAD IF THERE ARE COOL OR COLD SPOTS THE RAD IS STARTING TO PLUG OR IS PLUGGED ,AT THE SAME TIME CHECK FOR LOOSE OR ROTTED FINS , HAVE TO BE TIGHT TO TRANSFER HEAT.
posted:  September 27, 2010
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morodder
    
It has been thoughly cleaned by a reputable shop. i even tried an electric fan as well
posted:  September 28, 2010
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ronc4
    
There are several proceudures.
1. Warm up eng. remove fan belts, remove rad cap. Examine for bubblesf bubbles, your head gasket is leaking.
2. Slipping water pump impeller. Remove lower radiator hose & belts. insert coat hanger wire while turning pump
3. Upside down thermostat, defective thermostat.
4. If you already took out thermostat & it over heats, it is almost certain a bad head gasket.
posted:  September 30, 2010
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oldshool
    
Selected as Best Answer
Hi morodder you mentioned 4years has the car sat longer that before you got it?I had a 66 ranchero that sat for some years could'nt get it up the street without geting hot.flushed te radiator about a hundred times to find out the block was full of years of grime and sludge knocked the freeze plugs out picked and pulled out all the crud never got hot again,if all else fails try that it's about the last thing most people think of Good Luck "OLDSCHOOL"
posted:  October 13, 2010
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morodder
    
thank you. i took all your advice into consideration. the engine has been rebuilt and the water passages are clean. i decided to give in and get a new radiator. its a 26 inch meant for a big block car.
posted:  October 15, 2010
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