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Old 07-06-2012, 02:51 PM   #1
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Overheating problem

Hey guys I need some advice, my 68 coupe has the bad habit of overheating. Every time my car is on And parked it over heats. No problem on the freeway but anytime I have to make line its not pretty. I thought about a new radiator and electric fan, would this do? All help appreciated.
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Old 07-07-2012, 01:12 AM   #2
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How old is the radiator? You didn't bypass the heater core? It sounds like your radiator is full of crap and circulate and cool. If you turn on your heater when it starts overheating, does that make a difference?
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Old 07-09-2012, 04:39 PM   #3
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Quote:
Originally Posted by My68mustang
Hey guys I need some advice, my 68 coupe has the bad habit of overheating. Every time my car is on And parked it over heats. No problem on the freeway but anytime I have to make line its not pretty. I thought about a new radiator and electric fan, would this do? All help appreciated.
How's your fan does it spin freely when motor is not running? If so it may just be the fan clutch and it needs replacing.
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Old 07-09-2012, 10:57 PM   #4
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I almost never turn on the heater, there is no need for it here in Arizona. And I think the clutch for the fan is ok because it does spin when I'm not accelerating it just does it slowly, the fan is also pretty small.
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Old 07-10-2012, 05:49 AM   #5
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Originally Posted by My68mustang
I almost never turn on the heater, there is no need for it here in Arizona. And I think the clutch for the fan is ok because it does spin when I'm not accelerating it just does it slowly, the fan is also pretty small.
What I'm saying is with your engine not running spin your cooling fan with your hand there should be resistance. If it spins freely or makes a full revolution than your fan clutch needs replacing.
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Old 07-10-2012, 07:53 AM   #6
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When a car is overheating, turning on the heater will cool it a little, because the heater fan blows across the heater core and reduces the heat some. Even though you may not need a heater, not having a heater core can elevate the engine temp. Even when the heater is off, the heater core helps cool the engine.

I'm not sure a 68 had a fan clutch, it may be a direct drive, same speed all the time. My 67 was setup that way. It might be the wrong size fan blade.
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Old 07-10-2012, 06:09 PM   #7
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Oh I see what you mean about it spinning freely. I guess it's fine because there is resistance. And I did not know that about the heater, I should check on that. Thanks.
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Old 07-10-2012, 08:07 PM   #8
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Re: Overheating problem

A leak will disperse fluid and suck in air. Radiator caps go bad. Air in system causes bad things to happen. If flushed with chemicals, it will foam up and do nasty things untill completely gone. Broken off/missing air deflector behind front bumper will cause lots o heat. One you get the system straightened out, pour in two bottles of Lucus Supper Coolant additive. It really, really does work. I have tried Water wetter, Royal Purple, all kinds before and they did nothing. This stuff truly does work:
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Old 07-10-2012, 08:13 PM   #9
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definatley a air flow problem. all good suggestion so far. are the fins bent up really bad on the radiator? is there anything blocking the front of the raditor? make sure you have a shroud. then i would suspect the fan.
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Old 07-11-2012, 12:32 AM   #10
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I don't have a shroud so that's definitely something I'm going to take care of, Although i dont know about the radiator. I'll also look for that lucus supper. All good ideas, thanks guys.
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Old 07-11-2012, 05:00 AM   #11
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Definitely need a shroud
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