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Old 01-20-2013, 06:48 PM   #1 (permalink)
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Default 66 mustang overheating

I have a 66 mustang, 289 coupe. I took her out yesterday and bought new tires and also got an overheating problem. Good and bad, i wasnt sure if the gauge was working so i got that one figured out but overheating is no good. The temp gauge went to hot and it puked over the side. So i replaced the radiator cap, flushed and replaced the coolant as well as new thermostat and gasket today. Went for a short drive in this nice weather and it was fine for a bit and started to get hot again. Whats the normal place for the temp gauge on the stock gauge cluster? It went up to about three quarters, i would imagine it needs to stay at about half, but am i wrong. Just need to know before i go for water pump and radiator. . .Thanks!
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Old 01-20-2013, 06:52 PM   #2 (permalink)
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Pull the dipstick and check the oil. Its not likely a head gasket problem, but checking the oil for water takes just a minute. If the indicator is inside the normal range, that's not really an overheat. If it goes above, then there's definitely a problem.

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Old 01-20-2013, 07:03 PM   #3 (permalink)
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ya i checked the oil while it was warm, seemed normal. yesterday it just pegged out and overheated, but today it went to about three quarters and i put her back in the garage to avoid another overheat and get back in time for the end of the NFC champ game.
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Old 01-20-2013, 07:06 PM   #4 (permalink)
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Did it previously not overheat?

According to the manual, it should point to the e in temp when fully heated to 190.

Replacing the water pump will not help. They do not lose power- they can only leak, or have a bad bearing. Flush the radiator. Then get back to us.
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Old 01-20-2013, 08:18 PM   #5 (permalink)
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I flushed it today when I had it open for the thermostat change. I ran it through three times till it was fairly clear.
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Old 01-20-2013, 08:28 PM   #6 (permalink)
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OK, did it run cool before all this?
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Old 01-20-2013, 08:50 PM   #7 (permalink)
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Yesterday was the first time i had driven it outside my neighborhood at speeds above 30MPH since buying the car. So all i had done was drive around the neighborhood and idling but it had not been a problem then.
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Old 01-20-2013, 09:02 PM   #8 (permalink)
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there are a number of things that could cause overheating but one of the most overlooked is ignition timing.

i'd put a mechanical gauge on it to make sure your gauge is working correctly and just for piece of mind for a bit even if it checks out.
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Old 01-20-2013, 09:07 PM   #9 (permalink)
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You definitely want to check all the cheap and easy stuff before buying expensive parts. If the radiator is clean and unclogged inside, there are other ways, cheaper than radiators, to improve cooling.
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Old 01-20-2013, 09:43 PM   #10 (permalink)
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If the vehicle has sat for some time, it could be a clogged radiator. When I purchased my car I had to replace it due to overheating. These older engines flake off a bunch of crap and clog up the radiator. I installed a tefba filter with my new radiator and it needs cleaning often.
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Old 01-20-2013, 09:48 PM   #11 (permalink)
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Did you put the thermostat in the right direction?
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Old 01-20-2013, 10:51 PM   #12 (permalink)
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Quote:
Originally Posted by Lovies66 View Post
Did you put the thermostat in the right direction?
I put the spring end facing the engine, its my first time changing one so i looked it up several times and had the repair manual open.
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Old 01-20-2013, 11:17 PM   #13 (permalink)
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Quote:
Originally Posted by coug74 View Post
Yesterday was the first time i had driven it outside my neighborhood at speeds above 30MPH since buying the car. So all i had done was drive around the neighborhood and idling but it had not been a problem then.
I take it you haven't had the car long then.So it could have had an over heating problem without your knowlege. A few questions come to mind here. Is the factory fan and shroud still on the car? Some people put on aftermarket fans and discard the shroud which helps cooling of the engine. Second if the car has sat for a while you might want to take out the radiator and have it pressure tested for flow. If any of the passages are clogged it would definitely make it overheat.
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Old 01-20-2013, 11:21 PM   #14 (permalink)
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95% of the time it's a plugged radiator. Yank it, take it to a radiator shop and have it rodded. Another 4% of the time it's a air bubble stuck in the system or a lower hose that gets sucked closed. One percent of the time it's actually something serious.
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Old 01-20-2013, 11:47 PM   #15 (permalink)
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ya i havent had it maybe six months, put alot of work into it, but im still a noob at automotive work, im an aircraft mechanic so im not new to mechanic work in general. If this doesnt work im going to pull the radiator, the car sat for a long time in Oklahoma so its got dust and dirt in there.
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