Help! Engine overheating after gear change. - Ford Mustang Forum
 
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post #1 of 9 (permalink) Old 10-10-2013 Thread Starter
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Help! Engine overheating after gear change.

I just had a very reputable company swap out my stock gears for 3.73 gears. On the way home the temperature gauge went to high and the temp warning light came on. I am bringing it in tomorrow but if anyone has a clue I would appreciate the info. Thanks


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post #2 of 9 (permalink) Old 10-10-2013
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Which year is your Mustang, and how many miles does it have? Where is the coolant temperature gauge needle? All the way to the H mark, or just beyond the middle?

So your Mustang was working fine before the gear swap? The only thing related to a gear swap I can think of is the higher engine load under acceleration, and the higher RPM, after gear swap. They shouldn't touch your engine for this work.

Is your coolant level good? Did you check to see if there is any engine code? I wonder if your thermostat is stuck closed.


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post #3 of 9 (permalink) Old 10-10-2013
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Brakes dragging? Forgot to put oil in diff? Problem with tune for new gears?
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post #4 of 9 (permalink) Old 10-10-2013 Thread Starter
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Quote:
Originally Posted by Liv4spd View Post
Which year is your Mustang, and how many miles does it have? Where is the coolant temperature gauge needle? All the way to the H mark, or just beyond the middle?

So your Mustang was working fine before the gear swap? The only thing related to a gear swap I can think of is the higher engine load under acceleration, and the higher RPM, after gear swap. They shouldn't touch your engine for this work.

Is your coolant level good? Did you check to see if there is any engine code? I wonder if your thermostat is stuck closed.
2011. 34,000 miles. just went through dealer inspection no issues. all the way to H.

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post #5 of 9 (permalink) Old 10-10-2013
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Unless they crushed your exhaust system while working on your car I am not sure how they could make your car start overheating. Every time I have ever seen a car overheat it was a bad thermostat or a coolant leak.


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post #6 of 9 (permalink) Old 10-10-2013
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Very strange, not at all expected with a gear swap . . . . seems like some coincidence, maybe they did something stupid at the shop like lowered the bottom of the radiator onto something on the lift . . . I would think that, even if they forgot to fill the rear end with lube, it would burn up the rear end before the engine would overheat.

Check for the obvious stuff -- like does it have coolant in the radiator? Is the fan wire still connected?

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post #7 of 9 (permalink) Old 10-10-2013 Thread Starter
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Just drove it again, same thing. Also, notice now it it doesn't let me shift from drive to nuetral without holding in the shift button. Before I could just push the shifter from drive to nuetral.

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post #8 of 9 (permalink) Old 10-11-2013
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I suspect your engine overheating is not part of the rear gears issue. I am pretty sure you have to hit the button to go any higher up the gear selector past drive. I do not remember every being able to dump it up into N without the button and really why would you.

I would get the car to operating temp at idle, watch the cooling fan and make sure it goes on with the car in D brakes on just sitting.

I would check reservoir and radiator for leaks and check the lvl. I would also while cold check to see if fluid is circulating in the radiator to ensure the water pump is pumping.

Other than that other than a thermostat or (very rare for 30K+ miles) head gasket. I cannot imagine it is anything else.
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post #9 of 9 (permalink) Old 10-11-2013
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I like the idea of letting it idle and see if it happens. The rear brake calipers were removed during the gear change, if they were not properly reinstalled maybe theyre dragging. Can you tell if your parking brake still works? This is part of it too.
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