Why is my tranny overheating so easily? - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 12 (permalink) Old 08-06-2009, 06:09 PM Thread Starter
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Why is my tranny overheating so easily?

The past few weeks ive been running into a transmission problem. It will overheat after 20 minutes of around town driving. If im on the freeway and keep the TQ locked up I could probably drive 80 miles before it reaches 230. The temp rises like normal, but keeps going to 230 and beyond if I let it. I usually try to get back home and let it cool down before it gets to 230. Is there a thermostat that isnt allowing fluid to the cooler or some kind of Bypass? Do the coolers get clogged that they no longer cool anymore? I replaced the fluid probably 30-40k miles ago, so im due for another change but dont want to change the fluid to find out its time for a rebuild.
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post #2 of 12 (permalink) Old 08-06-2009, 07:52 PM
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Re: Why is my tranny overheating so easily?

check your pump myne just went up and it kept having problems

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post #3 of 12 (permalink) Old 08-06-2009, 08:58 PM Thread Starter
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Re: Why is my tranny overheating so easily?

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Originally Posted by lil20bruski View Post
check your pump myne just went up and it kept having problems
How do you check the pump?
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post #4 of 12 (permalink) Old 08-07-2009, 03:03 AM
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Re: Why is my tranny overheating so easily?

gotta prolly take it to tranny shop... i had to, myne burnt up and melted the tq converter to the hub.

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post #5 of 12 (permalink) Old 08-07-2009, 03:10 AM
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Re: Why is my tranny overheating so easily?

The transmission would have to be removed to inspect the pump visualy, but there are flow rate meters to tell if it's functioning properly, without the r/r. Most connect at the cooler line inputs.

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post #6 of 12 (permalink) Old 08-08-2009, 04:32 PM
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Re: Why is my tranny overheating so easily?

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Originally Posted by SnwMnkys View Post
The past few weeks ive been running into a transmission problem. It will overheat after 20 minutes of around town driving. If im on the freeway and keep the TQ locked up I could probably drive 80 miles before it reaches 230. The temp rises like normal, but keeps going to 230 and beyond if I let it. I usually try to get back home and let it cool down before it gets to 230. Is there a thermostat that isnt allowing fluid to the cooler or some kind of Bypass? Do the coolers get clogged that they no longer cool anymore? I replaced the fluid probably 30-40k miles ago, so im due for another change but dont want to change the fluid to find out its time for a rebuild.
Need to check the bypass line.

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post #7 of 12 (permalink) Old 08-08-2009, 04:47 PM
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Re: Why is my tranny overheating so easily?

pull the return line from the cooler to check the flow then check the incoming line I bet your cooler is clogging up you should get the same amount of fluid in 30 secondes on both sides if the return side is less ( or none at all) you need to reverse flush your cooler . if it cloggs up again time for a tranny I bet the clutches are haeded south or the converter how is it shifting??

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post #8 of 12 (permalink) Old 08-10-2009, 06:13 AM Thread Starter
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Re: Why is my tranny overheating so easily?

Quote:
Originally Posted by Cratos View Post
pull the return line from the cooler to check the flow then check the incoming line I bet your cooler is clogging up you should get the same amount of fluid in 30 secondes on both sides if the return side is less ( or none at all) you need to reverse flush your cooler . if it cloggs up again time for a tranny I bet the clutches are haeded south or the converter how is it shifting??
Shifting varies, sometimes its perfect, sometimes its really harsh, and usually when it starts to get closer to 200 the shifts are sluggish. I know its about time for a new tranny, just trying to save up.
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post #9 of 12 (permalink) Old 08-16-2009, 01:19 PM
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Re: Why is my tranny overheating so easily?

Quote:
Originally Posted by SnwMnkys View Post
Is there a thermostat that isnt allowing fluid to the cooler or some kind of Bypass?
Some transmissions have thermostats, some do not. If I knew what truck you had I could tell you.

Quote:
Originally Posted by SnwMnkys View Post
Do the coolers get clogged that they no longer cool anymore?
Yes, that can happen.
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post #10 of 12 (permalink) Old 08-18-2009, 03:16 AM Thread Starter
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Re: Why is my tranny overheating so easily?

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Originally Posted by Mark Kovalsky View Post
Some transmissions have thermostats, some do not. If I knew what truck you had I could tell you.


Yes, that can happen.
Sorry its a 4R100. The truck is a 99 F250.
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