overheating, only at 55+mph ...? - JeepForum.com

 
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post #1 of 8 Old 09-18-2007, 09:04 PM Thread Starter
TXjeepTJ
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overheating, only at 55+mph ...?

soo, ive never had cooling issues before. i have an after market radiator to make up for the engine size(recommended) and had a ford escort electric fan/shroud. well last week the ford electric fan starts giving out, soo i took out the assembly and cut out the ford fan and put a high performance electric fan in its place (basicly its exactly how it was before, just a better fan). i had to drain the radiotor in order to get the fan out also i should add.



well i added fluid to the radiator, started the engine and once the thermostat opened i topped off the radiator. then added the 'overflow' can to full. it runs very cool at idle, but once i get on the high way it starts over heating by more than 20 degrees. once i slow down(get off the highway) it goes back to normal

any help would be awesome

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post #2 of 8 Old 09-18-2007, 10:37 PM
Dragon158
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I ran into the same issue with my brothers Ford pick up a few years back. In his case it turned out to be a clogged radiator. I know you said that you replace yours with after maket, but how many cores do you have? Maybe not enough?
Maybe even something as goofy as an air bubble in the coolant system?
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post #3 of 8 Old 09-18-2007, 11:03 PM
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We had that problem when we realized that there wasn't a thermostat in a rover a buddy bought a few weeks ago! So much coolant was going through that it didn't have the time to cool down. It was fine around town, and overheated on the highway. It might be that your thermostat has a problem with it.

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post #4 of 8 Old 09-18-2007, 11:24 PM Thread Starter
TXjeepTJ
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Quote:
Originally Posted by Dragon158
I ran into the same issue with my brothers Ford pick up a few years back. In his case it turned out to be a clogged radiator. I know you said that you replace yours with after maket, but how many cores do you have? Maybe not enough?
Maybe even something as goofy as an air bubble in the coolant system?

it has 3 cores, it shouldnt be clogged- its brand new installed a couple weeks ago, i've been running only water in it up until just now- i did a 25%anti-freeze

i had no problems at all with it the past 2 weeks, its almost like i didnt add coolant right or something

the water pump has a thermostat in it soo that knocks that prob. out lol i replaced the water pump about 3 weeks ago
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post #5 of 8 Old 09-19-2007, 04:21 AM
BlackJeephunter
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Do you have a which or anything in front of the radiator?

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post #6 of 8 Old 09-19-2007, 06:31 AM
cj847
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Congrats on the V8 swap, that's great.

On the cooling it's a wild guess due all the modifications. First thing I would do is as it overheats turn the heater on hot and high. If this cools it down, it shows you don't have enough cooling capacity. (I don't know if an even bigger radiator is available).
Other wild guesses on my part:
-Is the fan working properly? At highway speed it may actually be in the way and hurting air flow. I would think it should be freewheeling at 55. If it is actually running, it could slow down the air.
-Kinked hose not allowing enough flow?

Good luck

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post #7 of 8 Old 09-19-2007, 06:38 AM
Erin Go Bragh
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That coolant mix should be 50\50 antifreeze and water. That would increase the boiling point higher than the 25 percent mix you have in there.

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post #8 of 8 Old 09-19-2007, 07:55 AM
elfman69
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you might be collapsing you radiator hoses

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