High speed overheating / have trans cooler and SPAL - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 19 Old 06-23-2010, 07:53 PM Thread Starter
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High speed overheating / have trans cooler and SPAL

I have a trans cooler, Also have a SPAL fan and shroud.

I have noticed that on very hot days here in SW Florida (95 plus) that when driving on the highway (over 70mph) that my engine temp will come up to almost 3/4.

I was having a problem with the factory fan (reason for the SPAL) with my low speed driving and having the temp go to and over 3/4. The SPAL fan has fixed the low speed overheating. Didn't notice the high speed overheating issues before.

Now, my problem is when driving on the highway at the higher speeds. I notice the temp gauge going up and the A/C not functioning like it should. Now, if I slow down to around 60 the temp gauge drops and the A/C gets cold again.

The question(s):

What is causing the temp gauge to raise when driving high speed?

Will adding a trans cooler fan help?

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post #2 of 19 Old 06-23-2010, 08:03 PM
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might sound like a stupid question, but is your SPAL wired up backwards? I had the same issue. it was working as a pusher fan instead of a puller fan. At high speeds, the air coming in was working against the air being pushed by the fan causing the temo to go up. get the fan to come on and see if a piece of paper will suck into the radiator. either it will get pulled in really hard)the right was) or it will not. It it doesn't, just switch the wires. That will change the fan direction.
Hope this helps.
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post #3 of 19 Old 06-23-2010, 08:11 PM Thread Starter
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Quote:
Originally Posted by The Joker View Post
might sound like a stupid question, but is your SPAL wired up backwards? I had the same issue. it was working as a pusher fan instead of a puller fan. At high speeds, the air coming in was working against the air being pushed by the fan causing the temo to go up. get the fan to come on and see if a piece of paper will suck into the radiator. either it will get pulled in really hard)the right was) or it will not. It it doesn't, just switch the wires. That will change the fan direction.
Hope this helps.
I am 99% sure it is installed correctly as you can really feel it pulling air throught the radiator...as in putting hand behind it inside engine compartment and feeling air. I only say 99% as until I do the "paper check" I won't be 100%.

BTW...did you leave yours as a two speed fan?

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post #4 of 19 Old 06-23-2010, 08:27 PM
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no. I just went with the 1 speed.
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post #5 of 19 Old 06-23-2010, 08:29 PM
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how much have you played in the mud? how did you radiator look when you had the fan out? I'd start with cleaning radiator out, using hose from the engine side with the shroud out of the jeep, spray back and forth top to bottom until only clean water is running off the radiator. do the same to the a/c cond. in front of the radiator.

the factory radiator fins are so damn tight dirt will stay in there forever and it affects the ability to cool greatly. Does it run hot at highway speeds without the a/c on also?


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A Jeep just zipped past my house and I could swear I heard the driver yellin:

"The tkob is coming!! The tkob is coming!!"
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post #6 of 19 Old 06-23-2010, 08:30 PM
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Quote:
Originally Posted by The Joker View Post
no. I just went with the 1 speed.
how did u leave it as a one speed? it is wired to the factory wiring after the resistor right?


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Quote:
Originally Posted by Dancin Dan View Post
A Jeep just zipped past my house and I could swear I heard the driver yellin:

"The tkob is coming!! The tkob is coming!!"
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post #7 of 19 Old 06-23-2010, 09:42 PM
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Quote:
Originally Posted by tkob1060 View Post
how did u leave it as a one speed? it is wired to the factory wiring after the resistor right?
I did. but then my resistor went out and I bypassed it. now, it comes on high whenever it comes on.
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post #8 of 19 Old 06-23-2010, 10:27 PM
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Thermostat probably sticking or the temp sensor going out, my money on thermostat
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post #9 of 19 Old 06-23-2010, 10:57 PM
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Quote:
Originally Posted by tkob1060 View Post
how much have you played in the mud? how did you radiator look when you had the fan out? I'd start with cleaning radiator out, using hose from the engine side with the shroud out of the jeep, spray back and forth top to bottom until only clean water is running off the radiator. do the same to the a/c cond. in front of the radiator.

the factory radiator fins are so damn tight dirt will stay in there forever and it affects the ability to cool greatly. Does it run hot at highway speeds without the a/c on also?

LMAO!!! Dirt in the radiator fins, hah! Well, I guess you would know!!!

RC

A lot of chit coming...

W9DRC

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post #10 of 19 Old 06-23-2010, 10:58 PM
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Quote:
Originally Posted by Flounder View Post
Thermostat probably sticking or the temp sensor going out, my money on thermostat
I'll second the thermostat, and raise you a coolant flush.

RC

A lot of chit coming...

W9DRC

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post #11 of 19 Old 06-23-2010, 11:26 PM
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What happens when the AC is turned off? You may have a AC problem.

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post #12 of 19 Old 06-24-2010, 01:11 AM Thread Starter
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Runs a little cooler on the highway w/o AC, radiator is clean...made sure of this when I put the SPAL in.

Thermostat.... will change that out, cheap and easy to check / replace.

It only does it on really hot days, 95 degrees plus is when I noticed it. Drove it hard on the highway 80mph + the other day running A/C on high and it never got much over half, outside temp 80-85.

What could the A/C problem be?

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post #13 of 19 Old 06-24-2010, 05:02 AM
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i have no overheating troubleshooting experence (execpt on old jeeps) but is there a chance the fan is coming on when your having the problems at high speed but the fans actually slowing the air flow down as it cant pull it faster than its getting pushed by the speed of the jeep?

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post #14 of 19 Old 06-24-2010, 07:47 AM
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Medcop- I'm still having some issues with mine as well since our last mud trip. The fan is working ok(just loud as shit), but mine seems to only get over 1/2 on the temp gauge when i'm going slower speeds with the A/C on. It does have to be like 90*+ outside though for it to get like that. Highway cruising is fine though.
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post #15 of 19 Old 06-24-2010, 04:29 PM
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Quote:
Originally Posted by Flounder View Post
Thermostat probably sticking or the temp sensor going out, my money on thermostat
thermostat bad SHOULD get stuck open and just take longer to reach operating temp

Quote:
Originally Posted by cruzcode View Post
LMAO!!! Dirt in the radiator fins, hah! Well, I guess you would know!!!

RC
I dont know what you would be refering to

Quote:
Originally Posted by medcop View Post
Runs a little cooler on the highway w/o AC, radiator is clean...made sure of this when I put the SPAL in.

Thermostat.... will change that out, cheap and easy to check / replace.

It only does it on really hot days, 95 degrees plus is when I noticed it. Drove it hard on the highway 80mph + the other day running A/C on high and it never got much over half, outside temp 80-85.

What could the A/C problem be?
If it still runs hot past the half way mark without the a/c on, it IS the radiator being blocked I guarantee it, you might think you got it cleaned good but I've thought that also and wound up the only way to get it clean enough was to remove it from the jeep, you'll be able to get the ac condenser good then too. I've had another member do the same thing, removing and cleaning his out fixed it. Like I've said before the stock radiator SUCKS, fins are to close together, get a little dirt in there it clogs up easy.

https://www.jkowners.com/forum/showthread.php?t=28600
these were taken after I tried hosing it off in the jeep, doesnt look to dirty in the jeep right




my griffin cleans out a LOT easier, more space between the fins. I've never had to pull it to clean it and actually have only had to clean it a few times verse cleaning the stock every other time in the mud once it got a little dirty.


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Quote:
Originally Posted by Dancin Dan View Post
A Jeep just zipped past my house and I could swear I heard the driver yellin:

"The tkob is coming!! The tkob is coming!!"
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post #16 of 19 Old 06-25-2010, 12:13 AM Thread Starter
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Hmmm... some good trips to Bonita should fix it if it is dirt...lol.

Anyway...will pull it off this weekend just to check, and it can't hurt.

Is there a replacement / aftermarket radiator for the JK?

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post #17 of 19 Old 06-25-2010, 12:23 AM Thread Starter
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Fan is installed correctly (puller fan)

It was not doing this until after my stock fan took a crap on the last trail ride. The fan actually went out before the mud holes.

I am going to pull the radiator this weekend and make sure that it is clean as well as change the thermostat.

This only occurs on very hot days 95 degrees plus on the highway, say approx over 70mph. If I keep it around 60 or so it does not move the gauge up to the 3/4 mark.

When driving around town or sitting at idle with the A/C on high (recirculation) it does NOT overheat. The fan does ran at the high speed...lol..the SPAL sounds like a jet engine when running on high.

I suspect that my radiator is probably clogged, but "looks" clean from the outside. It is not that big of a job to pull it and give it a good cleaning.

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post #18 of 19 Old 06-25-2010, 12:24 AM Thread Starter
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Quote:
Originally Posted by JDodge View Post
Medcop- I'm still having some issues with mine as well since our last mud trip. The fan is working ok(just loud as shit), but mine seems to only get over 1/2 on the temp gauge when i'm going slower speeds with the A/C on. It does have to be like 90*+ outside though for it to get like that. Highway cruising is fine though.
My stock fan started to work again, but it was not working to the full capacity that it was supposed to function. I suspect that your stock fan is on its last leg.

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post #19 of 19 Old 06-25-2010, 12:28 AM
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Quote:
Originally Posted by medcop View Post
Hmmm... some good trips to Bonita should fix it if it is dirt...lol.

Anyway...will pull it off this weekend just to check, and it can't hurt.

Is there a replacement / aftermarket radiator for the JK?
Yes, Griffin makes a replacement. Heres the link..

http://www.polyperformance.com/shop/...s-p-21211.html
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