how hot is too hot

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Jul 22, 2011 | 07:46 PM

#61

djb383

CF Veteran

Joined: Nov 2009

Posts: 8,172

Likes: 17

From: The Republic of TEXAS

Year: 1998

Model: Cherokee

Engine: 4.0L HO

These folks seem to disagree with u in regard to multi-pass rad design. They recommend aluminum over copper/brass. Interesting read whether u agree or disagree. ScanGauge shows our OE type 1 row (1 1/4" wide tube) aluminum/plastic rad is working great.

http://www.stewartcomponents.com/tec...ech_Tips_5.htm

Last edited by djb383; Jul 22, 2011 at 07:49 PM.

Jul 27, 2011 | 11:43 PM

#62

jsholladay

Newbie

Joined: Apr 2011

Posts: 24

Likes: 0

From: Fresno, CA

Year: 1991

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by djb383

How hot is too hot?..........ECU turns efan on at 218F so my guess is that's where the engineers wanted things to start cooling down. If coolant temps are actually north of 222.5, a 180 t-stat would have no advantage over a 195 t-stat.....they're both wide open at 220+ and a properly functioning t-stat only controls MINIMUM coolant temp.

How old are cooling system components? The XJ rad is really dinky, everything must be in top notch condition.

you say the e-fan should come on around 218f, mine comes on between 223-235f. on the highway it stays between 210-215 but in traffic..... looks like im pushing 240. fortunately, it evens out before reaching the red. im thinking the temp control unit might be faulty.... any thoughts?

Jul 28, 2011 | 10:57 AM

#63

djb383

CF Veteran

Joined: Nov 2009

Posts: 8,172

Likes: 17

From: The Republic of TEXAS

Year: 1998

Model: Cherokee

Engine: 4.0L HO

My thoughts are, what has/has not been replaced regarding cooling system components. Gauge/sending unit/electrical could be an issue.....just gotta start checkin' things.

Jul 28, 2011 | 09:13 PM

#64

jndirksjr

Thread Starter

Junior Member

Joined: Jun 2011

Posts: 44

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Model: Cherokee

Amazon shipped me the wrong radiator. I got a single row aluminum instead of a 2 row. I sent it back and ordered a 3 row brass/copper.

Here's what's on the way now.

http://www.autopartswarehouse.com/de...QQCSF2671.html

Aug 7, 2011 | 09:51 AM

#65

jndirksjr

Thread Starter

Junior Member

Joined: Jun 2011

Posts: 44

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Model: Cherokee

I also have a Hayden 402 trans cooler on the way. I'm gonna bypass the rad trans cooler and use this aux unit for trans cooling exclusivly.

#402 on this sheet. 5" high and about 16" in length. That should be enough. http://www.haydenauto.com/upload/Hay...il-coolers.pdf

Aug 7, 2011 | 10:08 AM

#66

cdawall

CF Veteran

Joined: May 2011

Posts: 1,381

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From: EAFB, SD

Year: 1994

Model: Cherokee

Engine: 4.0 HO

Quote:

Originally Posted by jndirksjr

may not be the best idea to bypass the rad for cooling. its there for fast warm up during the winter. i have the stock external cooler and still go through my rad.

Aug 7, 2011 | 02:48 PM

#67

djb383

CF Veteran

Joined: Nov 2009

Posts: 8,172

Likes: 17

From: The Republic of TEXAS

Year: 1998

Model: Cherokee

Engine: 4.0L HO

Good/sound advice, use 'em both, factory rad cooler 1st, aftermarket auxiliary cooler 2nd.

Aug 7, 2011 | 04:30 PM

#68

stereodesigner

Seasoned Member

Joined: Aug 2011

Posts: 256

Likes: 0

From: Florida

Year: 1998

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by jsholladay

To be honest, What you should do (some people think its alot of hassle but its not a big deal) hook up a relay and a switch so you can switch the efan on when you need it, ive got a switch with a LED so there is no possibility of leaving it on (even though the fan itsself is loud as hell) I turn my efan on when my gauge even goes a hair over 210 and when the ac is on

Aug 8, 2011 | 08:09 PM

#69

jndirksjr

Thread Starter

Junior Member

Joined: Jun 2011

Posts: 44

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Model: Cherokee

OK,

Ill run through the factory rad cooler and then through the aux. Thanks for the advice.

Aug 8, 2011 | 09:20 PM

#70

jndirksjr

Thread Starter

Junior Member

Joined: Jun 2011

Posts: 44

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Model: Cherokee

BTW, what is the path of the fluid at the factory lines at the radiator? There's upper and lower connections at the radiator. Which line has fluid comming from the trans, the top or bottom one?