overheat at low speeds with no power

3

3fifty

NAXJA Forum User

Location

delete

• Apr 3, 2009

• #1

While out crawling a few weeks ago the XJ overheated. I lost all power. It didnt want to move. I dont remember if the fan kicked on or not. Once I let it sit and cool the power returned.

Thermostat was replaced about a year ago.

Where do I start?

 

95' heep

NAXJA Forum User

Location

Chicago Land

• Apr 3, 2009

• #2

kinda sound like the jeep's running too rich.

when you revving the jeep, was there any black smoke coming out of the tailpipe?

 

3

3fifty

NAXJA Forum User

Location

delete

• Apr 3, 2009

• #3

I dont think so... The exhaust stops at the cat though so I probably wouldnt notice honestly.

 

joe_peters

NAXJA Forum User

Location

Grants Pass, OryGun

• Apr 3, 2009

• #4

Year and engine?

Stock cooling system?

 

9

962drrhino

NAXJA Forum User

Location

saratoga, ny

• Apr 3, 2009

• #5

does the cooling fan work?

 

3

3fifty

NAXJA Forum User

Location

delete

• Apr 3, 2009

• #6

'95 4.0
stock system

I believe the fan works ill check tommorow to be sure.

 

joe_peters

NAXJA Forum User

Location

Grants Pass, OryGun

• Apr 3, 2009

• #7

OEM cooling system marginal for offroading. If the coolant mix is good, the pressure is good, you might consider the following:

Consider a manual command switch so you can run the electric fan when it is needed.

Consider an upgrade of the fan clutch to the HD zj style.

 

B

birchlakeXJ

NAXJA Forum User

Location

Melrose, MN

• Apr 3, 2009

• #8

I'd check/verify fan clutch operation first. They are a common hardware failure.

What is the history of cooling system maintenance (flush/fill?). Gotta make sure basics are covered.

 

W

winterbeater

NAXJA Forum User

Location

Royal Oak, Michigan

• Apr 3, 2009

• #9

When it's hot, turn the engine off and try to turn the belt driven fan by hand. It should be very stiff when hot.