Go Back   Jeep Garage - Jeep Forum > Jeep Platform Discussion > Grand Cherokee - WJ > Troubleshooting/Problems

Join Jeep Garage Today
Reply
 
Thread Tools Display Modes
 
  #1  
Old 12-27-2012, 04:42 PM
Member
My Jeep: 2002 4.7L WJ
 
Join Date: May 2012
Location: South Australia
Posts: 39
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 855
jeepv8 is on a distinguished road
coolant loss

Hi fellow jeepers, i have a question i replaced my radiator recently and hoses radiator cap and found while at idle at operating temp is pressurizes and starts to leak from the radiator cap any ideas guys ? cheers pete
__________________

__________________
Reply With Quote
  #2  
Old 12-27-2012, 05:00 PM
Frango100's Avatar
Premium Member

My Jeep: 2004 4.7L WJ
 
Join Date: Dec 2009
Location: Brazil
Posts: 4,667
Thanks: 9
Thanked 56 Times in 54 Posts
Rep Power: 525477
Frango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond repute
Re: coolant loss

Did you check the radiator cap sealing surface on the radiator neck? When there is no damage (scratches, nicks, dents etc) to the sealing surface, then probably the radiator cap is bad.
Also did you check that the cap is completely screwed on? And are you sure it comes from the cap itself. I had it once myself, and at that time the liquid came out of the overflow hose, which had a very small crack at the end.
__________________

__________________
Frank

JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
Monroe Reflex shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.

VW Beetle 2.0 TSI 2013
My new toy
Reply With Quote
  #3  
Old 12-27-2012, 08:16 PM
Member
My Jeep: 2002 4.7L WJ
 
Join Date: May 2012
Location: South Australia
Posts: 39
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 855
jeepv8 is on a distinguished road
Re: coolant loss

Cheers Frank, its all around the neck radiator is very old and ordered cap through morris 4x4, will check it again, while i have you their, when at idle i have noticed the at idle the revs are starting to fluxuate up and down like from 800 rpm to 1000 rpm and on cold start up it goes straight to 1600 rmp for a second or two then drops humps a bit and then deciced to settle ? any ideas you can throw my way to check, Regards peter.
__________________
Reply With Quote
  #4  
Old 12-27-2012, 08:40 PM
Frango100's Avatar
Premium Member

My Jeep: 2004 4.7L WJ
 
Join Date: Dec 2009
Location: Brazil
Posts: 4,667
Thanks: 9
Thanked 56 Times in 54 Posts
Rep Power: 525477
Frango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond repute
Re: coolant loss

Hi Peter. This most of the time has to do with a TPS sensor which is starting to fail. Any rough shifting as well?
Could also be a dirty IAC (Idle Air Control) stepper motor/air passage on the throttle body. Since this last one doesnīt cost anything but some time, its maybe the better one to start with. Remove the IAC stepper motor (one connector and 2 Torqx srews, (number 25 i believe) and you have the stepper motor in your hands. Be carefull to not rotate the plunjer when cleaning, or you will end up buying a new IAC stepper motor. You probably will see a lot of black dirt on the plunjer, but also inside the throttle body air passage. Clean it all well, probably the best is to remove the complete throttle body to give it a good cleanup. If this didnīt help, you will (and this is most probably the case) need a new TPS. best is to buy OEM TPS sensor, since aftermarket can be crap and give more problems then solutions.
By the way, didnīt you mention in the first post that you just replaced the radiator?
In attached thread you will see some pictures on IAC cleaning: Lopey idle on an 02' Overland / 4.7HO
__________________
Frank

JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
Monroe Reflex shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.

VW Beetle 2.0 TSI 2013
My new toy
Reply With Quote
  #5  
Old 12-28-2012, 08:28 PM
Member
My Jeep: 2002 4.7L WJ
 
Join Date: May 2012
Location: South Australia
Posts: 39
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 855
jeepv8 is on a distinguished road
Re: coolant loss

Hi Frank , sorry i didnt explain that to well, i changed the radiator about 15,000ks ago but not the cap so i replaced the cap about a 1,000ks later,after checking what you said it was a dodgy radiator cap so thats all fixed. I have been trying to buy jeep parts here in South Australia but the dealer here is brutally expensive, for instance a track bar replacement here is around $500 aus dollars and no kits avaliable so i sourced one through Kevs offroad. i plan on pulling that IAC sensor today and see how i go and the link you sent i copyed off so i dont bugger it up.I let you know how i go, thanks again Frank the info is great and helpful, regards peter.
__________________
Reply With Quote
  #6  
Old 12-29-2012, 03:22 AM
Frango100's Avatar
Premium Member

My Jeep: 2004 4.7L WJ
 
Join Date: Dec 2009
Location: Brazil
Posts: 4,667
Thanks: 9
Thanked 56 Times in 54 Posts
Rep Power: 525477
Frango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond repute
Re: coolant loss

Same thing overhere, dealer prices are just insane. I normally buy my things at www.rockauto.com (mostly non OEM) or www.justforjeeps.com (for OEM parts)
Justforjeeps is a vendor overhere and gives discount, check out their thread.
__________________
Frank

JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
Monroe Reflex shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.

VW Beetle 2.0 TSI 2013
My new toy
Reply With Quote
  #7  
Old 12-31-2012, 10:11 PM
Member
My Jeep: 2002 4.7L WJ
 
Join Date: May 2012
Location: South Australia
Posts: 39
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 855
jeepv8 is on a distinguished road
Re: coolant loss

Thanks again Frank i will have a look at both links you sent, have a good new years, regards peter
__________________
Reply With Quote
  #8  
Old 12-31-2012, 11:11 PM
stashgto's Avatar
Member
My Jeep: 2008 3.7L WK
 
Join Date: May 2012
Location: Staten Island N.Y.
Posts: 719
Thanks: 0
Thanked 18 Times in 18 Posts
Rep Power: 109929
stashgto has a reputation beyond reputestashgto has a reputation beyond reputestashgto has a reputation beyond reputestashgto has a reputation beyond reputestashgto has a reputation beyond reputestashgto has a reputation beyond reputestashgto has a reputation beyond reputestashgto has a reputation beyond reputestashgto has a reputation beyond reputestashgto has a reputation beyond reputestashgto has a reputation beyond repute
Re: coolant loss

Don't forget that radiator caps come in different values make sure the new one is tha same as original. Sometimes I use my pressure tester on the radiator, and let it run to see how much pressure it's building up. If it gets high I'll do a test to see if it's a possible head, or gasket problem.
__________________
Reply With Quote
  #9  
Old 01-04-2013, 07:34 PM
Member
My Jeep: 2002 4.7L WJ
 
Join Date: May 2012
Location: South Australia
Posts: 39
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 855
jeepv8 is on a distinguished road
Re: coolant loss

cheers stashgto, i have checked with a tester and found no probs there ended up being a dodgy cap, regards peter
__________________
Reply With Quote
  #10  
Old 01-04-2013, 08:20 PM
stashgto's Avatar
Member
My Jeep: 2008 3.7L WK
 
Join Date: May 2012
Location: Staten Island N.Y.
Posts: 719
Thanks: 0
Thanked 18 Times in 18 Posts
Rep Power: 109929
stashgto has a reputation beyond reputestashgto has a reputation beyond reputestashgto has a reputation beyond reputestashgto has a reputation beyond reputestashgto has a reputation beyond reputestashgto has a reputation beyond reputestashgto has a reputation beyond reputestashgto has a reputation beyond reputestashgto has a reputation beyond reputestashgto has a reputation beyond reputestashgto has a reputation beyond repute
Re: coolant loss

That's great news Peter, take care Stan
__________________

__________________
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Coolant loss Frango100 Engine Performance/Intake/Exhaust 18 12-04-2011 12:05 AM
Coolant loss brent Troubleshooting/Problems 7 09-22-2011 11:35 AM
Loss of Power w/AC Bleeding Blue Grand Cherokee - WK 3 06-04-2011 10:54 PM
Loss of coolant n8jay Grand Cherokee - WK 3 05-18-2010 11:08 PM
Loss in MGP after new plugs Kaliber35 Grand Cherokee - WK 4 03-15-2010 11:29 PM

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 03:26 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community