Hi all, low coolant light came on so I check reservoir and it was pressurized. Have about 153k miles and truck is running fine. Was hoping to get to 200k and do timing belt and ARP studs then. Have Factory Service Manual but need insight on what should be done while into the job to keep my Liberty on the road forever. Any info is always appreciated.

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2005 Silver Liberty CRD
Provent, 3.7 intake, K+N filter
ARP studs, Hemi pu tcm
In tank harness/fuel pump
Airtex rear bag, Fujimoto valve
Upgraded lifters, exhaust valves, fuel head
Florida torque converter, ID trans pump
Transgo shift kit, GM fan
2 micron filter, Bilstein shocks
Viscous heater delete

Was the engine warm/hot when you checked the reservoir? It'll always be pressurized when it's warmed up. But if it's pressurized 30 seconds after a cold start, that's probably an issue.

Get the head pressure tested for cracks.
Replace rocker arms.

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U.S. Army Retired

Flash, noticed in his signature it's a 3.7 gasser....

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Supporting Vendor and Moderator of LOST
05 Jeep Liberty CRD Limited
Ironman Springs/Bilstein/Shocks
Yeti StgIV Hot Tune
Week's BatteryTray
No FCV/EGR
Samcos/ProVent
SunCoast/Transgo
Carter Intank-pmp
2mic.Sec.Fuel Filter
Flowmaster/NO CAT
V6Airbox/noVH
GM11 Bld.fan/HDClutch
IronrockArms/wwdieselMount
98 Dodge Cummins 24 Valve

Isn't that just the airbox mod? Don't you have that too?

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'06 Lbrty Sprt CRD 150K

Sasquatch
DSS Turbo
CAT-elimntr
Weeks Stg1&2 EGRfix
PV-200
BLING
vent gauges

IDParts
head
cams
rockers
Timing set
ARP studs
eTn1 GX2123 5v GPs

YETI Custom Tune
Flowmaster 8325508
Carter P76611M
GM 12611872
Hayden 2986
GM 15976889
PATC Custom Billet
2010 Ram Hemi Trans
Sonnax 44957
Transgo kit
Cooper 51770

Yeah, I think he is missing a comma after his sig says "2005 CRD" where he starts the mods.

First things first - do the cold engine test. Release any pressure first, then cap it up and run the engine for 30 seconds to a minute. Letting it idle is fine. Then shut down and open the cap again. Any noise / hissing? Head gasket leak. No? Then you may have a leaking spring clamp - they don't last forever and if they are disturbed / opened for any reason, they are more likely to be weak.

The cold engine test has been conclusive for head gasket issues on every one that I've worked on. If you haven't had studs installed however, I would be leaning toward the factory bolts giving out - amazing they lasted this long. Unfortunately just replacing them with the studs (and not replacing the gasket) is starting to prove to NOT be successful after a leak has already presented itself.

I seriously doubt the head is cracked unless the engine has been badly overheated, but you will want to take the opportunity to replace the valves to prevent any possible sudden failure of those - you are in the range for that happening any day now, and it can happen without any warning.

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Proud supporting vendor of LOST Jeeps
TRAVELING CRD TECH. I come to you!
Need help? Just ask! I've taken it apart more than most.
Email jeep [at] maincomputer [dot] com - BOARD MESSAGING IS BROKEN
Over 225 CRDs currently driving with my valves, timing belt, rockers, or ARP Studs.
Bad noises = REALLY bad things.

My bad, you are right!

_________________
Supporting Vendor and Moderator of LOST
05 Jeep Liberty CRD Limited
Ironman Springs/Bilstein/Shocks
Yeti StgIV Hot Tune
Week's BatteryTray
No FCV/EGR
Samcos/ProVent
SunCoast/Transgo
Carter Intank-pmp
2mic.Sec.Fuel Filter
Flowmaster/NO CAT
V6Airbox/noVH
GM11 Bld.fan/HDClutch
IronrockArms/wwdieselMount
98 Dodge Cummins 24 Valve