Perform this test and report results.
Quote:
Jeep CRD Head Gasket Cold Engine Leak Test Procedure:
1. Engine off, engine cold preferably from setting overnight.
2. Remove the coolant reservoir cap located on top of the expansion tank to release any existing pressure that is still in the system and then replace the coolant reservoir cap tightly.
3. Start the cold engine and let it run for no more than 60 seconds, then shut engine off.
4. Remove the coolant reservoir cap on top of the expansion tank again and listen closely and be attentive to note if any pressure escapes from the reservoir. Even the most miniscule amount of built-up pressure escaping from the coolant system would indicate a head gasket leak or a possible cracked head.
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Supporting Vendor and Moderator of LOST05 Jeep Liberty CRD Limited 
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