robfg67 Posted Saturday at 01:42 PM Share Posted Saturday at 01:42 PM Recently, I've noticed that the coolant bottle has been running low and I can smell coolant with the hood open. It doesn't overheat, the temp gauge is always below 210, no work on system recently, no coolant on the oil dip stick, and the system is (has been) in great condition. It's a 1990 with the 4.0L and the AW4 transmission. I warmed it up this morning and looked all around with a light and I can't find the source. Can someone recommend a pressure test kit that works with my Renix coolant bottle? Does the Harbor Freight PITTSBURGH Radiator Pressure Tester Kit work? I'm asking about this one because I can pick it up locally. Link to comment Share on other sites More sharing options...
Eagle_SX4 Posted Saturday at 01:50 PM Share Posted Saturday at 01:50 PM I had a similar issue recently. It turned out my cap had cracked and was leaking. Definitely check your cap for cracks. Link to comment Share on other sites More sharing options...
AnotherOldJeepGuy Posted Saturday at 01:51 PM Share Posted Saturday at 01:51 PM A place to start.. https://comancheclub.com/topic/74577-diagnosing-engine-overheating/?do=findComment&comment=780774 [Paragraph 2 - cap leak] Link to comment Share on other sites More sharing options...
robfg67 Posted Saturday at 02:59 PM Author Share Posted Saturday at 02:59 PM Just checked cap and it's fine. This Jeep only has 36k original miles on it, so although still 35 years old, it's in great shape. Link to comment Share on other sites More sharing options...
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