Join Date: Aug 2000
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Re: Possible cracked block?
It's a good chance a gasket is messed up or a hose clamp isn't tight. When you put the t-stat in did you put the thermostat into the housing then put the gasket in? My buddy just had that happen to his blazer and it leaked pretty good. The easiest way to check is to turn your engine on, open the hood and see if you can see where it's leaking from.
If you don't see any leaks go to auto zone and rent a coolant pressure tester, they go on the raiator cap and you pump them up a couple pumps (i can't remember the psi but they usually have it marked on the gauged), it pressurizes your cooling system and you can see exactly where it's leaking. It should take maybe a minuet to diagonise and i'd say it's probably about a 95% chance it's either a messed up gasket or a hose clamp that just isn't tight enough. If it's a hose clamp it should take 30 seconds to fix, a t-sat gasket is either 1 or 2 hose clamps and 2 bolts, pull the old gasket off, clean it off, put the t-stat in, put the paper gasket on, slap some rtv on tighten her up and call her done.
Is your jeep sitting in missouri or IL? If it's in missiouri does it even get much colder than 32*? Are you running 50/50 antifreez water in there? If it isn't below 32* (probably has to get much colder than that) and your running 50/50 you block shouldn't have cracked yoiur block just sitting there. Post back and let us know what it is. If you are too lazy to open your hood and look i'd say take it to a general repair shop that does everything from oil changes to engine re-builds though i know the merlins i worked at did have a coolant pressure tester.