Question about 1991 Mitsubishi Montero

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Where are the plugs on the side block to flush it out?

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If you're referring to the freeze plugs they are hidden under the exhaust maifolds on the 3.0 V6. From my office I don't know your situation but I have never been a big fan of flushing out engine block (coolant flushes) Often times the flushes will kick up fine debris that has been lying within the block. If ALL of the debis is NOT cleared these particles will circulate within the cooloing systems and will, with time, take out the mechanical seal on your water pump; about a 5 hour fix as its driven by the timing belt. If your having big cooling issues with the block then ok I'd have at it but otherwise I'd stick to cleaning up the radiator, replacing the hoses and keep a fresh antifreeeze mix in the system.

I hope this may have assisted you,

Posted on Jun 06, 2010


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They will power backflush it with a large volume to remove trapped debris.
Before taking it tio the shop, if it were mine, I'd flush the entire cooling system first.
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If your heater is doing a fine job,it means it isn't plugged at all and so exclude it from this flush by
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Theres no such thing as a diagram, here are the draining instructions, hope this helps...
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    Under the car it looseing antifreeze a freez plug is how to replace and want look like. 2002 chrysle concorde with 2.7

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    This is due to water in the coolant system freezing, due to poor coolant system maintenance. The freeze plugs pop out when the frozen water expands preventing the freezing water from cracking your block.You would be money ahead to drain/flush your system and refill with all new 50/50 antifreeze of the type recommended for your vehicle. NEVER put water in your cooling system! Use only in emergency, fix problem then drain and refill with 50/50 coolant! This will prevent this problem from reoccurring and damaging other cooling system components.

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    There are no plugs in the block. You need to leave the radiator plug open and run the engine with a water hose running in the radiator. Keep a close eye on the temp. This will clean the system as good as you can with out major work. Good Luck

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