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A person who fix cars had first told me I had a freeze plug problem then he called back and SD my block was crack what should I check myself to make s Sure my block is crack it's a 1987 Chevy caprice

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  • Cars & Trucks Master
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A good trick is to dry area where coolant leak.
take a spray can of foot powder ,, spray it where it seems to leak
start engine to normal temp. look for a trace of leak you will see the crack if there is one.
hope it helps

Posted on Mar 22, 2014

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1 Answer

Does this mean that the freeze plug blew out and if so how do I find it and fix it


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Overheating and loss of coolant is a hint. Cracked blocks are very rare, cylinder head leaks are not.

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Hello Elizabeth,If it has a cracked Block or the sleeve has slipped getting the air out of the water is not going to help.But you do not have to use sodinm to get the air out because it is not going to work.But most of these cars has bleeder plugs on them and they are useual on the thermostat housing and the heater hoses and you can losen them up a you fill it up with anti freezeand keep a watch on the bleeder plug as you fill and when you see the anti freeze come out of the bleeder plug thighten it back up and finish filling and you should have all the air out of it.

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What and where is the freeze plug(s)..Is it costly to repair, can i do it? Do I NEED TO replace the radiator, it is a 1995, and has no major repairs? Also in solving my heat problem, and I find it is the...


Well the so called freeze plug as you call them is called a CORE plug as when the block is cast in steel/ iron or what ever the core plugs are there to wash out all the Sand and then put in Brass plugs which come out when freezes up,and they are in the block and in the heads Just fill with water and see were it leaks from either side if block or rear of block or in the heads under camshafts.
The block ones you can do yourself by knocking IN and then pulling them out with a big screwdriver but some are a bugger to get at
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No you dont need a new radiator or heating coil
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Check your coolant to see how low a temp it's good for. What u are describing is the failure of a freeze out plug. They are there to protect your block and head from cracking in cold weather, if you don't have sufficient anit-freeze protection (old anti-freeze, or not enough anti-freeze). If the water in the engine freezes, the freeze out plugs are designed to be a weak point, popping out to relieve the pressure of the freezing water, hopefully saving the head and block from cracking. The other reason for failure is corrosion due to, again, insufficient or old anti-freeze. To remove, u just need an old screwdriver and hammer, knock a hole in the plug w/ the screwdriver, pry it out. Clean up opening, install new one w/ block of wood and hammer. Of course, the location of the freeze out plug is what determines how much room u have to do this, so u have to decide if it's easier to pull the engine, or remove the head. It would be wise to pull the engine, and change all the plugs as angelo63 suggest, when done flush the system, adding a 50/50 mix of anti-freeze/water.

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