Mechanics

CHEVY COOLANT LEAK OVERHEATS !

1998 Chevrolet Blazer • 4WD Automatic • 196,250 miles

1998 Chevy Blazer S10

Have had coolant leaking from drivers side at back. First, changed themostat. Then water pump. Flushed through rad. All fine for awhile with small leaks. Then one day overheated to point of "Check gauges" coming on. Was going to pull over but temp gauge dropped within seconds back down to normal? Changed thermostat again. Since then, sometimes have no heat, then it comes on as normal-overheating has happened twice since this and once and awhile coolant will literally pour out until all gone. We have tried and tried to identify exactly where this leak is coming from but it seems to pool down and we cannot find the leak. Could it be the freeze plug, intake, please help. Oh, one other thing-sometimes the coolant reservoir is still full but rad has lost some. Also, where could we get the service manual for the coolant system on this model? Thanks in advance for your help and info.
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Angle1086
February 21, 2011.




Your loose heat due to low coolant. Have it checked for eithera bad intake gasket or headgasket. A pressure check will let you know. On this site there is a manula you can buy online for 3 days I think it is for a nominal fee. It is printable if you want to take longer.

Hmac300
Feb 22, 2011.
Hi hmac300,
Thank you for your quick reply. With it being a bad intake or headgasket, is this why we cannot see the leak? Also, how can we tell if the freeze plug is cracked? There are 2 on this blazer-is that correct?

Tiny
Angle1086
Feb 22, 2011.
There are freeze plugs in the cylinder head, the sides of hte engine and rear of engine. A pressure check should show where it is leaking.
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Hmac300
Feb 22, 2011.

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