coolant loss - Chevelle Tech
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post #1 of 8 (permalink) Old Jan 5th, 19, 12:03 PM Thread Starter
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butch
 
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coolant loss

hi all , im loosing coolant somwere on my 86 gmc , there are no leaks anywere, no white smoke out exhaust , could it be intake gaskets its on a sb 305
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post #2 of 8 (permalink) Old Jan 5th, 19, 12:11 PM
 
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check your engine oil and if it’s an auto the atf fluids. Make sure they don’t look like milkshakes. This would rule out a gasket leak on the engine or a cooler leak for the transmission.
Also check the cab for wet floors as it could be a heater core leak.

Does it loose a about the same amount after you top off the radiator?
If so it could be a leaking overflow bottle.
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post #3 of 8 (permalink) Old Jan 5th, 19, 12:29 PM Thread Starter
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Re: coolant loss

Quote:
Originally Posted by mcollins6 View Post
check your engine oil and if itís an auto the atf fluids. Make sure they donít look like milkshakes. This would rule out a gasket leak on the engine or a cooler leak for the transmission.
Also check the cab for wet floors as it could be a heater core leak.

Does it loose a about the same amount after you top off the radiator?
If so it could be a leaking overflow bottle.
it looses around a pint after 50 miles no leaks anywere ,and the over flow bottle is emty
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post #4 of 8 (permalink) Old Jan 5th, 19, 1:51 PM
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Re: coolant loss

Do a pressure test on your cooling system. Do a running test too to see if you are building combustion pressure in the cooling system. You can get test strips at the auto parts store to check the latter or you may actually see bubbles coming up through the coolant at the reservoir tank or while looking into the radiator cap. Sometimes you can put your hand over the opening while pinching the over flow tube and feel the pressure build. Don't get burned.
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post #5 of 8 (permalink) Old Jan 6th, 19, 7:44 PM
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Re: coolant loss

Use a extension mirror to look at the "weep" hole on the bottom of the water pump directly behind the WP pulley.It's not uncommon for the water pump to leak slightly at this area.This happens when the WP is on its last legs and its a warning that the water pump will fail soon.If it is leaking you will see a telltale streak going down towards the balancer pulley but may not see any coolant dripping.If this is the case, the reason you don't see the leakage is the pulleys throw the small amount of coolant as the engine is running and it gets flung away by the spinning belts & pulleys.
Not saying this is definately the problem its just something else to check and look at.
And another thing you can do is to park over a large piece of cardboard and look for antifreeze stains before you use the truck the next day.If you use a big enough cardboard piece the front tires will hold it in place.

John
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post #6 of 8 (permalink) Old Jan 7th, 19, 12:50 AM
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Re: coolant loss

Check the back of the head/intake on pass side. Coolant deadheads there and gaskets will leak, weep or blow. Common problem.
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post #7 of 8 (permalink) Old Jan 13th, 19, 6:45 PM Thread Starter
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Re: coolant loss

Quote:
Originally Posted by LevonH View Post
Check the back of the head/intake on pass side. Coolant deadheads there and gaskets will leak, weep or blow. Common problem.
levon u were dead on with info u gave me , i looked there and sure nuff there it was, not leaking real bad but i could see traces of antifreeze ill try and nurse it till spring no heat in garage
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post #8 of 8 (permalink) Old Jan 13th, 19, 7:19 PM
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Re: coolant loss

Butch, Glad you found it. I've seen guys use Bars Leak or the GM "Horse Pills" stop leak provide a remedy for quite a while.
No harm in trying that. Follow the instructions.

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