Where the heck did the coolant go? - Chevy Impala SS Forum
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post #1 of 14 (permalink) Old 06-10-2015, 03:57 PM Thread Starter
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Where the heck did the coolant go?

Ok, here's the vehicle parameters: 91 Chevy Caprice with the L03 (305 TBI.)

Lately I've noticed my coolant keeps getting low. I'm having to add a little coolant on an almost daily basis. There's no leaks under the car, no visible leaks at all. No water on the floor to indicate a heater core, and the water pump and thermostat were replaced last year.
Saturday i hadn't checked to coolant level for a couple of days and the car ran really warm, almost overheating. After i refiled it, it ran hot again for a few minutes, but then cooled back down.
I've been keeping it topped of since and it hasn't even run warm, but where the heck is my coolant going? I keep thinking head gasket, but my oil is clean. One of the shop mechanics thinks I maybe have just a tiny gasket leak and suggests using a block sealer... I don't know about that stuff...
Anyways I'll appreciate any input anyone has on the subject.

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post #2 of 14 (permalink) Old 06-10-2015, 04:14 PM
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Where the heck did the coolant go?

Check the inside of your tail pipe. It should not have a "greasy" feel to it. If it does there's a definite possibility it's going out the tail pipe. Still,better than going in the crankcase...

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post #3 of 14 (permalink) Old 06-10-2015, 05:15 PM
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wuts the ATF look like?

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post #4 of 14 (permalink) Old 06-10-2015, 06:00 PM
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Where the heck did the coolant go?

Oh,I hope not....Coolant will easily damage the frictions inside. Many no longer use the radiator's internal trans cooler for this reason...

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post #5 of 14 (permalink) Old 06-10-2015, 06:31 PM
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I'll lay odds it a heater core leaking. I just had the same issue with my 96 SS and sure enough the heater core started leaking AGAIN, this is now the fourth heater core in 3 years i've replaced.

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post #6 of 14 (permalink) Old 06-10-2015, 08:16 PM
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Where the heck did the coolant go?

Easy to find out...Bypass the heater core by connecting the hoses together,or with a separate hose. Coolant will suddenly stop disappearing if a leaking heater core is no longer supplied with coolant...

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Last edited by 1slow96; 06-10-2015 at 08:34 PM. Reason: clarification
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post #7 of 14 (permalink) Old 06-10-2015, 10:01 PM Thread Starter
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Quote:
Originally Posted by 1slow96 View Post
Easy to find out...Bypass the heater core by connecting the hoses together,or with a separate hose. Coolant will suddenly stop disappearing if a leaking heater core is no longer supplied with coolant...
AH. That's what I'll do. Thanx.

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post #8 of 14 (permalink) Old 06-11-2015, 05:27 AM
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Not mentioned yet

Look for shiny lime green stain at WP weep hole

or

Pinhole leak in hose, only manifests itself under pressure. Will also prompt higher temps by way of losing system pressure. To catch, must open hood immediately after driving under load and before hole has a chance to pucker up. If lucky will (not always) leave aforementioned faint green stain in the engine compartment where it is shooting under pressure.

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post #9 of 14 (permalink) Old 06-11-2015, 06:49 AM
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Check the hose at the rear top of the intake manifold. I had a slow leak there, and the liquid never made it to the ground. It also evaporated before I could find it.

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post #10 of 14 (permalink) Old 06-11-2015, 10:38 AM
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Thought it was an LT1. Sorry I misread it.

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