Coolant pouring from AC drain? - Chevy Impala SS Forum
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post #1 of 13 (permalink) Old 04-23-2015, 12:27 AM Thread Starter
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Coolant pouring from AC drain?

Hey guys, I've been smelling coolant for a couple weeks now and just tonight leaving work I remote started my car, and walking up to it I noticed a puddle under the passenger side. Walked around and got down on the ground to check it out and coolant was actually pouring down the frame onto the ground. I traced it back to the port coming out of the firewall below and to the left of the heater core barbs. Does this mean my heatercore is bad? If it is that really blows because its less than 2 years old...

Also, I thought if it was the heatercore leaking it would leak into the car, but the passenger inside is dry.

'95 DGGM Caprice 9C1 - Flowmaster exhaust, CAI, 9C1 wheels/caps, stereo, alarm/remote start
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post #2 of 13 (permalink) Old 04-23-2015, 12:53 AM
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Heater core is shot.

Jim B.

'95 9c1, pcmperformance.com 93 tune, Dynomax Ultraflo catback, K & N box filter, LT4 KM, 160 stat, 3.08 Posi.
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post #3 of 13 (permalink) Old 04-23-2015, 01:06 AM Thread Starter
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Blah, had a feeling but hoping it wasn't that, like I said its less than 2 years old. It was an Advance or Autozone core so it figures. Is there a better option for a replacement? I'm still confused on how it comes out of that drain instead of in the car, where do they normally leak from?

'95 DGGM Caprice 9C1 - Flowmaster exhaust, CAI, 9C1 wheels/caps, stereo, alarm/remote start
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post #4 of 13 (permalink) Old 04-23-2015, 02:23 AM
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There is a tube that collects the AC condensate (water) and drains it outside. The coolant is simply taking the same path (it's designed to do that ... if you are lucky). Be glad ... once the coolant gets in your carpet, you will smell it for 50 years.

Pull your hoses off the core and loop them back temporarily till you fix it ... don't let it get worse.

AC Delco fits perfectly. Seems solid.
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post #5 of 13 (permalink) Old 04-23-2015, 06:28 AM
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I put a Delphi core in my '95 this past December. It matched the original core perfectly.

Scott Hollenbeck
Administrator, Mustang 428 Cobra Jet Registry
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post #6 of 13 (permalink) Old 04-23-2015, 10:34 AM
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http://pages.ebay.com/link/?nav=item...d=231455173075

This is for a 92. I used one in my 95 with no problems.

95 DGGM 396 Stroker, Eagle crank & rods, LT4 heads, LT4 intake, LT4 hot cam, Finish Line long tube headers, 2 1/2" exhaust, Big Baer brakes, 3.73 rear, Hotchkis lowering springs, Front and rear Hotchkis Sway bars, aluminum driveshaft, Metco aluminum boxed trailing arms, K&N, Gary's Cables, 42# Green Giants, T84's,T56 Magnum
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post #7 of 13 (permalink) Old 04-23-2015, 01:13 PM
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If your heater core is copper/brass, you can leak check it for holes, and solder it with some plumber's solder, rosin flux, and a propane torch. Just check it again before your reinstall it to make sure you got the leak, and did not create a new one. I did this to mine, and it has not leaked since.

This is old school, and we did it to radiators when they were made from copper/brass.

1991 OCC 461 (.030 over 454) BBC, 3.23 posi, flash to pass, drop spindles & springs, Impala rims, Hydroboost, Recaros, MOMO/wood SW w/QR, custom wood shift knob, Pioneer DEH P77DH
1992 OCC now with 5.7 tbi, DEH P77DH
For a parts list, check https://www.impalassforum.com/vBulle...ion-parts.html
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post #8 of 13 (permalink) Old 04-26-2015, 10:36 PM
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Best way to stop this from happening is to use a coolant that has an additives pack designed to protect brass/copper and high lead/low lead solder. Most coolant do little to protect these metals. Look for a coolant that contains molybdate.

If you like to run straight water, expect to do this again in short order.
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post #9 of 13 (permalink) Old 04-27-2015, 07:27 PM
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Quote:
Originally Posted by Viceroy View Post
Best way to stop this from happening is to use a coolant that has an additives pack designed to protect brass/copper and high lead/low lead solder. Most coolant do little to protect these metals. Look for a coolant that contains molybdate.



If you like to run straight water, expect to do this again in short order.

Any coolant you recommend in particular? I have a new BeCool aluminum radiator. I put in a new heater core, all new hoses, even a new overflow reservoir, new engine...

Point is, I can go in any direction with no compatibility issues. I bought a few gallons of BeCool coolant, because they double the warranty on the radiator if you use it.

Any advice appreciated, thanks.

95 DGGM 396 Stroker, Eagle crank & rods, LT4 heads, LT4 intake, LT4 hot cam, Finish Line long tube headers, 2 1/2" exhaust, Big Baer brakes, 3.73 rear, Hotchkis lowering springs, Front and rear Hotchkis Sway bars, aluminum driveshaft, Metco aluminum boxed trailing arms, K&N, Gary's Cables, 42# Green Giants, T84's,T56 Magnum
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post #10 of 13 (permalink) Old 04-27-2015, 07:35 PM
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Double warranty is a good thing. Let me check out their additive pack and see what it actually is. I'd expect a company that deals almost exclusively with old muscle cars and trucks to have a very comprehensive pack. Get back to you in a bit.
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