94 Roadmaster rust under passenger carpet - Chevy Impala SS Forum
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post #1 of 15 (permalink) Old 01-31-2016, 01:31 PM Thread Starter
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94 Roadmaster rust under passenger carpet

Guys,

when I today lifted off the floor carpet of my RMWagon on the passenger side, I found frightening some brown epidemic on the front RH side in the region of the A-pillar at the doorsill. First i was scared about rust Perforation, but when checking properly its not through. Theres a small sheet metal clamp which fixes the cabel channel, this clamp is dissipated by rust and caused a terrible look, but no welding is required, just cleaning, derusting and sealing.

But what Im much more interested in is the reason of the moisture which might be present for sure. I own the car since 4 weeks now and didnt move it in traffic at all, but when I took it home for 250 miles I realized a coolant smell inside what disappeared for some time and came back again, maybe quarter-hourly. I`ve heard by some rumours that moisture occuring on Buicks RM/ Chevys Caprice exactly in this area is well known by the experts and the reason can be the heater core or the A/C? Could anyone tell me the reasons and problems to supress this problem? The car is inside stripped down and everything would be nice to get at.

Thanks lot for your help!

Udo
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post #2 of 15 (permalink) Old 01-31-2016, 04:01 PM
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A leaking heater core is the most likely cause for the symptoms you describe.

Search heater core removal, and "the bolt".

THE BOLT is in the back of the HVAC drain pan, right up near the firewall, in a difficult location to reach.

I forget the size, I think a 5.5mm socket. I attached it to this:

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Check eBay for the OEM heater core, MUCH BETTER. I think someone on the forum here was selling one recently.

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 #3 of 15 (permalink) Old 01-31-2016, 04:05 PM
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I forgot, there's a drain that goes from the forward side of the HVAC drip pan through the firewall. It may have come loose. I'd check that first before pulling everything apart.

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 #4 of 15 (permalink) Old 01-31-2016, 04:06 PM
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Oh wait, you smelled coolant... DUH.

Never mind, pull everything apart...

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post #5 of 15 (permalink) Old 02-01-2016, 09:56 AM Thread Starter
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@ocala,

what means DUH? (Remember Im German )

Anyway, lots of thanks for your help. Should I just drain the heater core or have I to drain the whole engine coolant?

BuickRM
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post #6 of 15 (permalink) Old 02-01-2016, 10:17 AM
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duh
də/
exclamationinformal

exclamation: duh
  1. used to comment on an action perceived as foolish or stupid, or a statement perceived as obvious.
    "I left the keys in the ignitionduh!"



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post #7 of 15 (permalink) Old 02-01-2016, 11:26 AM
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@ocala,

what means DUH? (Remember Im German )

Anyway, lots of thanks for your help. Should I just drain the heater core or have I to drain the whole engine coolant?

BuickRM
I would detach the hoses from where the heater core comes through the firewall. Possibly secure them in the up position so you don't loose all of your coolant.

Then when you have the core ready to remove just try to hold the ends up as you remove it.

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 #8 of 15 (permalink) Old 02-01-2016, 01:16 PM
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Quote:
Originally Posted by BuickRM View Post
@ocala,

what means DUH? (Remember Im German )

Anyway, lots of thanks for your help. Should I just drain the heater core or have I to drain the whole engine coolant?

BuickRM
There's nothing here in this post that would indicate you are German. Please fill out your user profile to include that information. That might help.

But to answer your question, I agree with others, that sounds like a heater core leak. It's also a good idea to verify that your Air Conditioning evaporator drain is actually draining out of the passenger compartment through the passenger side firewall. The problem could be a combination of the two, so double-check.

Gene Beaird
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post #9 of 15 (permalink) Old 02-01-2016, 02:12 PM
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Udo

Make it easy on yourself, remove the front passenger seat. Find a piece of carpet or cardboard to cover the studs that hold the chair.

Also, where the heater hoses connect to the heater core, you may find them "baked" on, on top of being somewhat hard to get at. Rather then waste a lot of time, I have cut the heater core lines coming out of the firewall with a hacksaw blade. Saved a lot of aggravation.

Tom

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1994 Caprice Wagon---never seen winter 105,000
1996 Cadillac Fleetwood---never seen winter 65,000
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post #10 of 15 (permalink) Old 02-01-2016, 04:02 PM Thread Starter
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Thanks a lot to all, really good advices, my seats are removed already to check the floor for rust prevention. Think I will find the leakage next weekend. Obviously my English was good enough to hide me as a German

Udo
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