Antifreeze on my floorboard. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Pl4yboy · 02-07-2009, 04:06 PM

Okay, I just pulled the original 350 I blew ad put in a brand new crate. I never noticed this before this happened, but now I have antifreeze leaking on my passenger floor from inside. It seems to have two leaks, one from the firewall and one from a missing screw on the plastic. I noticed once before (about this time last year) that it there was smoke coming out of my vents when i turned on the heater. I drove home and by the time I was home, it was fine and never had the trouble again. The truck sat for a month and a half before I got the motor in and now it's doing it very regularly even when the heat isn't on. There is a very nasty oily film popping up on everything after it happens. I didn't touch the heater core or anything during the swap. The motor side of the firewall is fine too, with no leaks. I'm thinking this is either a bad heater core or something is leaking on the interior. Is there any possibility this could be the A/C? I'm doubting that. Any ideas guys? I can get pictures any time.

Kayotic · 02-07-2009, 04:15 PM

Did you smell sweetness when the smoke was coming through the vents?

Perhaps a change in fluid level exposed a weak point in the heater core.

Pl4yboy · 02-07-2009, 04:18 PM

Quote:

Originally Posted by Kayotic

Did you smell sweetness when the smoke was coming through the vents?

Perhaps a change in fluid level exposed a weak point in the heater core.

Yeah it's definitely not just random smoke. It's antifreeze for sure.

7DEETWO · 02-07-2009, 04:53 PM

The same thing happened to mine. A small crack on the heater core caused when moving the in lines out of the way during the engine work. Small price to repair, however it is a pain in the a** to remove.

71swb4x4 · 02-07-2009, 06:03 PM

I agree that it's the heater core. I have done my non-AC truck, but never an AC truck. Mine was pretty easy to do.

Pl4yboy · 02-07-2009, 06:39 PM

My truck is a factory A/c truck, so looks like it'll be pretty difficult. Oh well, it'll be a small price to pay. I'm sick of cleaning my windshield every 5 miles at night because I can't see the road when headlights meet me. I guess a $25 fix and a case of beer should do the trick. Thanks for the input guys. I'll let you know how it goes in the next few days.

**El Jay** · 02-07-2009, 06:42 PM

I'm not a real big proponent of it, but you may want to try a tube of "AlumaSeal" 1st.

Larry S · 02-08-2009, 12:44 AM

Its your heater core. You might as well break down and replace it. You can do it.

Wreckless_71 · 02-08-2009, 03:46 AM

Literally just fixed mine. Non A/C truck so it wasn't too bad but basically you have to pull the wheel, and unbolt the inner fender (pray the bolts aren't rusted to the nuts lol) and then it's pretty straight forward... The only thing is the cable on the inside of the box and getting the thing airtight again...

02-07-2009, 04:06 PM	#1
Pl4yboy Freeeeee Mason... Join Date: Sep 2006 Location: McAlester, Oklahoma Posts: 320	Antifreeze on my floorboard. Okay, I just pulled the original 350 I blew ad put in a brand new crate. I never noticed this before this happened, but now I have antifreeze leaking on my passenger floor from inside. It seems to have two leaks, one from the firewall and one from a missing screw on the plastic. I noticed once before (about this time last year) that it there was smoke coming out of my vents when i turned on the heater. I drove home and by the time I was home, it was fine and never had the trouble again. The truck sat for a month and a half before I got the motor in and now it's doing it very regularly even when the heat isn't on. There is a very nasty oily film popping up on everything after it happens. I didn't touch the heater core or anything during the swap. The motor side of the firewall is fine too, with no leaks. I'm thinking this is either a bad heater core or something is leaking on the interior. Is there any possibility this could be the A/C? I'm doubting that. Any ideas guys? I can get pictures any time. __________________ Daily Driver -2007 Chevy -Dark Blue Metallic -Regular Cab -4.8 V8 -4x4 Ongoing, Never Ending, PITA, Love of my Life -69 Chevy C/10, Camper Special -350/TH400 -Loudest System on the Board Last edited by Pl4yboy; 02-07-2009 at 04:17 PM.

02-07-2009, 04:15 PM	#2
Kayotic Registered User Join Date: Mar 2008 Location: Lawrenceville, Ga Posts: 300	Re: Antifreeze on my floorboard. Did you smell sweetness when the smoke was coming through the vents? Perhaps a change in fluid level exposed a weak point in the heater core. __________________ Atlanta Craigslist Hurst Indy Pickup Truck 3-Speed Shifter - 5010016

02-07-2009, 04:53 PM	#4
7DEETWO Registered User Join Date: Nov 2007 Location: RANCHO CUCAMONGA, CA Posts: 73	Re: Antifreeze on my floorboard. The same thing happened to mine. A small crack on the heater core caused when moving the in lines out of the way during the engine work. Small price to repair, however it is a pain in the a** to remove.

02-07-2009, 06:03 PM	#5
71swb4x4 Senior Member Join Date: Nov 2003 Location: Brookings, SD Posts: 10,497	Re: Antifreeze on my floorboard. I agree that it's the heater core. I have done my non-AC truck, but never an AC truck. Mine was pretty easy to do. __________________ Some people are like slinkies, they aren't good for anything, but you can't help but smile when you see one tumble down the stairs.

02-07-2009, 06:39 PM	#6
Pl4yboy Freeeeee Mason... Join Date: Sep 2006 Location: McAlester, Oklahoma Posts: 320	Re: Antifreeze on my floorboard. My truck is a factory A/c truck, so looks like it'll be pretty difficult. Oh well, it'll be a small price to pay. I'm sick of cleaning my windshield every 5 miles at night because I can't see the road when headlights meet me. I guess a $25 fix and a case of beer should do the trick. Thanks for the input guys. I'll let you know how it goes in the next few days. __________________ Daily Driver -2007 Chevy -Dark Blue Metallic -Regular Cab -4.8 V8 -4x4 Ongoing, Never Ending, PITA, Love of my Life -69 Chevy C/10, Camper Special -350/TH400 -Loudest System on the Board

02-07-2009, 06:42 PM	#7
El Jay Gone to greener pastures Join Date: May 2007 Location: Gateway to the Delta Posts: 7,354	Re: Antifreeze on my floorboard. I'm not a real big proponent of it, but you may want to try a tube of "AlumaSeal" 1st. __________________ '69 Chevy 1/2 T LWB Stepper: Daily Beater '72 GMC 3/4 T Fleet: Another Daily Beater '72 Plymouth Gran Coupe: ? "Ah women. They make the highs higher and the lows more frequent." Friedrich Nietzsche "Never kick a fresh turd on a hot day." Harry S. Truman GUN CONTROL: Never having to say, "I missed you." Always fire two warning shots into your attacker's chest area before putting a bullet between his eyes. Paraphrased from Louis Awerbuck

02-08-2009, 12:44 AM	#8
Larry S Registered User Join Date: Sep 2008 Location: Gainesville Ga Posts: 210	Re: Antifreeze on my floorboard. Its your heater core. You might as well break down and replace it. You can do it.

02-08-2009, 03:46 AM	#9
Wreckless_71 Registered User Join Date: Apr 2007 Location: Kelso, WA Posts: 363	Re: Antifreeze on my floorboard. Literally just fixed mine. Non A/C truck so it wasn't too bad but basically you have to pull the wheel, and unbolt the inner fender (pray the bolts aren't rusted to the nuts lol) and then it's pretty straight forward... The only thing is the cable on the inside of the box and getting the thing airtight again... __________________ 1972 K10 4" lift, 35’s, 383 stroker, 700r4, current project. 1971 C10 3"/5" static drop, 355/350. "La Bamba.” The current daily driver.



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