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Old 02-20-2012, 03:06 PM   #21
Becky
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Default Re: 2001 L300 Heater Core/Hose Leak

I bought new O-rings to fit the heater core. Now, it's not getting hot. The bottom line was hot, but the top line is cold (this is on the heater core). Does anyone have any suggestions as to what the trouble could be and how to fix it?

Thanks in advance.

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Old 02-20-2012, 04:31 PM   #22
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Default Re: 2001 L300 Heater Core/Hose Leak

Is the coolant level where it should be? Once topped and level, the cooling system purges itself as the engine runs whether the cap is off with the engine idling or while driving. This should purge any air in the heater core. If not then the heater core may be clogged.

Was this cooling system ever flushed, drained, and refilled? If not, do it and disconnect the heater hoses to flush the heater core manually, reverse flushing it to ensure crud hasn't built up over the years to block coolant flow. A normal flush of the cooling system when replacing coolant usually works and is the best time to check on heater operation to kill two birds with one flush while running plain water through the system. Keeping coolant longer than recommended tends to allow precipitation to form crud - a perfect way to block the heater core. Replacing coolant at recommended intervals ensures clean fluids flow unimpeded, pump lubrication, anti-freeze protection, and plenty of heat in winter.

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Old 03-22-2012, 04:54 PM   #23
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Default Re: 2001 L300 Heater Core/Hose Leaki

I know this is an older post but I'm having issues taking the disconnect clamp off...I've only seen two photos and I'm not seeing any sort of piece to push down on or pull up for a release...in the correct position (6o'clock) there does seem to be a slot where perhaps the connect used to be but I've turned it completely around to see it better ani cannot remove it. Any suggesttions?

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Old 03-22-2012, 06:14 PM   #24
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Default Re: 2001 L300 Heater Core/Hose Leak

Are you describing the exterior heater hoses in the engine area or inside the car?

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Old 04-24-2012, 08:17 PM   #25
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Default Re: 2001 L300 Heater Core/Hose Leak

I've got a leak in the exact same spot. 2001 lw 200 The Rt. Side Green one has a slow drip- half the expansion tank in 2 weeks. From what I'm hearing the fix is Either/ Or- a new hose and clamp the heck out of it or a #15 o ring if I can get it back in the quick connection? Took a lot of digging to get lots of answers in the forum since the HC has confused people on which hoses are where. Here's my leak. It gets angry if I poke it to much!



If I dont fix it right the first time, wife will kill me and we'll be down to one car!
thanks- Pat
Attached Images
File Type: jpg heater hose Quick Conet.jpg (17.0 KB, 71 views)

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Old 04-26-2012, 09:52 AM   #26
MGeorge
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Default Re: 2001 L300 Heater Core/Hose Leak

I'd try the O-ring fix first before anything - the L-series are very prone to this issue. Mine did that for awhile and like an idiot I spent at least $10 on coolant over the course of a few months and some rather gunked up towels soaking it up.

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Old 11-08-2013, 01:22 PM   #27
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Default Re: 2001 L300 Heater Core/Hose Leak

i had a leak at the quick clamp at the heater core, was a pretty easy fix. used a new O ring .68 cents from local hardware store.. so far so good.. thanks to all previous posts this really helped out a lot.

...
2011 Ford F150 EcoBoost

1987 Buick Grand National, 10 second street car with ice cold AC

2002 Saturn L200, 115,000 miles still runs strong... the gas saver

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Old 02-20-2014, 08:59 PM   #28
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Default Re: 2001 L300 Heater Core/Hose Leak

Just finished the leaky heater core drama, measured the RED 0-rings that came with the cheaper aftermarket core, looks like it is metric and should fit tighter than the home depot ones, its 24mm OD x 18mm ID x 3mm CS The ID is going to be just over 1mm (.042) tighter on this metric one than the 1" OD x .750 ID x .125 Depot special. Just found pack of Red ones ( think they are silicone for hotter temps) on Amazon for 3.50 SHIPPED for 10 pack now getting good clamps is another story

My firewall connections were not leaking so not sure if these are the same size as the heater core side ones? Hope we have someone that will need to change them and confirm

...
01 L300

Last edited by czechyour6; 02-20-2014 at 09:11 PM..

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Old 02-20-2014, 09:16 PM   #29
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Default Re: 2001 L300 Heater Core/Hose Leak

10 Pcs Red Silicone O Ring Oil Seals Gaskets Washers 24mm x 3mm
by Amico is what I found on the ole Amizon , not many other matches other than some from china on ebay

...
01 L300

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Old 05-18-2014, 05:46 AM   #30
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Default Re: 2001 L300 Heater Core/Hose Leak

I made a web page with clear pictures changing the heater core O rings on my 2002 Saturn L200. It's not hard, just messy. If your passenger side carpet is wet with antifreeze, it is probably just the inexpensive O rings.

This forum won't let me post a direct link until I have 15 posts, maybe someone else can do it. Meanwhile, change the "dot" for a "."

tinyurl"dot"com/m6bzwre

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Old 05-18-2014, 05:49 AM   #31
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Default Re: 2001 L300 Heater Core/Hose Leak

Ok, my apologies, but if I make 5 more posts then it appears I can then post links, photos, etc. Then I can help you fix your heater more easily, so bare with me a second.

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Old 05-18-2014, 05:50 AM   #32
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Default Re: 2001 L300 Heater Core/Hose Leak

almost there

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Old 05-18-2014, 05:51 AM   #33
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Default Re: 2001 L300 Heater Core/Hose Leak

this is 13 out of needed 15

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Old 05-18-2014, 05:53 AM   #34
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Default Re: 2001 L300 Heater Core/Hose Leak

14 / 15

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Old 05-18-2014, 05:54 AM   #35
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Default Re: 2001 L300 Heater Core/Hose Leak

sorry about that

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Old 05-18-2014, 06:00 AM   #36
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Default Re: 2001 L300 Heater Core/Hose Leak

There, now I can show you the rather easy heater core fix for my 2002 Saturn L200, with pictures:
http://www.dwdav.com/saturnheater/L200heater.html

I used regular O rings I found at Lowe's:



Be ready to catch the mess, even after draining the radiator.



Just lift the sides of the clip with your fingernails, try not to break it:


More instructions and pictures at the link :
http://www.dwdav.com/saturnheater/L200heater.html

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Old 05-18-2014, 06:07 AM   #37
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Default Re: 2001 L300 Heater Core/Hose Leak

Excellent pictures! And well done with a close up of the clamps holding each line to the heater core.

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Old 05-18-2014, 07:54 AM   #38
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Default Re: 2001 L300 Heater Core/Hose Leak

Wow! Those are the best "How-To" pictures I have ever seen on any site. Nice extreme close-ups that are well focused. I have only one suggestion to improve it. You don't have to drain the radiator to do this job. By opening the pressure cap and draining at the radiator you put a lot of air in the system. This means you will get much more coolant draining out when you break the connections at the heater core. By keeping the system sealed it sort of vacuum locks and only a little coolant drains out, maybe two or three cups.

One other trick for working under the IP on the passenger side. Remove the glove box and cut away the thin horizontal strip of plastic that remains (part of the dash/instrument panel) that would be below the glove box. You won't miss that piece, just make sure you cut it so the glove box will cover the cuts. This mod gives you a lot more working room.

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Old 05-18-2014, 10:08 AM   #39
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Default Re: 2001 L300 Heater Core/Hose Leak

I have another suggestion;
Make sure you are using high heat rated o-rings.

http://m.harborfreight.com/180-piece...not%20provided

Those thin aluminum pipes get really hot and can split regular o-rings.

I find that the viton are superior to hold up, just my 2 cents.

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Old 05-19-2014, 10:15 AM   #40
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Default Re: 2001 L300 Heater Core/Hose Leak

I'm down to about 20, but if anyone needs O-rings, PM me and I'll give you my address, you send me a SASE and I'l send you back 2 O-rings.

...
Jerry N

"Politics is the art of looking for trouble, finding it, misdiagnosing it and then misapplying the wrong remedies."

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