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Old 01-12-2015, 01:20 PM   #1
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Where is the Leak?

After our recent cold spell, I noticed a leak under the front of the MH. It is reddish and feels slippery like oil. I'm not sure, but I think it is coolant. The photo shows where the leak is and in the close up you can see a couple of drops. It is only a slow drip, and even with the engine running I can't really see where it is coming from. Is this the heat exchanger for the heater and the hoses for hot water? I tested the freeze point of the coolant and it is good down to -10F so it should not be freeze damage. Our temp only got down into the mid teens. Is it just coincidence that this leak started after the hard freeze? Any ideas what it is and how to fix?
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Old 01-12-2015, 01:23 PM   #2
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Yep. That's the A/C "radiator".
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Old 01-12-2015, 04:01 PM   #3
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Not a coincidence its very common for things to shrink when cold ie hose clamp connection s. Get your screw driver out and start tightening your clamps.
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Old 01-12-2015, 06:03 PM   #4
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If it is coming out of the housing it is the heater core probably leaking. Hopefully it is dripping down from the clamps. That is what it looks like.
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Old 01-12-2015, 06:09 PM   #5
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YUP it's what's called a "cold leak" just tighten the 2 hose clamps to the heater core. It has nothing to do with the A/C unit located below.
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Old 01-12-2015, 06:14 PM   #6
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AS others have said...............if tightening the clamps doesn't stop the leakage then it's likely the heat exchanger. You will need to change it out. You can tie those two hoses together to bypass the heater core. You won't have heat but you won't have a leak either. Tighten those lamos before worming up the engine.
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Old 01-12-2015, 10:06 PM   #7
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I haven't had a chance to try tightening the clamps yet, I'm hoping that is all I need to do. Are those hoses under pressure? Just wondering if I should try to pull them off, clean them up and reseat them? Kinda hard to get to them so I don't really want to start something I can't finish.
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Old 01-12-2015, 10:11 PM   #8
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Quote:
Originally Posted by Glen and Sal View Post
I haven't had a chance to try tightening the clamps yet, I'm hoping that is all I need to do. Are those hoses under pressure? Just wondering if I should try to pull them off, clean them up and reseat them? Kinda hard to get to them so I don't really want to start something I can't finish.
When coolant is cold there is not any pressure to speak of. Don't take them off when coolant is warm or hot. If it's the clamp you can probably just tighten them. If any doubt renew the clamp with a better clamp.
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Old 01-13-2015, 10:55 AM   #9
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Good idea, a couple off the clamps look kinda bad. If tightening doesn't work, I'll get a couple new clamps
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Old 01-15-2015, 12:55 AM   #10
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If those are the original heater hoses it's time to change them. Even though the coolant hoses look good on the outside they deteriorate from the inside out. If the coolant hasn't been changed for a few year's it's due also.
If you remove the hoses to clean the nipples and replace the clamps you will lose some coolant.
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Old 01-18-2015, 09:46 PM   #11
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I had a chance to tighten the clamps today. The lower one was a little loose. Added some coolant and ran the motor for a while to get the temp up. Turned the heater on and off a few times and everything seems to be fine. I looked into replacing the hoses, doesn't look like it will be that hard of a job, but they look ok for now. Thanks everyone for the help.
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