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Greasy handed
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53 Posts
Discussion Starter · #1 ·
I found a puddle under my car for a while after driving and assumed it was airconditioning. Then my car overheated on the drive home and i found the radiator mostly empty. I added some water and got it home. It appears that there is a leak from the hose that is behind the hose from that goes from the engine block to the radiator. The hose goes from just behind this main coolant hose back towards the firewall where it then transitions to a solid metal hose to enter the firewall. It looks like a mechanism or valve also in this area. I am assuming it is associated with the heat or airconditioning. I drove it down to the local auto parts but it was not leaking during that time. So I drove back up the hill with the airconditioning on and it was dripping from that area when I stopped I am not sure if the AC had anything to do with it or just the thermostat opening.

What is this hose? Should I just replace it and see if that fixes it? I am pretty sure I replaced all hoses about 2 years ago.
 

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AW Detailing Wanker
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16,287 Posts
That valve is what the temperature control on your HVAC unit operates. Controls the flow of coolant to the heater core inside the cabin. Replace it, bleed the system and you should be good to go.
 

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Greasy handed
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53 Posts
Discussion Starter · #4 ·
That valve is what the temperature control on your HVAC unit operates. Controls the flow of coolant to the heater core inside the cabin. Replace it, bleed the system and you should be good to go.
Okay I finally got to working on this. I just replaced the the hose I thought was leaking and replaced fluids and it seemed to be working. No prob until the other day. I parked at home and could hear hissing. I opened the hood and found radiator fluid in the form of steam and bubbling fluids from what appeared to be the actual engine block in this area. I took a video with my cell but cant figure out how to post it or even get it off my phone to my computer.

It appears to be coming out of the engine block near where the main radiator hoses exit. I have not even restarted the car since then. What area should I inspect when I open the hood and start it up tomorrow?
 

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Greasy handed
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53 Posts
Discussion Starter · #5 · (Edited)
Okay here is the video.

2012 09 16 14 05 12 477 - YouTube

I have since driven it and it is running okay down the street to the parts store so I can fix my other car, but when I tried to drive one mile further the temp would go from nothing to 40% almost right away and when I dove home the one mile the car was hissing again when I pulled up to my home. Any suggestions on where it is coming from?
 

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AW Detailing Wanker
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16,287 Posts
Ok, you're probably dumping coolant out of the bleeder valve which isn't even there. Where the radiator hose goes to the block you see that bolt sized hole? There is supposed to be a valve there that, when loosened allows you to bleed the coolant by making a small hole at the high point in the coolant system (where air will collect). When that valve is tightened it closes off that hole so the system is sealed. Without that valve there is a giant leak in the coolant system that will just dump coolant out of it and thats what you're seeing all over the engine block.
 

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AW Detailing Wanker
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16,287 Posts
As long as the gasket was good, I've never had to put RTV on the thermostat housing...
 
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