What are these 2 hoses for ?
 

Hi guys I managed to tape the air duct where the air gets inside the cabin with aluminium tape. So the cold air is finally cold and not hot anymore.
But below I've been there are 2 hoses coming into the cabin. These 2 hoses are extremelly hot and don't know why. Cause the heater is not on. I think one of the hoses is for the heater. Do any of these 2 hoses work with the air intake for the cabin ? Or could be heating up the cabin air as well ?

http://oi58.tinypic.com/8yvrpv.jpg

They're coolant lines. They run in to the heater core for the HVAC system. It's perfectly normal for them to be there and hot, and it shouldn't be raising your in-cabin temperatures significantly, if at all.

Those are probably hoses to the heater core. The engine's coolant runs through there constantly, so I'd assume some heat would be getting into the cabin.

That's right. But why are they constantly so hot. I did wrap the air duct with aluminium tape like this guy did , and I started touching what was hot coming inside the cabin. So I wrapped these 2 hoses with aluminiumtape as well.. is it useful or not ?


http://oi58.tinypic.com/97tpub.jpg

uhh....because heater core?

#BecauseHeaterCore

hehh a new hashtag

Why is it hot? Because the heater core uses engine coolant (that is hot) to heat the cabin. Even if your heater core is turned off, the hoses will still be hot due to engine coolant heat soaking.

-alex

I was under the impression that the engine constantly fed hot water through the heater core, whether the heater was on or off. When the heater in the car is turned on, the blower then blows air through the heater core, thus heating the air for your consumption.

Thanks alex, so what if I cover these two hoses with aluminium tape will it help on anything? or it's useless. For heat disipation to avoid innecesary heating insdie the cabin .. cause I could manage to solve the cold air issue being hot .. covering the air duct with aluminium tape not entirely cause air is not really ambient cold cold but at least it's something.
But I noticed these hoses being too hot. By the way one is the heater hose and the other one which has like a tip on top ?

IF it's like you say this is terribly badly designed. Casue it shouldn't be letting the coolant from the engine inside the cabin if you do not require it. shouldn be like tihs?

It's completely useless. It won't do a single thing for you inside the cabin.

One hose has a screw on top because that is a bleed valve, for when you need to flush your coolant system.

-alex

I don't have a copy of the FSM section that shows heater/AC operation, but most cars I've seen has a valve that "opens" to allow engine coolant to pass through. Otherwise, it remains closed.

If it constantly passed coolant, the passenger compartment would just heat soak by itself over time since there's a functional radiator inside the cabin. But that is obviously not the case.

-alex

Hope is like you say.. that's closed when you do not require it. It's useless to cover these hoses with aluminium tape ?

Useless, since the heater hose is in the engine bay and before the firewall.

[ame="http://en.wikipedia.org/wiki/Heater_core"]Heater core - Wikipedia, the free encyclopedia[/ame]

-alex

Great, thanks alex. So I shouldn't worry in our FRS there's a valve opening and closing. It's just hot cause it's the hose entrance and fluid is circulating.
Being so hot at touch means at that point of the entrance it's being blocked?
By the way do you have the service manual pdf handy ? cause the one I got doesn't have index. I think I got it from the sticky, is there just one ? it's got aboout 4000 pages

Just tear all the plumbing out right now. You'll start asking about that eventually.

I don't have the sections of the manual you want, I only have what everyone else.

As for your questions on the hose, all I can say is "don't worry about it". The hose is the same temperature as the rest of the coolant hoses (try touching the large upper radiator hose, same temp!).

If you feel the temps in the car are excessive even when you have the AC off and temperature dial set to cold, you should have the dealer inspect the car. It may very well be a case of a malfunctioning sensor or a bad valve that is allowing the heater core to heat up.

-alex

I don't think I understand this thread really.... Why are you messing with all this stuff??

#BecauseHeaterCore

Because these cars have a "problem".

If you are driving around on a nice 70 deg F day and you turn your HVAC system to "Cold" and AC Off, the vents still blow ~85 deg F air out of the vents....

Makes sense now.

hmm... opening the windows sounds like a good alternative to me instead of going through all this crap...

@dssence .... I commend your efforts in solving your dilemma. I fully expect to see pics of you re-arranging all of your heater core pipes in order to get the outside cold air. Afterwards .... when it gets cold in Argentina (if it ever does) ... will we see a new thread from you concerned about the lack of hot air coming through the vent.

OP could start a new fashion trend in the mod world by putting all that plumbing outside the car. Lots of pop-rivets and a big-ass wing as well. ETA: I have found my solution works well. When it's hot out, and the HVAC system seems to be blowing warmer than ambient air I turn on the AC.

OT: Am I the only one who read the title as "What are these 2 hoes for?"

I can't be the only one... right?

If you never use the heater you could just loop the hose instead. Cap off the heater core when you do so (or remove it assuming it doesn't hold other components, which it probably has other components mounted to it.. so.. yeah).

Argentina isn't even hot (at least Buenos Aires) so I'm not even sure what your goal is? Florida is hotter and the AC works just fine. :shrug:

You know you *could* just press the recirculate button.