What are these 2 hoses for ?

[dssence]

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 ?

[Travisty75]

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.

[speedrye]

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.

[dssence]

Originally Posted by speedrye

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 ?

[SloS14]

Originally Posted by dssence

That's right. But why are they constantly so hot.

uhh....because heater core?

[Synack]

#BecauseHeaterCore

[dssence]

Originally Posted by Synack

#BecauseHeaterCore

hehh a new hashtag

[mav1178]

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

[speedrye]

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.

[dssence]

Originally Posted by mav1178

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

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 ?

[dssence]

Originally Posted by speedrye

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.

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?

[mav1178]

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

[mav1178]

Originally Posted by speedrye

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.

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

[dssence]

Originally Posted by mav1178

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 ?