Which connection is input hot water and which is output cold water from inside car console heater?

Tiny
PAWEL_N
  • MEMBER
  • 2013 CHRYSLER TOWN AND COUNTRY
  • 3.6L
  • V6
  • 2WD
  • AUTOMATIC
  • 100,000 MILES
Hello friends,
Could you please tell me which pipe is supply with hot water and which pipe is return cold water from heater inside console? I marked red and blue circuit up and down. I am asking because I have additional parking heater Webasto installed and I am not sure if it is correct connected to water installation.
Have a nice day,
Pawel
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Thursday, January 7th, 2021 AT 6:48 AM

7 Replies

Tiny
KASEKENNY1
  • EXPERT
The top hose is normally always the inlet. Two reasons this is the case. First the hot coolant will flow down through the heater core and return out the bottom. They use gravity as a assist rather then trying to pump it up hill. Second you can see the hose on the top is wrapped. This is insulation that they place on it to keep the coolant as hot as possible as it goes into the heater core. Once the coolant comes out, it no longer needs to be insulated.

Let us know if you have other questions. Thanks
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Friday, January 8th, 2021 AT 7:40 AM
Tiny
PAWEL_N
  • MEMBER
Dear friend,

Thank you for your reply. I asked because I observed that my additional external parking Heater Webasto was connected to bottom pipe. But this heater should be connected to hot - input pipe, not return. This service is special for A/C and Webasto systems. I think I will never go there again.
Thank you for your help.
Have a nice day,
Pawel
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Friday, January 8th, 2021 AT 10:08 AM
Tiny
KASEKENNY1
  • EXPERT
You are welcome. That is good to know however, sometimes those things don't really matter if you are hooking to only one of the heater core lines. The reason is, both lines are about the same temp so they normally just pick the easiest to get to.

Let us know what other questions you have. Thanks
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Friday, January 8th, 2021 AT 5:03 PM
Tiny
PAWEL_N
  • MEMBER
Thank you for your reply. It is not so exactly, because the Webasto is series connected. It is equipped own water pump and the hot water goes first to engine and then return to internal console blower and back to Webasto. The water cycle must be the same way as engine water way. If service was wrong twice and connected wrong, the opposite water direction I have problem when the engine and Webasto are running the same time.
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Saturday, January 9th, 2021 AT 12:43 AM
Tiny
KASEKENNY1
  • EXPERT
Oh. I am sorry. I am not familiar with that model then. The ones I have seen they just need to know the direction of the fluid and route that as the inlet to the pump and the outlet from the pump goes back into the system. I put a drawing of what I have seen. Thanks for the info about this one. Thanks
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Saturday, January 9th, 2021 AT 4:37 PM
Tiny
PAWEL_N
  • MEMBER
Something is wrong - I check again and it looks like there is output hot water behind the engine, and return in front of engine. Behind the engine the pipe is more hot then the pipe which goes left side of engine and it goes further in front engine, to output from front heater. It looks like the top pipe is return hot (I marked blue color) and bottom pipe is input hot water from engine (I marked red color). What do you think about it?
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Tuesday, January 12th, 2021 AT 6:54 AM
Tiny
KASEKENNY1
  • EXPERT
I am not sure I am following just because I am not looking at it when you are describing it. I attached a coolant flow diagram below that should help.

Worst case scenario what I would do is take both lines off and put connect a line to them so you can route them to a bucket. Start the vehicle for a couple seconds and the one with coolant coming out is the inlet and no coolant is the return.
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Tuesday, January 12th, 2021 AT 6:13 PM

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