cooling system circ direction

Discussion in 'Workshop Forum' started by JDExSquid, Oct 27, 2019.

  1. JDExSquid

    JDExSquid Not quite a Daily Driver!

    Location:
    Stockbridge, GA
    I'm getting ready to splice the Fiat cooling system w/ the Chrysler 2.2 TII, using a Davies Craig electric pump. The Fiat cooling system seems to be VERY busy, especially at the thermostat housing. If I could figure out flow direction thru each of the components it may make my job easier. I've searched but as yet have not found flow info. Thanks!
     
  2. JimD

    JimD Waiting for Godot... Moderator

    Location:
    Missouri, USA
    This is from the shop manual. Maybe it will help?
    thermostat housing flow.jpg
     
  3. JDExSquid

    JDExSquid Not quite a Daily Driver!

    Location:
    Stockbridge, GA
    Ok, that certainly helps! A couple of questions: Does the water pump pull coolant from the thermostat housing lower side and push coolant thru the engine, returning to the thermostat housing upper side and on to the upper radiator hose? Also, with this flow direction, the rubber heater hose inside the cabin would be supply and the hard line running parallel with the coolant tubes would be return, right?
     
  4. JimD

    JimD Waiting for Godot... Moderator

    Location:
    Missouri, USA
    I am not sure what you mean by "the thermostat housing lower side". "The diagram's legend says "2. Union for water pump inlet pipe." So that tells me that the water pump pulls from "2." and pushes into the block thru the large opening in the block where the pump mounts. Where "2." gets its coolant varies as the thermostat goes from closed to kinda open, to fully open.

    Yep, the hard line in the center tunnel is the return from the heater circuit.
    heater_hose2.JPG
     
  5. JDExSquid

    JDExSquid Not quite a Daily Driver!

    Location:
    Stockbridge, GA
    Thanks Jim! That makes good sense. Now I have to figure out the 2.2 TII flow and combine the two. The electric water pump acts as the thermostat.
     
  6. JimD

    JimD Waiting for Godot... Moderator

    Location:
    Missouri, USA
    Good luck!
     
  7. rachaeljf

    rachaeljf True Classic

    Location:
    Northampton UK
    If you don't plumb in the electric pump in the same place as the stock pump you will need to relocate the heater return pipe to the suction side of the new pump.
     
    kmead likes this.
  8. JDExSquid

    JDExSquid Not quite a Daily Driver!

    Location:
    Stockbridge, GA
    According to pictures, it looks like the coolant is being pushed thru the left pipe into the lower left of the radiator, thru the rad, then out the upper right and returning to the engine bay thru the right side pipe. Is this to push air up toward the bleed port? The setup is opposite on the Dodge, but the rad and engine were in the front on that car.
     
    Last edited: Nov 2, 2019
  9. JimD

    JimD Waiting for Godot... Moderator

    Location:
    Missouri, USA
    Hi Jim,

    The picture shows port 4 going to the rad. Port 4 is the top port on the housing and feeds water to the right (US pass side) pipe which feeds the top port on the right of the rad. Port 3 is the lower port on the housing and receives the water back from the rad from the bottom port on the left (US driver side) of the rad. You want to be drawing from the lowest point of the rad to enhance the probability that you are drawing coolant, not air, back to the engine.
     
  10. JDExSquid

    JDExSquid Not quite a Daily Driver!

    Location:
    Stockbridge, GA
    Then I may have inadvertently found a problem with my stock x. The hoses appear to be crossed.
     

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