How to determine bad heat exchanger

Discussion in 'The Hardware' started by carpetman727, Mar 15, 2018.

  1. carpetman727
    carpetman727

    Member

    Joined:
    Sep 1, 2012
    Messages:
    3
    Name:
    tony
    I have Hydramaster CDS, one of the heat exchangers is bad due to water backing into the coolant reservoir. Is there a way to determine which heat exchanger is the bad one? Thanks in advance for any input.
  2. Lee Stockwell
    Lee Stockwell

    FOJL

    Joined:
    Oct 7, 2006
    Messages:
    14,121
    Location:
    Benton KY USA
    Name:
    Lee Stockwell
    Bypass one of them.
    ronbeatty and dealtimeman like this.
  3. Lee Stockwell
    Lee Stockwell

    FOJL

    Joined:
    Oct 7, 2006
    Messages:
    14,121
    Location:
    Benton KY USA
    Name:
    Lee Stockwell
    There is a leak or split tube in the high pressure side pushing cleaning water into the low pressure cavity.
    dealtimeman likes this.
  4. dealtimeman
    dealtimeman

    Everyday is Saturday.

    Joined:
    Sep 20, 2008
    Messages:
    10,321
    Location:
    Fort Worth , Texas
    Name:
    Michael
    Some are repairable just depends where the crack is.
  5. Nomad74
    Nomad74

    Supportive Member

    Joined:
    Feb 4, 2016
    Messages:
    4,242
    Location:
    Redding
    Name:
    Damon
    Jimmy L likes this.
  6. Lee Stockwell
    Lee Stockwell

    FOJL

    Joined:
    Oct 7, 2006
    Messages:
    14,121
    Location:
    Benton KY USA
    Name:
    Lee Stockwell
    I have one, probably wouldn't help.
  7. Doug Rice
    Doug Rice

    Supportive Member

    Joined:
    Feb 28, 2011
    Messages:
    260
    I don't think a cold spot will show up as one is probably cooler all the time as it is downstream. I agree with the bypass idea. It might take a bit of simple plumbing to do the changeover but it is a good way as the HX most likely will leak more when heated. You will have to run for a while to figure it out but be patient. I have a local dealer that sends them out to a radiator shop to check them for leaks. Where are you located at?
  8. Lee Stockwell
    Lee Stockwell

    FOJL

    Joined:
    Oct 7, 2006
    Messages:
    14,121
    Location:
    Benton KY USA
    Name:
    Lee Stockwell
    On my WM, which is a typical set up, a van coolant hose goes into the first hx, then a jumper hose goes from the exit of that hx to the inlet of the second hx. The outlet hose from the 2nd hx goes back to the engine, usually via a Tee in the lower radiator hose.

    Usually one of the hx hoses is long enough to do the bypass without much trouble.

    A screwdriver or hose clamp nut driver is all that is needed. (sorry Marty)

    Further diagnostics:

    If water NOW comes out of the bypassed hx open hose barb you have the bad one. Go ahead and bypass the high pressure hoses to that hx and then remove the hx for repairs.

    If high pressure water continues to overfill the van's coolant and overflow the radiator.....you guessed wrong and bypassed the GOOD hx. Go back and pull the other one.

    You will still get pretty good heat with one hx, but go ahead and get the other one fixed. Respect Murphy.
    Desk Jockey and Doug Rice like this.
  9. Jimmy L
    Jimmy L

    Member

    Joined:
    Oct 7, 2006
    Messages:
    10,673
    Location:
    Ne
    Name:
    Jimmy L
    Maybe pull both and get fixed updated before the other one goes.
  10. Desk Jockey
    Desk Jockey

    Rico Suave

    Joined:
    Oct 9, 2006
    Messages:
    55,828
    Location:
    a planet far far away
    Name:
    Mr Misunderstood
    When it happen to my Butlers I had to replace the heat exchanger each time. They could have cut the box open to find the hole or holes but didn't put much stock in finding it with cutting it to ribbons.

    Sorry, its a major hit, hopefully you have had it many years and made good money off it. Ours had been in the field quite some time before failure.
  11. Brian H
    Brian H

    Member

    Joined:
    Dec 14, 2006
    Messages:
    1,711
    Location:
    Detroit Michigan area
    Name:
    Brian H
    Over the years, we have cut a few Butler heat exchangers open, repaired the leak and then re welded them.
    Desk Jockey and Lee Stockwell like this.

Share This Page