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Cadillac Catera and Cimarron Forum Discussion, Catera coolant leak in Past Cadillac Vehicle Discussion; ^^^ sounds like the heater control valve...
  1. #46
    todd2fst4u's Avatar
    todd2fst4u is offline Cadillac Owners Fanatic
    Automobile(s): 1998 Catera
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    Re: Catera coolant leak

    ^^^ sounds like the heater control valve

  2. #47
    BLK98LAC's Avatar
    BLK98LAC is offline Cadillac Owners Member
    Automobile(s): 98 catera
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    Re: Catera coolant leak

    looks like my next 3 days off will be working on the cat.

  3. #48
    ewill3rd is offline Cadillac Technician
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    Re: Catera coolant leak

    The heater control valve is much easier to replace.
    You can remove the two halves of the cowl and get sufficent room to access it without having to disassemble the engine at all.
    The oil cooler takes removal of all 3 pieces of the intake.
    It could be either, but it is hard to tell unless you get in there and look really well.

  4. #49
    BLK98LAC's Avatar
    BLK98LAC is offline Cadillac Owners Member
    Automobile(s): 98 catera
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    Re: Catera coolant leak

    ok, where did ya'll get you HCVs? dealership wants about $90 for one.

  5. #50
    BLK98LAC's Avatar
    BLK98LAC is offline Cadillac Owners Member
    Automobile(s): 98 catera
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    Re: Catera coolant leak

    ok, i got the cowl off and access door.
    what does the HCV look like and where would it be located when looking in the door?

  6. #51
    ewill3rd is offline Cadillac Technician
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    Re: Catera coolant leak

    The HCV is on the rear of the engine, passenger's side.
    It has a bunch of heater hoses going into it, you can't miss it.

  7. #52
    BLK98LAC's Avatar
    BLK98LAC is offline Cadillac Owners Member
    Automobile(s): 98 catera
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    Re: Catera coolant leak

    i think i found it.

    black, has 2 hoses going in one side, one out the other and a vacuum line off the top.

    as soon as i grabbed it i felt coolant all over the bottom of it, so im hoping its the problem.

    going to the dealer today to get a new one.

  8. #53
    ewill3rd is offline Cadillac Technician
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    Re: Catera coolant leak

    Sounds like you are on top of it!
    The hose clamps can be a pain.
    Good luck.

  9. #54
    BLK98LAC's Avatar
    BLK98LAC is offline Cadillac Owners Member
    Automobile(s): 98 catera
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    Re: Catera coolant leak

    the hose clamps were the screw type, so it was easy.
    ordered the part this morning and also got me a crapload of tools from sears.
    lol

  10. #55
    mytmous is offline Cadillac Owners Member
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    Re: Catera coolant leak

    anyone know where I can get a cheap ext. oil cooler for mine?

    01 catera, been down going on 3 weeks, I've broke 3 of the oil banjo bolts
    trying to keep it from leaking, I did repair the coolant leak(oil cooler plate)
    I've hacked the lines, just need a cheap oil cooler.

    The one's around here are $60 up to like $200+


    thanks.

  11. #56
    Jair28 is offline Cadillac Owners Member
    Automobile(s): 2000 Catera
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    Re: Catera coolant leak

    My 2000 Cat is leaking from this area, but when I tore it down to reseal the coolant plate I found a different problem. My leak is at the coolant banjo bolts that feed the heat exchanger. The rubber/metal washer/gaskets on the banjo bolts were blown. I couldn't find any similar ones that would fit so I used copper washers. Still leaking. Does anyone know where I can find these seals?

    Thanks for all the help everyone here has been! I'm pretty good mechanically, but without diagnostic help from this site I would have parted with my Cat long ago.

  12. #57
    Jair28 is offline Cadillac Owners Member
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    Re: Catera coolant leak

    Nevermind, found the part # 12992647. Dealership wants $7.04 ea. GMPARTSDIRECT.com $4.17 ea.

  13. #58
    R-Caddy's Avatar
    R-Caddy is offline Cadillac Owners Enthusiast
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    Re: Catera coolant leak

    I had my heater control valve changed about 2 years ago. The the car started leaking cooland slowly sometime last year again. One shop told me it was the head gaskets- probably both. I doubted. The strange thing is that it only leaks when the thermostat seems to open. I was told by a friend of mine that if it was the head gaskets the problem would have progressed, but it hasn't. I know I will need valve cover gaskets soon. Can it be the heater control valve again?

  14. #59
    CateraKidd's Avatar
    CateraKidd is offline Cadillac Owners Member
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    Re: Catera coolant leak

    what r the torque specs for the coolant bridge bolts ?

  15. #60
    mytmous is offline Cadillac Owners Member
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    Re: Catera coolant leak

    I have bypassed the bypass, i was tired of replacing that part.

    3 in 2 years at $90 each sucked.

    here is what i did.

    I used a 3/4 to 3/4 hose connector to connect the hose from the coolant bridge( the single hose on right) to the heater core feed line (the lower hose on left, also the one the runs up front under the coolant reservoir) then I used a 3/4 hose to 1/2 npt connector in the top hose on left.

    I used teflon tape and a 1/2 flare cap to seal that one tight.

    Took about 30mins I've ran it for awhile and not one leak so far, and i have heat when i want it.

    Cost me $9 for the parts.

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