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3571Re: [bmw e28] Need assistance with Overheating

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  • scott Newe
    May 3, 2005
      Hey Chris

      Right now it�s just the gauge is saying it�s over
      heating. It�s always in the red. I am not losing any
      Coolant. I installed a new sensor and that didn�t fix
      the problem. So I installed an aftermarket sensor and
      gauge and removed my thermostat and if I let the car
      idel for 5 minutes it says it puts the gauge in the
      red. I have opened the bleeder screw for 5 minutes
      and let the car run while putting more coolant in and
      all that comes out of there is liquid.

      When I did the spark plugs for my tune up they were in
      normal condition.

      I have a brand new cap on my coolant tank from bmw
      because that was the first thing I notice. When I
      squeeze the radiator hose when the car is cool to hot
      I can see the fluid spill back into the coolant tank.
      I know when the gauge says it is over heating you can
      grab the radiator hose and its hot but not know 120
      degree C.

      I was going to change the switches on my radiator for
      my aux fan but I am having a hard time finding the 2 I
      need. All the parts stores around here say I only
      have one. So I have to call the dealer up and see
      what they might be able to do for me.

      I am also going to try and flush the engine and
      radiator to make sure there is no build up. However I
      did that last year when I had the water pump changed.

      Its really strange.


      --- chris insalaco <herrsinalco@...> wrote:
      > Scott,
      > You say your car is overheating but
      > what are the symptoms? Is it just hot on the gauge
      > or is the coolant disappearing? On the coolant tank
      > make sure the screw on cap has its seal and the
      > pressure valve in it is working. If you get some
      > 5/16" or 8mm fuel line, two 5/16" by 1/4"npt hose
      > barbs, 1/4"npt T-fitting and a Schrader tire valve
      > with 1/4" npt to fit in line betwen the radiator and
      > the coolant tank. This way you can pressurize the
      > cooling system and check the coolant cap valve and
      > leak down of system pressure in general. A tire pump
      > and pencil pressure gauge work for this but you can
      > go deluxe and get a four way fitting instead of the
      > "T" and add a 30psi clock gauge.
      > EVEN EASIER. Pull your spark
      > plugs and check for that pretty, clean one (or two)
      > that have been steam cleaned by coolant. Some cars
      > with poor cooling system maintinence get rust scale
      > and corrosion stuck in the passages between the head
      > and the deck. New radiator could have rust scale
      > from old engine.CHECK your fan belt.
      > Squeeze the radiator upper hose with car
      > running and not. The difference should be obvious,
      > use a rag if hot.
      > Open bleed screw on thermostat housing.
      > Especially before hose squeeze test. If coolant only
      > comes out, rejoice. If air, steam and foam come out
      > try topping off the system and bleeding it again. I
      > did this for nine months on my bavaria and there was
      > more coolant (H2O) missing until one night it
      > expelled its liquid in three miles. The temp gauge
      > would flicker but that time it went full hot. Nine
      > miles, three fill ups. Good luck!
      > Chris 277k 83' 528e
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