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328 Heating System

Discussion in 'Technical Q&A' started by Futureman, Oct 21, 2007.

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  1. Futureman

    Futureman Formula 3

    May 16, 2007
    2,024
    #1 Futureman, Oct 21, 2007
    A while back I posted about a coolant leak at the front of the car when I turned the heaters on to bleed the system. So I've now discovered that one of the heater valves is leaking. Ricambi says it's NLA, but has a price of $240. Is this thing rebuildable? Also, when I turn the heating system on, the valves sound like they are both operating, but there is no heat (the hoses remain cold). This would appear to be a thermostat issue, but the car has never had an overheating problem. I just would spit out a little coolant after every drive, thus the air bleeding procedure that prompted this discovery. Anyone else gone through this?
     
  2. Futureman

    Futureman Formula 3

    May 16, 2007
    2,024
    #2 Futureman, Oct 27, 2007
    Anyone?
     
  3. Stew

    Stew Formula Junior

    Apr 16, 2006
    547
    Los Angeles
    #3 Stew, Oct 27, 2007
    Have you checked BOTH heater cores ? They leak.

    Regards,

    Stew
     
  4. Brian Harper

    Brian Harper F1 Rookie
    Owner Silver Subscribed

    Feb 17, 2006
    4,078
    San Jose area
    Full Name:
    Brian Harper
    #4 Brian Harper, Oct 27, 2007
    You are going to have to pull that valve anyway, so pull it and see if it operates. If it does then you have some blockage. On the 308 there is a hose that leaves the rear head at the left side and makes the looong journey to the front of the car. I assume the 328 is the same. Does this hose get hot at the engine? If not you could have a blockage. Try blowing through that hose and see what you get. Maybe it is pinched by the routing past the fuel tank or something. Also on the 308 the heater return hose meets up with the cold side of the radiator. This could be pinched and stop flow. Or the cores could be clogged with debris. I'd start disconnecting hoses and blowing through them and see what happens.
     

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