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What would cause a heater to not blow hot?

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    #1

    What would cause a heater to not blow hot?

    The car is a 90 325i - the heater blows warm when stopped and cold as can be when the car is moving. I'm assuming the heater valve is stuck closed? I can hear a flap close or something when i turn the heat knob - so im assuming that's not it. Any ideas?
    "We praise or find fault, depending on which of the two provides more opportunity for our powers of judgement to shine."
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    #2
    I'd start with a t-stat. Sounds like it's stuck open.

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      #3
      Originally posted by jbsjunk View Post
      I'd start with a t-stat. Sounds like it's stuck open.

      I guess that would explain the car running under the half way mark all the time. I'll swap it out.
      "We praise or find fault, depending on which of the two provides more opportunity for our powers of judgement to shine."

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        #4
        did you mess with the hoses going to the heater core? After my swap, I flipped the hoses to the core and didn't get nearly as much heat as I wanted.
        San Diego BMW repair -> Jake @ www.littlecarshop.com Great guy :up:

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          #5
          I would guess the t-stat as well. I had to drive without mine for a while as to not overheat.

          Every day I wake up we drink a lot of coffee and watch the CNN
          Every day I wake up to a bowl of clover honey and let the locusts fly in.
          Lobsterbacks attack the town again
          Wrap all my things in aluminum
          Beams of darkness streak across the sky
          Pink rays from the ancient satellite
          Every time I look out my window same three dogs looking back at me.
          Every time I open my windows cranes fly in to terrorize me.

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            #6
            I would say t-stat is a good start. bet that fixes it
            Originally posted by Fusion
            If a car is the epitome of freedom, than an electric car is house arrest with your wife titty fucking your next door neighbor.
            The American Republic will endure until the day Congress discovers that it can bribe the public with the public's money. -Alexis de Tocqueville


            The Desire to Save Humanity is Always a False Front for the Urge to Rule it- H. L. Mencken

            Necessity is the plea for every infringement of human freedom. It is the argument of tyrants.
            William Pitt-

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              #7
              a clogged core would also do that

              Comment

                #8
                Originally posted by Mr Deagle View Post
                a clogged core would also do that
                true, but lets start with the easy stuff 1st, and he said his car was running cool
                Originally posted by Fusion
                If a car is the epitome of freedom, than an electric car is house arrest with your wife titty fucking your next door neighbor.
                The American Republic will endure until the day Congress discovers that it can bribe the public with the public's money. -Alexis de Tocqueville


                The Desire to Save Humanity is Always a False Front for the Urge to Rule it- H. L. Mencken

                Necessity is the plea for every infringement of human freedom. It is the argument of tyrants.
                William Pitt-

                Comment

                  #9
                  what about the recall thing that goes inline between the engine block and the heater core? that is supposed to close so the heater core does not blow up if the car overheats

                  Comment

                    #10
                    Just before the heater core is a small valve. Ball style, it does a great job closing water flow to the heater core. It is electrically controllled, and closes when the A/C is on.

                    It is intended to make the coolant circulate only through the block when the A/C is on, which explains the odd block bypass circulation hoses under the throttle body.

                    Mine stuck shut, making no heat. I was too broke to replace it, so I drilled it out. Bad idea, BTW. Cheap but shitty!

                    Your car may be suffering from the same thing.

                    GL, HTH,
                    Luke

                    Closing SOON!
                    "LAST CHANCE FOR G.A.S." DEAL IS ON NOW

                    Luke AT germanaudiospecialties DOT com or text 425-761-6450, or for quickest answers, call me at the shop 360-669-0398

                    Thanks for 10 years of fun!

                    Comment

                      #11
                      I 2nd dayed a t stat from bavauto. I'll see if that helps.
                      "We praise or find fault, depending on which of the two provides more opportunity for our powers of judgement to shine."

                      Comment

                        #12
                        Originally posted by StereoInstaller1 View Post
                        Just before the heater core is a small valve. Ball style, it does a great job closing water flow to the heater core. It is electrically controllled, and closes when the A/C is on.

                        It is intended to make the coolant circulate only through the block when the A/C is on, which explains the odd block bypass circulation hoses under the throttle body.

                        Mine stuck shut, making no heat. I was too broke to replace it, so I drilled it out. Bad idea, BTW. Cheap but shitty!

                        Your car may be suffering from the same thing.

                        GL, HTH,
                        Luke
                        +1


                        91 318is

                        Comment

                          #13
                          Originally posted by StereoInstaller1 View Post
                          Just before the heater core is a small valve. Ball style, it does a great job closing water flow to the heater core. It is electrically controllled, and closes when the A/C is on.

                          It is intended to make the coolant circulate only through the block when the A/C is on, which explains the odd block bypass circulation hoses under the throttle body.

                          Mine stuck shut, making no heat. I was too broke to replace it, so I drilled it out. Bad idea, BTW. Cheap but shitty!

                          Your car may be suffering from the same thing.

                          GL, HTH,
                          Luke

                          How hard is it to get to if the t stat doesnt help?
                          "We praise or find fault, depending on which of the two provides more opportunity for our powers of judgement to shine."

                          Comment

                            #14




                            Is it #7 on the 2nd pic or # 16 on the first pic?

                            Thanks guys
                            "We praise or find fault, depending on which of the two provides more opportunity for our powers of judgement to shine."

                            Comment

                              #15
                              I'm looking at this - those are 2 different heater assemblies. Which is most likely on my car? I guess i can worry about it when the tstat doesn't work.
                              "We praise or find fault, depending on which of the two provides more opportunity for our powers of judgement to shine."

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