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broken heater defrost control 200

posted by  Michel on  Sat Oct 30 16:02 CST 2010
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last visit: Thu Dec 2 08:58 CST 2010
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My blower only functions on heater and floor mode (no defrost). I took the center console out and didn't see any obviously disconnected vacuum lines. Is the vacuum created by the blower itself? Is floor passage the default? I will take more of the front apart tomorrow. How can I check for bad vacuum? It could also be a stuck louver. What else could cause the problem? The did not come with AC.
--
Michel Garcia - 1986 240 B230F & 1982 240 B21A - Ottawa, Canada








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    broken heater defrost control 200

    posted by  Jorrell on  Sat Oct 30 16:13 CST 2010
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    last visit: Thu Dec 27 03:00 CST 2012
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    The vacuum to the heating system is provided by a hose from the intake of the engine. This hose routs through the firewall on the passenger side and runs to a vacuum storage tank under the center console.

    I suspect that either a hose has split/come off, or one of the vacuum actuated diaphragms has sprung a leak. The critical tool for finding the leak is a manual vacuum pump with a vacuum gauge on it, if you pull a vacuum and it leaks off, you are on the right track to finding the leak.

    jorrell
    --
    92 245 299.3K miles, IPD'd to the hilt, 06 XC70, 00 Eclipse custom Turbo setup...currently taking names and kicking reputations!








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      broken heater defrost control 200

      posted by  Michel on  Sat Oct 30 16:58 CST 2010
      Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
      last visit: Thu Dec 2 08:58 CST 2010
      [RELATED]

      Good to know that vacuum comes from the engine even though I can start the blower without the engine running. I found my manual vacuum pump. So, I'll try pulling a vacuum on the tube that connects to the defrost switch on the center console and see if the defroster gets air? Need to fix this ASAP, it's already snowing in Ottawa!
      --
      Michel Garcia - 1986 240 B230F & 1982 240 B21A - Ottawa, Canada







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