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74 Headlight Switch hissssss!

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Old Aug 20, 2001 | 12:09 AM
  #1  
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Hava89
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From: Lake Havasu City Arizona
Default 74 Headlight Switch hissssss!

My son's 74 Coupe has developed a hissing sound at the headlight switch on the dash. Typically, what's involved here? Does the switch need to be replaced or could there be vacumm hoses loose? Do you have to take the dash apart to to work on it?

Any assistance is appreciated.

Mike
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Old Aug 20, 2001 | 12:55 AM
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Default Re: 74 Headlight Switch hissssss! (Hava89)

The ends of the vacuum hoses sometimes split/perish and can be tricky to locate....also check the vacuum hoses on the override switch,same thing happens there.......john :chevy
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Old Aug 20, 2001 | 08:39 AM
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Default Re: 74 Headlight Switch hissssss! (Hava89)

I had the same hissing sound on mine and the headlight doors did not work. Turned out to be the headlight switch which was new. Replaced the switch and solved the problem. You should be able to change the switch by removing the upper dash pad. :chevy
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Old Aug 22, 2001 | 12:02 AM
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Default Re: 74 Headlight Switch hissssss! (Ken74Conv)

jdunne & Ken74Conv ~

Thanks for the info! Looks like I'll start digging into dash. Hope that's all that's required Ken to get to the switch. We'll see how it turns out.

Thanks

Mike :seeya
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Old Aug 22, 2001 | 04:08 AM
  #5  
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Default Re: 74 Headlight Switch hissssss! (Hava89)

If you are replacing the switch,spend the extra and replace the dip switch at the same time....it isn't very expensive.......the main switch is lots of fun changing......expect it to take a while........john :chevy
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Old Aug 22, 2001 | 10:00 AM
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Default Re: 74 Headlight Switch hissssss! (Hava89)

The hiss is a sure sign of a vacuum leak at the switch. Could be either of the two vacuum lines which attach to the switch, or the switch itself.
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