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I have a '99 Suburban 4x4 with 454 engine. What I think you are looking at is an electrically actuated switch with a vacuum source that when actuated by the A/C system allows the vacuum to operate a servo in the heater hose to the front heater core(probably rear as well), bypassing the heater core for more efficient A/C operation. Hope this helps! Mike

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โˆ™ 2007-01-09 07:56:19
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Q: What is the solenoid looking thing mounted on the firewall on the passenger side behind the ac reciver drier on a 1996 GMC Suburban 4x4 454?
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