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<p>[QUOTE=&quot;nasriza, post: 12359548, member: 106797&quot;]Psi is relative to temp ac off not running full charge roughly ambient temp for example at 70f should be around 72psi when ac running should be high side up to 300 psi and can comes on to bring down psi low side between 20 to 40 psi low side u can look up psi chart on Google for r134a. U can test freeze switch but it’s a pain cuz u need to put in ice and measure resistance or u can replace it I think it’s around $50. Or so sold separate behind blower.[/QUOTE]</p><p><br /></p>

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