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#1
08-14-2006, 10:11 AM
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A/C works great at idle and steady speed only
A/C was working fine until yesterday. Got in car and drove to church, no problem. When I came out to go home A/C would blow warm air out of vents unless I let off gas, was idling or was driving a steady speed on the highway. I do know that these are all high engine vacuum conditions and therefore this may indicate a vacuum leak. My question is: do the symptoms I'm describing indicate a vacuum leak and if so where should I be looking? I've checked under the hood and don't see anything obvious. I also don't hear a vacuum leak but then again I don't have the best hearing. Thanks.
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#2
08-14-2006, 10:21 AM
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Re: A/C works great at idle and steady speed only
What year and model Grand Prix? Do you have manual HVAC or digital climate control?
Normally with lack of sufficient engine vacuum the airflow through the vents will be improper. May only blow out of defrost and floor vents. You can test engine vacuum right on the accessory vacuum line off the intake manifold or supercharger.
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'08 Pontiac Grand Prix GXP (Dark Slate Metallic) - LS4 5.3L V8 '02 Oldsmobile Alero GL2 - LA1 3400 V6 '99 Buick Regal LS - L36 Series II 3800 V6 '03 Honda CR250R MX - 2 Stroke 250cc '97 Pontiac Grand Prix GTP - L67 Series II 3800 V6 Supercharged (Sold) Timeslip 08/12/06 AF Community Guidelines
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#3
08-14-2006, 10:35 AM
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Re: A/C works great at idle and steady speed only
Sorry, stupid me. I have a 1998 GTP with the climate control option. I will go out and check the vacuum ( if I can locate my vacuum gauge ) and post it here later. Thanks.
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#4
08-14-2006, 10:41 AM
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Re: A/C works great at idle and steady speed only
Quote:
__________________
'08 Pontiac Grand Prix GXP (Dark Slate Metallic) - LS4 5.3L V8 '02 Oldsmobile Alero GL2 - LA1 3400 V6 '99 Buick Regal LS - L36 Series II 3800 V6 '03 Honda CR250R MX - 2 Stroke 250cc '97 Pontiac Grand Prix GTP - L67 Series II 3800 V6 Supercharged (Sold) Timeslip 08/12/06 AF Community Guidelines
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#5
08-14-2006, 11:52 AM
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Re: A/C works great at idle and steady speed only
I've hooked up a pressure / vacuum gauge and am getting about 15" vacuum at idle. I was looking at the vacuum "manifold" on top of the supercharger near the throttle body and was wondering, is that a check valve that all the vacuum lines attach to? I'm hooked up upstream of that point right now. I will have to check the vacuum there later, gotta go do some things now for a couple of hours.
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