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93 Air Cond/ Cruise problems

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Old Oct 13, 2010 | 09:48 PM
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Default 93 Air Cond/ Cruise problems
My 93 does not select vents properly.. blows either defrost (most settings) or defrost and floor (heater/bilevel). Also the cruise will not engage. Any ideas? Probaly vacuum lines, but I am having trouble locating them.
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Old Oct 14, 2010 | 10:05 AM
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Your first move should be to buy a Factory Service Manual. Lots of troubleshooting help in it. C4's (and all contemporary cars) have many complicated systems that can't be serviced unless you have an idea how they work. Your cruise problem could be as simple as the defeat switch on the brake or clutch pedal being out of adjustment.
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Old Oct 14, 2010 | 10:31 AM
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Look for the fitting under the pass side fuel rail cover with two lines coming off it. One line goes to the HVAC and the other goes to the cruise control.
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Old Oct 14, 2010 | 12:37 PM
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Originally Posted by aminnich
Look for the fitting under the pass side fuel rail cover with two lines coming off it. One line goes to the HVAC and the other goes to the cruise control.
It is a check valve and can be found in the "Help" section at most parts stores.
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Old Oct 15, 2010 | 10:13 PM
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thank you
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Old Oct 15, 2010 | 10:13 PM
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Just picked up a service manual
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Old Oct 16, 2010 | 10:56 AM
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In the Red Help section at Autozone Help/GM 1983-2008 Two-Way Vacuum Check ValvePart Number:
47150




Features & Benefits

Replace when worn or damaged
Part Number: 47150
Weight: 0.02 lbs
Description: Two-way check valve
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Old Oct 16, 2010 | 12:53 PM
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Old Oct 16, 2010 | 05:12 PM
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Picked up the 2 way valve from Autozone, mine crumbled to pieces when removing, but nothing changed...cruise still inop and thre hvac blows out of defrost only.
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Old Oct 16, 2010 | 08:15 PM
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Section 1B1 of your fsm has info on diagnosing the hvac.
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Old Oct 16, 2010 | 10:16 PM
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Originally Posted by Pirate102
Picked up the 2 way valve from Autozone, mine crumbled to pieces when removing, but nothing changed...cruise still inop and thre hvac blows out of defrost only.
Any debris in the lines? I would check vacuum at the cruise servo next since it is so very easy to do.
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Old Oct 17, 2010 | 12:19 PM
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Originally Posted by aminnich
Any debris in the lines? I would check vacuum at the cruise servo next since it is so very easy to do.
Check the hose going into the intake with your finger to ensure you have vacuum to the valve. You might have pugged it up.
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