How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Tim's Auto Repair Your Own Question
Tim's Auto Repair
Tim's Auto Repair, mechanic
Category: Chevy
Satisfied Customers: 16029
Experience:  Have owned a repair shop for 25 yrs.
Type Your Chevy Question Here...
Tim's Auto Repair is online now
A new question is answered every 9 seconds

Chevrolet G20 Sportvan: have a 1995 G20 conversion van: need

Resolved Question:

have a 1995 G20 conversion van: need a vacuum diagram for the heating/ AC controls. I loose air flow from the front registars
at high speeds. thought maybe intake manafold leak, but I jump out the blue and brown vac line on the control assembly and tthe front air flow stays at the same air flow at idle. ?
Submitted: 5 years ago.
Category: Chevy
Expert:  Tim's Auto Repair replied 5 years ago.
this should work for you

Customer: replied 5 years ago.

my air flow in max a/c setting, front registars have plenty air flow at a idle and at lower speeds, when I get to a cruiseing speed minimum air flow.
when I jump out the brown and blue vac lines the air flow is good at all speeds?

Expert:  Tim's Auto Repair replied 5 years ago.
this sounds as if your vacuum switch itself may be bad,[maybe has a small vacyuum leak],,,sense it does work when you connect the vacuum sourse to the to the blue line
Customer: replied 5 years ago.

how important is the function of #2 tank, heater and AC control vacuum.

I tested the tank wont hold vacuum, or pressure.

Expert:  Tim's Auto Repair replied 5 years ago.
this is the bi-level,,this operates the vents and the loor vent at the same time,,not real important i wouldnt think
Customer: replied 5 years ago.
Is the part , the vacuum switchi, still available? At a
Gm dealer?
Expert:  Tim's Auto Repair replied 5 years ago.
i do have a part#,,so,i would think the dealer may still be able to get it.....if not,,you may need to get a used one from your local salvage yard or from
995 Chevy Truck G 20 Van V8-350 5.7L VIN K TBI
Control Assembly Parts and Labor
Parts Information OEM Part # Price
Control Assembly
Main Dash Unit Control
Without AC
16034630 $69.38
With AC
16126335 $158.48
Contact Dealer for most current part and price information
Labor Information Skill Level Mfg. Warranty Standard
Replace Dash Control Unit
Main Unit
B 0.5 0.8

Customer: replied 5 years ago.

not looking for complete control assembly, just the vacuum switch?

Expert:  Tim's Auto Repair replied 5 years ago.
this is the only way i can find it at the dealer
perhaps you will need to try or,your local salvage yard
Tim's Auto Repair and 6 other Chevy Specialists are ready to help you