Question about 1999 Chevrolet Silverado 1500

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1999 Chevrolet Silverado 5.3l a/c is cold while sitting still idling but once you start driving is not as cold can't figure out what's wrong?

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  • Denis Houle
    Denis Houle Jun 28, 2018

    The a/c temperature door is activate by vacuum and when you are idling the vacuum is at max. When you start driving the vacuum is lower so this is why the a/c temp/door release just enough to let the hot air goes into the mix air
    you can have a sticky temperature door
    If you want to try something look under dash and find the temp door linkage or vacuum hose and with a vacuum pump active the actuator and look if it hold the vacuum meter.

    hope it helps.

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  • Chevrolet Master
  • 1,129 Answers

Just for fun,clamp off the heater hoses,just squeeze them flat in place to stop the hot coolant flow through the heater core.Take it for a spin and see if the a/c stays cold.Sometimes with increased hot coolant flow through the heater core with increased engine rpm (driving) and a leaky air flow door in the a/c heater assembly,it can be hard to keep the a/c air cold.

Posted on Jun 04, 2018

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6 Suggested Answers

6ya6ya

6ya staff

  • 2 Answers

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Posted on Jan 02, 2017

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Lee

  • 141 Answers

SOURCE: Chevrolet Silverado 97 2500 Turck won't start

The GM's are notorious for losing fuel pressure,could be fuel pressure regulator,or a weak fuel pump....also check for rusted fuel lines that will lose pressure when sitting..both feed and return lines...

Posted on Dec 12, 2008

alpha4

Dale Ellenberg

  • 42 Answers

SOURCE: 1990 chevrolet 1500 pickup starts hard when cold

Most likely the coolant temperature sensor for the vehicle computer. Secondly, could be the tps sensor "throttle position sensor" not registering correctly or perhaps lots of other things but most likely the coolant temp sensor.
Dale

Posted on Dec 30, 2008

cadman000

Eric Heifetz

  • 607 Answers

SOURCE: 1999 Chevrolet Silverado 1500 not getting over

Check catalytic converter for clog. Does exhaust sound like a vacuum cleaner whoosh when this is occuring ?

Posted on Apr 27, 2009

John P Schwantes Jr

  • 1509 Answers

SOURCE: rough idle then stalls

Vacume leak or bad idle motor. With the car in park and running with the hood open listen for leaks moving your hand around the different hoses looking for a change in the sounds that you hear. The idel motor also makes the car idel up to 1500 RPM or so right at start-up then idel down, If it doesn;t the idel motor is likly. Check engine light is on when running? Test for codes, Follow code test charts don't skip any steps!.

Posted on Nov 02, 2009

Testimonial: "Found the problem vacume leak like you said."

drsinister69

James Milzheimer

  • 2317 Answers

SOURCE: why does my 1989 chevrolet s10 surge and idle up

You may have a bad idle air control valve, I would also check for a vacuum leak, from a vacuum hose or a broken vacuum tee.

Posted on Jul 14, 2010

Testimonial: "thanks for the advise i will check the iddle control valve "

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Have you checked the fuel pressure regulator to see if its leaking?

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

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