Question about 1999 Chevrolet Silverado 1500
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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Posted on Jan 02, 2017
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
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.
Posted on Dec 30, 2008
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."
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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