Question about 2004 Chevrolet Silverado 1500 Crew Cab

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I am having trouble diagnosing my heater/air conditioning controls. I don't have a diagram of all the vacuum hoses and where to start finding the lack of vacuum or how to check the various components.

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  • zipperworm Nov 17, 2008

    Control knob is stuck on "max a/c". Wont move to any other setting.

  • garylwhat Nov 25, 2008

    I can not move the heat from windshield to floor, I stays on the windshield. fan works fine, just cant move air flow

  • wallpaper356 Nov 27, 2008

    My ac & heat control would not change from the windshield to any other setting and my mechanic found that it was a vacuum hose connection that was broken. I now have the same problem 2 years later and am trying to fix it mysef. I believe that the vacuum hose is located in the engine compartment and you need to remove the engine cover inside the car. I am looking for a vacuum hose diagram for the heat and ac.

  • Anonymous Jan 10, 2009

    Heater motor is blowing but just a little bit of air is coming out of the floor,cant figure it out.I took the blower motor out and the blade was good. Maybe something is stopped up? please help me.Thanks

  • daseabees Apr 07, 2009

    air only comes through the defrost

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We are having the same problem the air works on the pass. side but hot air comes out the drivers side he thought it might be a fuse but don't work still

Posted on Apr 26, 2009

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I have no heat coming out of my heater on my 1967 Buick Riviera, 430-4. Had engine overhauled. The mechanic may not have hooked the vacuum lines Really want to find a vacuum line diagram for the 67.


If you lost a vacuum line then the heater would let hot air out the vents with or without the fan motor running. Do this test with the engine up to operating temperature Touch both hoses with the heater on and temp control to the hottest position. Now check the temperature of both hoses. They should be the same. If not that indicates a blockage of water to the heater core. Test the water flow valve too. It can be plugged with rust or not moving to let water into the core. The core itself can be plugged too. If you really need a hose diagram, a Chilton's manual will be your source of information. The engine won't idle well with a vacuum hose off.

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Can I get a diagram of how to remove the heater core


In order to remove most heater cores involves discharging the air conditioning system, draining the radiator fluid , disconnect blower motor, disconnect the air-conditioning lines, special tools are needed for most models. Remove PCM ( COMPUTER ) LABEL AND DISCONNECT electrical connectors, disconnect vacuum hoses. Hope this helps, but really should be done by qualified mechanic.

Dec 18, 2015 | Cars & Trucks

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I've replaced the water-pump,thermostat,heater-core and radiator,as well as the actuator. and still have no heat. it blows cold air. anyone have a solution?


No kidding. It's minus 26 right now in Montana where I am.
What actuator was that? The vacuum controlled doors are probably the problem. If both heater hoses are hot, coolant is circulating, and it must be a door in the heater case assembly not opening.
In this frigid weather, I would buy a hand vacuum pump and try all the little vacuum canisters around the case (under the dash) and see if you could find the door that gives heat out the vents, defroster, anywhere you can get some heat in the car. Get some heat, and diagnose fully when it warms up. A single vacuum line from the engine goes through the firewall into a podlike fixture, mounted probably below and to the right of the heater/ac control head. Probably electrically controlled, the pod delivers vacuum signals through several hoses to little canisters that operate the heater doors.

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1 Answer

2001 gmc safari temp gauge says theres is heat but it blows cold


There are several reasons why your car's heater may be blowing cold air, instead of heat. It is important to understand how the heater works in your car before you can begin to try to diagnose why it is not working. First, there is NOT an electric heater element in the heater system in automobiles, like in portable heaters used in the home. The part that transfers heat into the passenger compartment is called a heater core. A heater core can be thought of as a miniature radiator. The car engine's coolant flows through the heater core while the fan (also called a blower), blows air through the heater core fins. When air blows through the heater core fins, it is warmed, therefore warming the passenger compartment.
Start by checking the coolant. As we already said coolant is what warms the heater core. So if the coolant is low, there may not be a sufficient amount of warmth to transfer heat to the air in the passenger compartment. Since it 's cold outside, low coolant may not effect the operating temperature of the engine significantly, so you won't be alerted to a coolant problem by the temperature gage on the instrument panel. Once the coolant is full, feel the heater hoses that go through the firewall. With the engine at normal operating temperature, BOTH of the heater hoses should be hot to the touch. If only one is hot, this indicates there is is a blockage in the heater core or there is air trapped in the heater core. Using a Lisle coolant funnel is helpful in purging the air from the cooling system. If the coolant is really brown, has been neglected, or if "stop leak" has been used at some point, the heater core could be stopped up. The blockage can sometimes be unstopped by removing the heater hoses and using a garden hose with a sprayer to flush the heater core out. If neither of the hoses are hot to the touch, there could also be a malfunctioning heater control valve, if used on the model you're working on. Check for presence of a heater control valve by following the heater hoses back to the engine. Sometimes, a vacuum line could have a break causing there to be no vacuum to operate the valve. Also it should be noted that if this is your first winter with this car (and you're unfamiliar with the car's repair history), the previous owner could have by-passed the heater core because of a leak. When a heater core leaks, usually they wet the passenger side floorboard. The labor cost to change heater cores is usually expensive, so sometimes people will loop the heater hoses and by-pass a leaking heater core instead of repairing it properly.
Next check for proper airflow. After you're sure the heater core is getting hot water flow, read the following information. Doors within the heater case are either controlled by electric actuators, cables or vacuum motors. Adjust the heat control to both extremes while listening for movement of the blend door. With a cable operated heater door it's easiest to hear the door thump when it closes. If the door is not operating, find the door that controls the airflow across the heater core. If there is an electric motor that controls the door, tapping on it can sometimes make it work temporarily for testing purposes. A vacuum operated motor needs vacuum to work, so using a handheld vacuum pump for testing is usually recommended. If the vacuum motor does not hold vacuum, the diaphragm is leaking requiring replacement. To go deeper into diagnoses of the control head's function and diagnosis, specific vehicle repair manual information is needed. But hopefully the basics laid out in this article has helped to get you started on the right track.

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1 Answer

Cannot change temperature on heat & air


Temp is controlled by an electric motor(or could be vacuum hose) on the blender door of heater housing. If you find this is operating correctly, then the problem is a plugged heater core.Backflush it by removing both heater hoses and flushing from water pump side toward thermostat side.don-ohio

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2 Answers

Engine will star and idle but will not increase in power when gas peddle is pressed


The engine in your car is designed to run smoothly with maximum power output and produce as minimal emissions as possible. When your car's engine is not performing properly it can cause, low gas mileage, low power output, increased emissions and possible internal engine damage if left untreated. This troubleshooting guide is designed to isolate the malfunctioning cylinder and troubleshoot to repair the problem. Before we start we need to know one of two things; is the engine running poorly at idle only and seems to be ok under power? Or does the engine run fine and it's just the engine idle condition that is the problem. If your engine is idling rough please visit, engine misfires at idle If your engine cranks over but won't start visit engine wont start. If your engine won't crank over visit engine wont crank over. If your engine is running rough all of the time or intermittently you are in the right place. Below we have created a guide to aid diagnoses and repair procedure for most common rough engine running problems.
Car Repair Guide - READ COMPLETELY BEFORE BEGINNING
  • Step 1: Anytime you have a problem with electronically controlled components such as an engine, transmission, ABS brake, or SRS (supplemental restraint system, air bag) inspect all fuses in the under hood power distribution center and under dash fuse panels using a test light. If all fuses test ok continue to the next step.
  • Step 2: To check for problems with electronically controlled components such as an engine, transmission, ABS brake, or SRS (supplemental restraint system) and the fuses test ok a trouble code scan is needed to identify any system trouble. Use a simple scanner tool to retrieve trouble codes and check if they relate to the specific problem, like an ignition coil failure code. If a trouble code is present but does not pertain to the immediate problem like an EVAP code ignore it until a later time, after the engine is running properly. The reason we repair non-related codes after the engine is running properly is because sometime false codes can be triggered by a rough running engine. Once the engine is running properly the code present might cycle and turn itself off. You might say "if the engine isn't running right shouldn't it have a check engine light and a trouble code?" Sometimes conditions occur that will not be detected by the computer, example: if the intake or exhaust valve operation fails the computer cannot detect the failure because the problem is not sensor related, so the engine doesn't run smooth and the computer thinks everything is ok with no codes. If the trouble code retrieved relates to a cylinder misfire like an injector driver or ignition coil failure first repair these problems then re-test system. If no trouble codes are present proceed to the next step.
  • Step 3: The spark plugs in your engine are used to ignite the compressed fuel air mixture. If the condition of the spark plugs are fouled by excessive fuel or carbon the engine will not start, backfire or run rough. Remove all spark plugs to inspect the condition of the plug. Please use this spark plug condition reference guide to see how the spark plugs are operating.
  • Step 4: Check for broken or dilapidated vacuum hoses on and around the engine, your car's engine is designed to run on a system that can hold vacuum. Vacuum hoses are typically connected to the engine intake manifold and will supply engine vacuum to various accessories like power brakes. Some cars are designed with a larger vacuum transfer hose like Ford that connects the intake manifold to the IAC (idle air control) motor. A broken or dilapidated vacuum line or air intake boot can cause the engine to lose vacuum which will allow the engine to run rough and die. Inspect all engine and accessory vacuum lines to look for missing, torn or dilapidated lines and replace as needed. Also have a helper rest their foot on the gas pedal just enough to keep the engine running. Check the engine when it is running to listen for any whistling noise coming from the engine that is not usually present. Follow the noise and inspect vacuum lines in that area. Also, when the engine is running it will pull inward a broken or weak piece of the hose to create a larger vacuum leak. Check the integrity of all vacuum hoses at each end of the hose. Typically this is where a vacuum hose fails. If all vacuum hoses check "ok" proceed to the next step.
Also check here: http://www.2carpros.com/articles/engine-misfires-or-runs-rough

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