Amp draw must be less than 50 milliamp. The differences are all in the cfm rating of the blower motors (though the new models do use about 1/2 amp less than old ones, due to no klixon blower relay, which drew ~.5 amps). Categories. I have a 2006 Chevy Silverado Ex Cab, 4Dr, 4X4 with a 5.3lt eng. Replacement of all failed, damaged, and worn components are required to ensure the blower motor runs properly and to prevent future component failures or damage to the blower motor … HVACR Product Gallery: Week of February 22, 2021, The New Flat Rate Introduces 'Section Selection' Option, Interplay Learning Raises $18 million in Series B Funding, Increase Your Income Through Productivity, HVACR Contractors Need Strong Distributor Partnerships, AHR 2019 At-A-Glance: Advanced Planning Guide to the 71st International Air-Conditioning, Heating, Refrigerating EXPO, 2019 Leaders in HVACR/Hydronics Innovations, Danfoss Releases Fixed Gas Detector for Industrial Refrigeration, Superheat and Subcooling: The Best Ways to Ensure Proper Refrigerant Charge. I would reccomend replacing the blower motor as well this time. This may be in the electrical disconnect, or at a junction box. If the amp draw exceeds manufacturer’s specifications, replace the blower motor. The resistor and pigtail was burnt up so I replaced them, but still no voltage to the motor although there is voltage to the red wire that goes into the resistor but will not go on to the motor. Before we discuss taking measurements, let’s look at safety. 5. This clamp snaps onto the power lead of the motor and measures the flow of the current pulled by the motor. The lower the better. 1-24 of 32 Results. Std cab. Wait for up to 30 minutes for all modules to go to sleep before taking a reading. Testing two or more at a time will cancel each other out or the reading will be false. When running the blower draws 8 amps, but starting is a different story. When a motor operates at 100% of its FLA, it’s operating at 100% of its capacity. On these meters, there is a selection for AC Amperage that allows for a wide range of testing sufficient for all sizes of residential blower motors. Most of us carry one of many electrical multimeters that are on the market to test electrical properties. Connect the amp clamp from your electrical meter around the power wire. Blower motor began running on high and will not shut off even when truck is turned off. The blower motor has stopped working, it did it once last summer but came out of it. If the measured amp draw exceeds the capacity of the motor, the motor will fail prematurely. If fuse is reinstalled blower begins to run again. Locate the power wire leading to the blower motor. It’s one of the lesser-used diagnostic tests, but perhaps if we focus on how to measure amp draw and learn to better interpret what it can tell us, we will expand our ability to provide comfort to those we serve. The goal of the test I’ll present here is to compare the measured amps that the motor is using to the FLA capacity of the motor. Use an ammeter installed in series with the battery cable to test for a draw. Probably a bad blower motor resistor. If the door is left off during the test, the fan will move more air than it would if it had to pull all its air through the return air ducting. The amp clamps look like a clothespin with two insulated wires that attach it to the meter. 2008 Chevrolet Silverado 1500 Change Vehicle . FILTER RESULTS. 2004 Chevrolet Silverado Fuse Diagram for Underhood fuse box. Some air handlers now have the FLA of the blower motor listed right on the nameplate of the equipment. All; Parts; ... Blower Motor Avalanche, Escalade EXT. Here’s my favorite safety quote: Whenever taking electrical measurements, or working with fans and pulleys, remember that even a fleeting misunderstanding or inattention to energized equipment may easily carry the punishment of death, enforced promptly, without the chance of appeal anywhere on Earth. TEST 1: Testing The Amperage Draw Of The Blower Motor. If there is not an exposed wire within the unit, you will have to find an exposed single lead to the motor where you can test. Because this motor draws too high of amps we can only run 2 motors/pumps at a time. 2. If the draw is over half the fuse AMP rating, the blower motor is the likely cause of the resistor failure. DDM Fuse, PDM Fuse, ECC Fuse, AUX PWR 2 Fuse STUD #2 30A Trailer Wiring Any ideas what's wrong and how to fix this? 1-24 of 36 Results. This amperage measurement is taken with the power on and a fan that often moves from 500 to 2,000 rpm. In that case, the blower motor resistor will fail repeatedly. Blower Motor & Fan for 2008 Chevrolet Silverado 1500. A broken blower motor switch can also stop the blower from changing to certain speed settings. If the motor is direct-drive these numbers can be difficult to read. Without rear ac. 2005 Silverado Crew Cab. Re: 2011 Silverado blower motor issue Sep 07 2016, 1:16pm Replacement of all failed, damaged, and worn components are required to ensure the blower motor runs properly and to prevent future component failures or damage to the blower motor … Should you ever be tempted to reach in and pull out a wire to test with your bare fingers, be aware that insulation may have been stripped from the wires and you could be headed for some serious pain, or even the punishment mentioned above. Amp draw is a measurement of the power being consumed by a blower motor to move the air through your HVAC system. Filter. Escalade ESV. Buy online and pick up in store, or get fast, free delivery on qualified orders. Also, whenever you’re measuring electricity, whether this is a new test for you or if you’ve successfully performed it a thousand times, please pay attention to your personal safety. Excessive heat is what usually causes damage to a motor, and when a motor is working beyond its FLA, its life expectancy is decreased significantly. Find the Full Load Amp (FLA) rating of the blower motor. Re: Blower motor. WVE {#12126486, 987} Blower Motor Resistor Connector; With automatic temperature control (you can set a specific numeric temperature) WVE . With some systems you may have fingers and test leads dangerously close to this moving fan. Yep- Suburban makes models that draw anywhere from 2.8 amps to 11.5 amps- Hydroflame is similar (though they have one that draws 1.8 amps). BRAND. Having said that, let's take a look at how to measure amp draw of a residential direct drive blower. HVAC Blower Motor Fan Resistor Compatible with 1999-2006 Chevy Silverado GMC Sierra 1500 2500 3500, 2000-2002 GMC Yukon & Yukon XL Replaces# 89019089, 973-004, 89018597, 22807122, RU371 4.2 out of 5 stars 20 Had to pull blower fuse from fuse panel to stop. RT DOOR CB BLOWER 40A Blower Motor LBEC 2 50A LOCKS Fuse. Check out this advanced planning guide to the 2019 AHR Expo. ACDelco (5) Dorman (2) Duralast (1) This is a test. The big problem comes when modules start waking up. Check that the blower is rotating in the right direction, that it is tight on the shaft, and that there is no restriction or grinding as the motor turns. We have pulled the pump and trimmed the impeller to reduce pumping capacity to lower the amp draw but it did not change the amp draw at all. The blower motor will run fine at the available settings, but it won’t operate correctly if you select a disabled speed. No diagnostic measurement is worth a finger. One rule of reading amp draw is that only one wire at a time can be measured. The BCM watches for current flow. The maximum amperage draw on the 1998-2003 S10 (Sonoma) is 30 Amps. A rule of thumb is that on high speed most motors will draw 70-100% of the FLA if it is moving the required 400 CFM per ton on residential systems. This symptom isn’t limited to a bad blower motor resistor. Shop AutoZone for Chevrolet Silverado 1500 Blower Motor Connector. Filter. Amp draw is a measurement of the power being consumed by a blower motor to move the air through your HVAC system. 1-8 of 8 Results. One common failure that I have seen that usually causes this is a fan blower motor drawing to many amps,this will cause the wires to overheat and melt like this. Shop AutoZone for Chevrolet Silverado 1500 A/C Heater Blower Motor. 6. There is a relay in the under hood fuse box , blower motor relay .When switched to high it energizes the relay allowing power from the HVAC fuse /30 amp to flow direct to the blower motor. To get access into the blower compartment requires a remote amp clamp attached to the end of a 3-ft. to 4-ft. cord. If you have a single-phase, multiple-speed motor with speed taps, place the unit in cooling mode with the fan switch in the “on” position and the temperature set to 55F. They are usually located on the nameplate located on the side of the motor. Price: Alternate: No parts for vehicles in selected markets. All models. Most vehicles will have less than this amount, closer to 10 milliamps. The draw should be less than 50 milliamps. Therefore, the fan will work harder and the amp draw will be higher than it would be under normal operating conditions. If the draw is over half the fuse AMP rating, the blower motor is the likely cause of the resistor failure. Vehicle. It draws 34 amps for 1 second and 30 amps for the next 3 seconds and then settles to 8. All rights reserved. 4. 1-24 of 33 Results. Buy online and pick up in store, or get fast, free delivery on qualified orders. Even if you often deal with large commercial systems, read on, the same principles apply. Normal draw on most GM vehicles is.050 and spiking to.150 amps when onstar checks in. So, if the blower motor's amperage draw is above the amperage rating of its fuse, then it' s defective and needs to be replaced. This can overheat and wear out the motor and draw higher amperage through the blower motor circuit, which can burn the resistor or control module. Check the rotation of the fan. Remember to have your test instruments calibrated annually so that you can have trust and confidence with your readings and diagnostics. If the only access to the wire is in the blower compartment, you must be sure that the test is taken with the blower door on, or at least closed as much as possible. Home 2008 Chevrolet Silverado 1500 Blower Motor & Fan. 1-24 of 32 Results. When a blower motor starts to fail it will draw a lot of amperage and that will cause the blower motor resistor to burn out. 1-24 of 36 Results. Open up the blower compartment of the furnace or air handler. Buy online and pick up in store, or get fast, free delivery on qualified orders. Rob “Doc” Falke serves the industry as president of National Comfort Institute a training company specializing in measuring, rating, improving and verifying HVAC system performance. Replacement of all failed, damaged, and worn components are required to ensure the blower motor runs properly and to prevent future component failures or damage to the blower motor … We need to see if the blower motor is drawing a high amount of current (above 40 Amps) because if it is, then it's defective. Check the relais module located inside under the rh side of the heather box you can see the connector most of them need to be replaced as they burn out you may need to replace the blower motor as well,high amp draw caused by faulty bearings will overload the blower motor controller. $8.33: $0.00: $8.33: Alternate: Quantity: Add to Cart. Record the reading and compare it to the FLA listed on the motor. 2004 Chevrolet Silverado Relay Block. If the measured amp draw is only half of the FLA, the chances are that you have a serious air flow problem that will require additional work to get the system to perform properly. Check the amp draw against the manufacturer's fan performance data to verify the airflow that the fan is producing. Shop AutoZone for Chevrolet Silverado 1500 Blower Motor Resistor. These two conditions combined will significantly reduce the life of any blower resistor. An electrical meter will range in cost from $60 to $500. motor replacing blower cause speed cost started fixed purchased completely snow control replaced today thing miles think probably already, Users browsing this forum: No registered users and 15 guests. The first thing we're gonna' do is to test the blower motor's amperage draw. Read the amp draw of the blower motor. Some meters come with a built in AC current clip that looks like two fingers at one end of the meter that wrap around the wire being tested. It’s one of the lesser-used diagnostic tests, but perhaps if we focus on how to measure amp draw and learn to better interpret what it can tell us, we will expand our ability to provide comfort to those we serve. Restricted cabin air filters (if present) and dirty evaporator cores will cause a blower motor to draw more current while reducing air flow volume. “Bump” the fan by depressing the blower compartment safety switch. To measure ampacity on most smaller systems, you clamp onto a wire in the blower compartment, then close the blower compartment door during the test. in 2008 I lost the blower completely during a snow storm come ... SilveradoSierra.com - Chevy Truck Forum | Silverado Sierra GMC Truck Forums The only site focused on Silverado/Sierra trucks exclusively. When a system has been renovated and system performance has been maximized, it’s common to read amp draw at 80% to 90% of FLA on a most direct-drive residential units.

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