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I have a 2016 Silverado 1500 Ltz and the radiator fan stays on the entire time the truck is running. Also the ac don’t get cold until 10-30 minutes. Then is blows super cold all day. I changed the coolant temp sensor and disconnected the battery for 10 minutes and it still doing the same thing. I’m not getting any codes and my gauge on the inside is reading correctly and the temp is at the correct temp. Any ideas?
I recently purchased a 2005 GMC Sierra 1500 5.3l 4x4 from my brother in law. When delivered to my house, it had several issues, and since the cooling fans are run through the pcm I'll tell you all the little things in case it is connected somehow. 1) intermittent radical speedometer (all other guages work fine) will read 10-70 mph faster than you are actually going 2) "Y" fitting coming off of water pump going to coolant res and to firewall was leaking 3) P0480 CEL "cooling fan relay" and niether cooling fan engaging. What I've done: 1) replaced leaking fitting 2) Tested 3 relays for fan (2 of them were 4 prong and i energized 2 terminals, heard a click and tested for 0 resistance between other two terminals and these checked out fine by those standards) 1 fan relay is a 5 prong and I don't know how to test it but when circuit was energized the middle terminal still had resistance (70a i think) 3) found and replaced 2 40 amp fuses that had blown. RESULTS: Ran truck with A/C at full blast. Truck reached 210 and passenger side fan engaged to full speed and ran for about 10 minutes so I turned of a/c and the fan continued to run a few minutes then blew a fuse. Around this time, I noticed a burning smell and it seemed as if the driver side fan was smoking so I turned off truck. Turned on truck and driver side fan kicked on and ran about 60 seconds before blowing second fuse. Touched the metal part of fan and it scorched the tip of my finger. Question: I am new to GMC trucks and electric fans. I understand that the PCM sends signals to the fans because of information received from a coolant temp sensor and apparently something to do with the a/c. I do not know if the fans run simultaneously or if one is different from the other. I was also under the impression they run at low speed before high speed. Can I rule out a major issue such as PCM? can I rule out temp sensor? did I not properly test relays and it could be a relay? Could the fans be turning on but still be the culprit? Any help at all is much appreciated.
Intermintent Cooling Fan problem
SB42 posted a question in Ask the GM TechnicianI have electric fans on a 06’ Sierra 6.0. Twice in the last 2 months (or so) I’ve had them not turn-on when they should have been on. I happened to notice because I could smell it running a little hot and my temp gauge was all the way to 210-ish. I switched on the heat to help dissipate the extra heat. When I started the truck up a few minutes later the fans turned on and all was well. (not that it should matter but I was at 8-9K ft. both times. I know this impacts the coolants’ properties but I wouldn’t think it would have any impact on the fans themselves) The only work that’s been done on the truck lately was some fluid flushes including the coolant. Seems unlikely that this would be related but thought I would mention it. Prior to me realizing it was the fans, I tested the coolant to ensure that the dealer put the right mixture in and it tested fine. The first time this happened I thought maybe they disconnected the fans during the flush process but verified that the connectors looked fine and since the fans have been running since, I ruled that out. What do I need to check next? Seems odd to me that its intermittent. Seems like it’s a sensor type issue of some sort but that doesn’t quite click for me since the gauge is reading fine. Could the thermostat be acting up? I couldn’t quite wrap my head around how that would influence the fans…. Let me know what y’all think I need to check next. Much appreciated! Sam