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Found 4 results

  1. My truck came with a block heater. It was -20 last night here in Ottawa and no more than -15 today so I thought I would plug in the block heater and see how it worked. I plugged in the heater cord that came with the truck and checked the voltage =120 v. Was curious about how much draw there is but my amp probe showed zero amps when plugged in. I checked the continuity of the cord, all good. I checked the resistance of the heater at the plug on the truck , it shows open circuit. I read on other posts about block heaters that the thermostat is in the cord itself. It appears that GM has moved the thermostat into the heater itself on the new models so that the cord cannot be tampered with. For me I would just like the heater to work when I want it to, not when GM feels its necessary, I think -15 is cold enough to warrant use of the heater. Attached are pics of the cord that came with the truck -2020 Sierra SLT
  2. I have a 2003 2500HD with the 6.6L LB7 duramax. It is currently 19F here in ohio and after plugging in the block heater for about 4 hours i started my truck. Engine temp was below 160, everything was running fine, but the check engine light was on, trans temp gauge was pegged aover 300F, and a message was on my dash that said TRANS HOT IDLE ENGINE. I let it idle for a while and it never cooled down. Drove it to the end of my apartment complex parking lot and it wouldnt shift out of first gear. Went back, parked it as it was time for me to go to work. Rarely use block heater. First time i used it since beginning of 2019. The next day(today) I went out to run diagnostics and to see what codes where being thrown. Started truck to see if trans temp was still pegged and the gauge went all the way up to red, then down to 160, then up to just below the red with no TRANS HOT MESSAGE. Drove it to gas station and it shifted hard. While idling at gas station for 5 mins the trans temp climbed into red, TRANS HOT message came across the dash and i limped it home in first gear(maybe quarter mile). Codes - P0380, P0700, P1621. Cleared codes and check engine light was still on. Could the block heater have anything to do with this at all? Maybe a malfunction from a short or something? Fluid is full, doesnt smell bad or seem burnt but i noticed a funny smell when walking away(maybe just paranoid) Please......help.
  3. Hello all, I have a question in regards to replacing a block heater cable. My LLY has been garage kept it’s entire life and has never needed to be plugged in. Recently got an L5P l, so the LLY is parked outside. Went to plug it in today and noticed the block heater cable was rubbing onto some engine components which made it tear pretty much all the way through. I’m assuming the heater itself is fine, so I’d rather not replace the whole unit, rather the cord. Do you simply just unplug the old and plug in the new one behind the passenger wheel? Any recommendations on what cord or where to buy? OEM? Or will something from an auto parts store do the trick? Read a lot about splicing, I’d rather have piece of mind that I have a new properly functions cord.
  4. I just recently picked up a new '19 Legacy, and was checking out the block heater cord as it's that time of year. It appears to have a normal plug, without the temperature sensor. Has GM gone away from these, or is the temperature sensor somewhere else? The manual says the thermostat may exist in the plug end, but I figure that's because the Duramax probably doesn't have one.
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