Well I bought a new wire with a pigtail that I'll install tomorrow, and I'll see if that fixes my problem. Whenever I need to push on the gas, or the car has to go up a hill or downshift, the gauge goes above midway, and I can hear the fans kicking on high but then turn off after a minute. And then the car gets seriously hot and lose all its power. The car behaves normal in traffic or idling, but whenever I'm seriously driving it the temp suddenly increases, fans go on high then turn off, and then the car gets seriously hot because the damn fans are off. One thing I noticed is that when the fans turned off while it was still above midway, I fiddled with the lousy temp wire, and then the temp gauge suddenly decreased without the fans even coming on. I'm no coolant expert, but I don't think coolant can become colder suddenly in a running car with no fans.
No I did not lose coolant before, and no, there's no white smoke or milky oil. I've had mild overheating problems with the green coolant, but nothing that stopped me from driving the truck. I've posted a picture of the wire above, do you say it could cause all of the problems I'm having? I can see some exposure near where the wire meets the plug.
I swapped my clutch fan for electric OEM ones with a harness from JustChevyTrucks. What happens is that when I'm driving, the temp gauge suddenly goes above midway, and I hear the fans kicking on high, and then turn off after a while due to what I think is a shorting stopper that's in the harness, and then the car gets too hot because the fans are off. All this happens when I'm accelerating, or just cruising on roads.
I'm positive it's not an air bubble because I changed the coolant twice and the issue didn't change. I tried splashing water on the radiator when it's cold to get any dirt out, still nothing. But I'll have to note that the coolant temp sensor cable looks so thin and fragile, could it be that it's sending a wrong reading when the engine is accelerating?
I did a coolant flush on my 5.3 '03 Sierra and changed the fluid from green to Prestone orange coolant. I had mild overheating issues prior to the flush, so I figured flushing the coolant and changing to orange Prestone might help (I did the same exact thing in my '04 GTO with LS1 and haven't had overheating issues since forever). Now the temp always goes above midway, and here's the thing... It does the same thing even on the HIGHWAY with fans on high speed, and it sometimes goes down in traffic only (basically when I'm not giving the engine any acceleration). I changed the coolant again with dexcool, and did an air bleed, changed the temp sensor and thermostat two months ago, and cannot see any leak from the pump but still nothing is helping. I'll note that the green coolant didn't look dirty when it I flushed it out, and that it only heats up when I'm accelerating.
Update... Changing the temp sensor to the original GM didn't do anything. Here are pictures of the custom harness placed in the fuse box that's made for the fans. Does anything appear out of the ordinary? If two of the wires' places are switched, would they cause this problem?
I already don't like the idea of installing a different sensor just because it is "supposedly" better. I will try to install a GM sensor and come back here with how it went.
Yeah I think so. It was installed in the fuse box with the wires.
He converted the fans from a belt driven one to electrical. He made a custom wiring harness and installed a new Mercedes temp sensor because he was told it worked better in a hot climate. The problem he has now is that the radiator fan works in reverse. When I put the key on the "On" position and start the engine cold the fan is still on. And when the engine reaches the operating temp, which is about half way of the gauge, the fan turns off. Basically the radiator fan works in the reverse order of what it should. That's the problem.
I did try the car myself. When I turn the switch to "On", the radiator fan turns on. Does that mean it's wired in a wrong way? He did tell me that the temp sensor on the car is for a Mercedes that's supposedly works better in hotter climate.
Nemesisdawn posted a topic in 1999-2013 Silverado & Sierra 1500Hello. My brother seems to have a bit of a weird problem. He recently swapped his belt driven fans for an electrical ones. He did all the wirings and changed the temp Sensor. Although the AC fan works fine, It seems that the radiator fan turns on instantly when the engine is cold, but when the engine reaches the operating temperature it turns off and stays off. What could cause this? Did he flip a wire somewhere?
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