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Old 06-17-2022, 01:28 PM   #1
SparksMach1
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Cooling issues

Hey guys! Haven't been on here in a long while. I took my car to work the other day and the temp was just steadily creeping up in traffic to like 235/240 on my autometer gauge until I got on the highway and then it would come back down to around 205. Even that hot, the factory gauge still showed normal temps (which doesn't seem right). Everything was good like 3 months ago, the last time I took the car out.

Previously when driving it would normally be at like 195 and would rarely get over 200 in heavy traffic. I popped the hood and the fan is working, but it seems like it was only running the low-speed.

I am bad with electronics - can anyone help explain what I can do to triage this situation? I'm going to check coolant level to make sure i don't have a bubble in the crossover tube where my aftermarket sensor is, but i'm at a loss aside from that.

It was good catching up with some of the old crew at Carlisle 2 weekends ago!
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442/435 @ the rear ALL MOTOR -Race Gas
FRPP BOSS 5.0 block, 10.6:1 compression, Manley H-Beams; Diamond flat-top pistons, P&P heads W/ 5-angle valve job & ARP Head studs, PP upper/lower intake, Comp Stage 2 N/A cams, FR500 springs, valves, and followers, Tube K with coilovers and Bilsteins, Kooks, Stingers, 2.97 T-56 Magnum, 31 Spline Superior axles & Auburn-pro dif, built battle boxes, KB BAP w/ 39lb injectors, and 4:10's.
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Old 06-17-2022, 02:06 PM   #2
DSG2003Mach1
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Re: Cooling issues

I would bet the high speed leg died or theres an issue with the resistor.

If you look at the harness going to the fan on the passenger side you can pull that assembly out - see if it's burnt. If it looks good, with the AC switch in the OFF position start the car and let it idle until the fan comes on - that should be low speed. Then turn the AC on, very shortly after the fan should kick up to high speed.

The temp gauge on the dash is an idiot light, by the time it moves over to hot you're already way over temp.
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Old 06-17-2022, 02:35 PM   #3
SparksMach1
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Re: Cooling issues

Heck yeah, that's exactly what I needed. Thanks so much! I'll try to take a look at it tomorrow and see what's going on
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2003 AB Mach --

442/435 @ the rear ALL MOTOR -Race Gas
FRPP BOSS 5.0 block, 10.6:1 compression, Manley H-Beams; Diamond flat-top pistons, P&P heads W/ 5-angle valve job & ARP Head studs, PP upper/lower intake, Comp Stage 2 N/A cams, FR500 springs, valves, and followers, Tube K with coilovers and Bilsteins, Kooks, Stingers, 2.97 T-56 Magnum, 31 Spline Superior axles & Auburn-pro dif, built battle boxes, KB BAP w/ 39lb injectors, and 4:10's.
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Old 06-17-2022, 04:03 PM   #4
DSG2003Mach1
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Re: Cooling issues

keep in mind the tuner could have made the high and low speed fans the same temp or something goofy so it's not foolproof. I cant remember - when that resistor shorts out if the fan gets stuck on low or high speed.

if the cooling system hasnt been messed with I dont see there being air in the system short of a bad head gasket. If anything I would think a leak at the temp sensor would cause coolant to escape, not air to enter
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03 dsg mach1 - MPR built 9.5:1 motor, D1, cams, ported intake, full exhaust, magnum t56, built rear, E85 etc...

'12 F150 FX2 Supercrew with Ecoboost daily beater
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Old 06-19-2022, 09:55 PM   #5
jbrad88
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Re: Cooling issues

I purchased a spare resistor a few years back and keep it around just in case. I have also managed to dislodge it from its place in the fan shroud occasionally when working around the engine compartment.

but yes. clearly seems the high speed is not coming on as it should.
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