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Old 08-27-2018, 07:56 PM   #1
not a gt
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Question Radiator fan help..electrical aspect

Hey guys, I have tossed this around in other threads , so giving it a home! Long story short, brought car to dealer with no high speed, but had low (low on at 172-174, high speed on at 181). Dealer changed CCRM, got home and put in new radiator (fan was new). Now I have high speed but no low (and fan comes on with A/C). I went ahead as well and changed reistor on the fan. Under the hood on passenger side front by air cleaner is a one fuse (30A) box that I found is for the fan. I checked and no power there with key on, upon starting and no power at fuse when I hit low fan temp setting in my tune. Anyone knew exactly when this fuse gets power? As well from a wiring perspective, is there another fuse somewhere supplying power to this 30 A single fuse? As well, can't find info on where power enters this fuse holder and where it goes out to. Any help would be great...also I did a Exhaust gas test in coolant and results were negative and I have no coolant in oil ( car tends to run hot driving..water pump about 2 years old..a stocker, and 170 Stant T stat with hole drilled less than a year old)..thanks again for any help fellow Mach 1 enthusiasts
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2003 DSG Mach 1-03 Cobra Term/T56 swap:
2.3L Whipple,3.37 Upper,4 lb.lower, ID 1000 injectors,LCD cooling mod,Billetflow idlers,200A Alt,oil cooler delete with MMR adapter plate,MM oil filter kit,FrozenBoost Heat Exchanger Flowtech L.T., Maganaflow O/R X with Magnapacks, FRRP D.S.,T-56 with 26 spline input shaft and anti venom mod with reverse lockout box, FR steel flywheel,Spec Stage 3+,Moser 31 spline axles,FR 3.73 gear
Tuned by B.Kurgan
601Hp/558/Tq
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Old 08-28-2018, 11:15 AM   #2
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Re: Radiator fan help..electrical aspect

Any thoughts and/or input?
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2003 DSG Mach 1-03 Cobra Term/T56 swap:
2.3L Whipple,3.37 Upper,4 lb.lower, ID 1000 injectors,LCD cooling mod,Billetflow idlers,200A Alt,oil cooler delete with MMR adapter plate,MM oil filter kit,FrozenBoost Heat Exchanger Flowtech L.T., Maganaflow O/R X with Magnapacks, FRRP D.S.,T-56 with 26 spline input shaft and anti venom mod with reverse lockout box, FR steel flywheel,Spec Stage 3+,Moser 31 spline axles,FR 3.73 gear
Tuned by B.Kurgan
601Hp/558/Tq
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Old 08-28-2018, 12:49 PM   #3
DSG2003Mach1
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Re: Radiator fan help..electrical aspect

how are you sure youre getting high speed and not low would be my biggest question? Would suck to be chasing it backwards. I think Id grab a test light or volt meter and check the voltage at the fan connector at low and high speed turn on temps just to be 100% sure the low leg isnt getting power.

I dunno if that fuse is pre or post CCRM. I would try to find a pinout for the CCRM (the service manual I acquired doesnt have the wiring portion sadly). Then check when conditions are correct for low speed and see if the pins into the CCRM that should trigger low speed are getting voltage. If they are then you check the appropriate pin(s) coming out of the CCRM. Then you just keep moving up or down the line based on where you lose power.
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Old 08-28-2018, 05:21 PM   #4
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Re: Radiator fan help..electrical aspect

I found issue, my normal luck kicking in...old ccrm had lo and no high, I took the new ccrm off and put old one back in and bam...174 low came one...so brand new ccrm bad, dealer will have a new one for me in the morning....thanks DSG
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2003 DSG Mach 1-03 Cobra Term/T56 swap:
2.3L Whipple,3.37 Upper,4 lb.lower, ID 1000 injectors,LCD cooling mod,Billetflow idlers,200A Alt,oil cooler delete with MMR adapter plate,MM oil filter kit,FrozenBoost Heat Exchanger Flowtech L.T., Maganaflow O/R X with Magnapacks, FRRP D.S.,T-56 with 26 spline input shaft and anti venom mod with reverse lockout box, FR steel flywheel,Spec Stage 3+,Moser 31 spline axles,FR 3.73 gear
Tuned by B.Kurgan
601Hp/558/Tq
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Old 08-28-2018, 05:57 PM   #5
TKat13
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Re: Radiator fan help..electrical aspect

thanks for taking on all the bad luck, I can get back to my car now.
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Track Times (bone-stock w/drs):60 ft - 1.90 | 1/8 - 8.67
(100 shot,E85,4:10s,Street tire):60 ft - 1.67 | 1/8 - 7.88
New build - 750rwhp; not track tested (yet)
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Old 08-28-2018, 06:48 PM   #6
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Re: Radiator fan help..electrical aspect

Lol, yea, nothings changed after all these years
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2003 DSG Mach 1-03 Cobra Term/T56 swap:
2.3L Whipple,3.37 Upper,4 lb.lower, ID 1000 injectors,LCD cooling mod,Billetflow idlers,200A Alt,oil cooler delete with MMR adapter plate,MM oil filter kit,FrozenBoost Heat Exchanger Flowtech L.T., Maganaflow O/R X with Magnapacks, FRRP D.S.,T-56 with 26 spline input shaft and anti venom mod with reverse lockout box, FR steel flywheel,Spec Stage 3+,Moser 31 spline axles,FR 3.73 gear
Tuned by B.Kurgan
601Hp/558/Tq
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