Stuck in real slow traffic jam last monday, taking my disabled older brother home.
Temp gauge on dash lit up red.
Switched Aeroforce gauges to read Cyl head temp and also coolant temp.
CHT's were 252 deg F.... and coolant temps hit aprx 242 deg F.
It didn't go into limp mode, but I did a U turn and got the hell outa there..and took
an alternate route. It was 49 F outside, around 4:30 PM. Cranked up the
heat on top, full bore, with blower on full bore, then had both windows down.
That seemed to do the trick a bit, dropped it down a few degs.
IF the T stat was stuck closed, I was under the assumption that the heater would not work
inside the cabin ? Both heaters hoses were blazing hot. Overflow container was hot, and
up to the top..since the hot coolant inside was expanding. Pipe from top of eng rad to eng block
is hot. Car has a small Roush M90 blower, and the Roush aluminum intake manifold has the coolant cross over built into it's leading edge.
Both the low speed and also high speed ENG fan do NOT kick in. Normally with AC on, or heat / cold
coming out the defroster by window, the eng fan defaults to high speed.
I checked the 40A fuse, and its good. And also both the low speed fan relay..and also the high speed fan relay.
Only thing I can think of is either a defective eng fan unit, or a stuck closed T stat, ( assuming that the
cabin heater hoses have hot coolant in em with T stat closed, which I don't know for sure is the case. )
On a 2010 GT, the electric eng fan fuse is a 40A, located in slot #7.
Cooling fan relay (high) is in slot #50.
Cooling fan relay ( low) is in slot # 55
Both relays are simple SPST-NO types..with a 12 vdc coil.
Connector right at the fan is ok.
I have the low speed fan set to come on at 204 F....and high speed fan to come on a aprx 213. ( X3 with VMP software)
T stat is a 190 F unit. Normal deal, with eng idling, and hood up, in summer, in driveway, when coolant hits 204 F... low speed fan kicks in...and coolant drops to 194F, then low speed fan shuts off. Then coolant temp starts to climb..and once back up to 204F, low speed fan again kicks in.... then the cycle just repeats.
Apparently there is a voltage drop resistor in the fan housing somewhere. Resistor just drops the voltage down to aprx 9 vdc. High speed relay just shunts out the resistor for the full 14 vdc high speed mode.
What else should I be looking at ?
Temp gauge on dash lit up red.
Switched Aeroforce gauges to read Cyl head temp and also coolant temp.
CHT's were 252 deg F.... and coolant temps hit aprx 242 deg F.
It didn't go into limp mode, but I did a U turn and got the hell outa there..and took
an alternate route. It was 49 F outside, around 4:30 PM. Cranked up the
heat on top, full bore, with blower on full bore, then had both windows down.
That seemed to do the trick a bit, dropped it down a few degs.
IF the T stat was stuck closed, I was under the assumption that the heater would not work
inside the cabin ? Both heaters hoses were blazing hot. Overflow container was hot, and
up to the top..since the hot coolant inside was expanding. Pipe from top of eng rad to eng block
is hot. Car has a small Roush M90 blower, and the Roush aluminum intake manifold has the coolant cross over built into it's leading edge.
Both the low speed and also high speed ENG fan do NOT kick in. Normally with AC on, or heat / cold
coming out the defroster by window, the eng fan defaults to high speed.
I checked the 40A fuse, and its good. And also both the low speed fan relay..and also the high speed fan relay.
Only thing I can think of is either a defective eng fan unit, or a stuck closed T stat, ( assuming that the
cabin heater hoses have hot coolant in em with T stat closed, which I don't know for sure is the case. )
On a 2010 GT, the electric eng fan fuse is a 40A, located in slot #7.
Cooling fan relay (high) is in slot #50.
Cooling fan relay ( low) is in slot # 55
Both relays are simple SPST-NO types..with a 12 vdc coil.
Connector right at the fan is ok.
I have the low speed fan set to come on at 204 F....and high speed fan to come on a aprx 213. ( X3 with VMP software)
T stat is a 190 F unit. Normal deal, with eng idling, and hood up, in summer, in driveway, when coolant hits 204 F... low speed fan kicks in...and coolant drops to 194F, then low speed fan shuts off. Then coolant temp starts to climb..and once back up to 204F, low speed fan again kicks in.... then the cycle just repeats.
Apparently there is a voltage drop resistor in the fan housing somewhere. Resistor just drops the voltage down to aprx 9 vdc. High speed relay just shunts out the resistor for the full 14 vdc high speed mode.
What else should I be looking at ?