cooling fan inop
#1
cooling fan inop
96 volvo 850 GLT 200k+ miles. Im working on it for a friend. The car overheated and he drove it until it died.
I replaced the motor.
replaced busted radiator and busted coolant hoses.
replaced stuck thermostat.
replaced dead ECT sensor.
Replaced dead and stuck coolant fan
I can ground pin 1 and 2 on the relay and the fan works. high and low
I can unhook the high pressure sensor and the fan kicks on high.
Doing a voltage drop on pin 1 of relay shows 6v, so Im getting a half a ground from ECM all the time.
Doing a voltage drop on pin 2 of relay shows 2-4 volts, Im getting 10V all the time to pin 2.
A/C compressor cycles on and off with no fan activation..same voltage readings.
Did I miss something during the install? Ground maybe? To me, the ECM seems to be also bad..but what else could effect the ground output to the relay? Or am I just reading it right and the relay activates with a 6v ground?
thoughts?
I replaced the motor.
replaced busted radiator and busted coolant hoses.
replaced stuck thermostat.
replaced dead ECT sensor.
Replaced dead and stuck coolant fan
I can ground pin 1 and 2 on the relay and the fan works. high and low
I can unhook the high pressure sensor and the fan kicks on high.
Doing a voltage drop on pin 1 of relay shows 6v, so Im getting a half a ground from ECM all the time.
Doing a voltage drop on pin 2 of relay shows 2-4 volts, Im getting 10V all the time to pin 2.
A/C compressor cycles on and off with no fan activation..same voltage readings.
Did I miss something during the install? Ground maybe? To me, the ECM seems to be also bad..but what else could effect the ground output to the relay? Or am I just reading it right and the relay activates with a 6v ground?
thoughts?
#4
toggle
I thought about a toggle switch. ..but the owner cant be trusted. He knew the car was overheating and continued to drive until it burnt a hole in every piston. Cant trust him with a switch.
I have to fix it right.
With the compressor cycling. ..with no fan...what else can I check? Besides the heater core, ive replaced the entire cooling system...anyone in mid missouri got a spare ecm I can try?
I have to fix it right.
With the compressor cycling. ..with no fan...what else can I check? Besides the heater core, ive replaced the entire cooling system...anyone in mid missouri got a spare ecm I can try?
#5
#6
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