Rad fan makes car shake 2003 sunfire

post all signs of overheating.

1. dash guage
2. STEAM eruptions>?
3. AF (antifreeze ) leaks?
4. CHeck engine light sticks on running?
5. Scan tool shows way hotter than 200F? "ECT PID" parameter.
6. oil in the AF? cold you see oil floating in the neck of the rad cap off?
7. AF found on the A/T tranny dip stick end?
8. Loosing coolant (drops) all the time, Check rad directly cold.?
9. engine pings, (knock/detonation) ?
10. lost power. from engine.
11. shaking of engine. as it misfires.
12. car heater makes this odd gurgling sound?

those are the signs but. what about precondtions.
overheats only parked< and never moving fast>
yes, bad RAD fan, (or its controls)
over heats all the time>?
fan belt fell off or slips?
clogged, rad tubes. (inside)?
water pump bad, blades, rusted to nothing.?
thermostat died, as most do way before 10 years,,,,,,,
clogged system from not doing the 2year service.

Hi S, The fan is not controlled through or by the ECU. I suggest you check the connection to the fan temperature sensor. If it is disconnected the fan will operate. Refit the connector and make sure the connection is making good contact. If the fan continues to run make sure that the relay is not fused and that it is operating correctly. Regards John

An intermittent connection in the dash light circuits. That could be anywhere in the circuit...switch, broken wire, loose connector, etc.

check the rad cooling fan switch and relay

sounds like either a wiring loom is shorting across somewhere ??where ----best of british to finding it

Sounds like a short in the ignition switch. Next time it does it, try shaking and turning the steering wheel while you're turning the key to start. If this doesn't work, try cycling the switch on and off several times. Chances are, this is your problem.

is your heater set on defrost this will cause your engine fan to run because it turns on the compressor for air conditioner this helps to extract moisture from your warm air defrost  and the fan in the engine compartment helps keep it the engine cool from the extra load on the engine this is normal 

If your car makes bubbling noise and loses fluid then replace coolant cap. It fixed mine and is cheap fix.

HI.

Follow this step to keep running your sunfire.
1 - Be sure the battery is full charged.
2 - Is better if you put a battery charged
3 - Turn the key to run position and tray to start the car and leave with the key in run position,
With a watch let pass 10 minutes no less. you gonna see the security light flashing and stop flashing after 10 munites.
4 - After 10 munites turn the key to off position during 30 seconds, with watch on your hand, OK.
6-- After the 30 seconds try to star the car

I hope this solve your problem.
Please letme know.

Thank you for use fixya.

test thermostat: turn on heater...is there plenty of heat blowing?
if not, replace thermostat.
if yes, then replace coolant, but flush cooling system before new coolant goes in.