Erratic coolant fan or normal on TS 2001? - Alfa Romeo Forum
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(Post Link) post #1 of 9 Old 4 Weeks Ago Thread Starter
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Erratic coolant fan or normal on TS 2001?

My friends' 2001 1.8 TS seems to have an erratic fan? It spins briefly for short bursts before reaching 90 c and then when the engine is hot in traffic the fan does not cut-in until rather late when the engine temperature is high (around the three quarter mark) but before the last marker and does not creep into the red line. After switching-on, the fan quickly cuts-out as soon as the temperature starts to drop?

The engine does cool rapidly in clear air. I was rather shocked by the heat transfer onto the drivers' wing as I pushed onto it to check the O/S front spring! Apparently, there was a cambelt and thermostat replacement last year.

On my 1998 2.0 TS the fan engages immediately after 90 c and stays on until the engine is significantly cooler.
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(Post Link) post #2 of 9 Old 4 Weeks Ago
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You do not mention if your friend's car has A/C or not. A/C cars (excepting twin fan V6s) have 2 fan speeds acting through the same single cooling fan.

Sometimes the coolant temperature sensor can be problematic (it powers both the gauge and supplies the management system with temperature info). There was a thread about this where someone ended up having to earth a sensor wire or something to restore correct function. I must try to find that.

Anyway, if you have an issue, look at the fault guides thread as it contains links to threads.

For sake of info only, this may help.
https://www.alfaowner.com/Forum/alfa...sues-help.html (Clearing up cooling fan issues- help)
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Is the thermostat working correctly ?
Engine temp should get up to exactly 90 degrees fairly quickly, and stay there ....
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Thanks Fruity, yes it does have A/C

Quote:
Originally Posted by Fruity View Post
You do not mention if your friend's car has A/C or not. A/C cars (excepting twin fan V6s) have 2 fan speeds acting through the same single cooling fan.

Sometimes the coolant temperature sensor can be problematic (it powers both the gauge and supplies the management system with temperature info). There was a thread about this where someone ended up having to earth a sensor wire or something to restore correct function. I must try to find that.

Anyway, if you have an issue, look at the fault guides thread as it contains links to threads.

For sake of info only, this may help.
https://www.alfaowner.com/Forum/alfa...sues-help.html (Clearing up cooling fan issues- help)
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(Post Link) post #5 of 9 Old 4 Weeks Ago Thread Starter
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Is there a way to check thermostat operation?

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Originally Posted by jwq View Post
Is the thermostat working correctly ?
Engine temp should get up to exactly 90 degrees fairly quickly, and stay there ....
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It can also be the resistor mounted on the fan frame just under the top hose.
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Thanks Gazza, is it possible to modify this resistor or will it need to be replaced?
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It can also be the resistor mounted on the fan frame just under the top hose.
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(Post Link) post #9 of 9 Old 4 Weeks Ago
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I doubt it is the thermostat. When the engine is warming up, the heater hoses should get fully hot before the radiator top hose gets warm.

The high speed fan should engage at closer to 100 degrees. It uses a separate relay and separate ECU driver so your car should not overheat. The high speed fan needs the A/C to work or the wiring to be modified if it is disconnected (as per my post).
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