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When does secondary fan come on - 2003 Cadillac CTS

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The fans are not independent. They operate at the same time and the same speed. If one is not working there is an issue.

Posted on Apr 18, 2014


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P1481 p1484 fault codes?

For mini cooper
P1481 - is
Type Powertrain - Manufacturer Controlled DTC - Manufacturer Controlled Description Fan Secondary Low With High Fan On Conditions
Cause Key on or engine running, high speed cooling fan enabled, then the PCM detected the fan secondary circuit was low (with the high speed cooling fan on).

P1484 -
Type Powertrain - Manufacturer Controlled DTC - Manufacturer Controlled Description Open Power Ground to VLCM Conditions
Cause Key on or engine running, then the PCM detected that the VLCM power ground circuit was open.

hope i can help you, or you can ask the 24 hrs live technical support, they will like to help you, good luck

Aug 04, 2013 | Mini Cooper Cars & Trucks

1 Answer

Map sensor, fan, secondary air system

The secondary air system is a system where an air pump puts extra air into the exhaust system for better emissions.
It has nothing to do with the cooling system.
The MAP sensor measures intake manifold vacuum to help tell the computer how much fuel the engine needs.

Sep 30, 2012 | 2005 GMC Envoy SLT

1 Answer

Secondary cooling fan not coming on

Could be a temp sensor - you would need to know what triggers the relay for that fan.
May need to get a book to have the wiring diagrams.

Jun 30, 2012 | 1990 Chevrolet Corvette

3 Answers

1995 grand cherokee limited overheats when the a/c is on

Check the fan operation to the radiator. If the secondary fan doesn't come on it can't dissipate the heat generated from the condensor. There are relays that control the fan under the hood in the electrical center. Check power and ground to both fans when vehicle running A/C on, both fans should be running. Check for blockage in front of rad / condensor.

Jan 29, 2011 | 1995 Jeep Grand Cherokee

1 Answer

Fan relay not working , fan keeps going on and off wont stay running

One of your fans works off the coolant temperature sensors input and will only engage when the coolant temperature reaches and/or exceeds a certain preset degree. The other runs off of your a/c compressor and when it engages so will the auxiliary or secondary cooling fan. Start the engine cold, turn on the a/c and listen for the secondary fan to engage then as it warms up listen to see if the primary fan engages. when it reaches running temperature. Please rate me on this answer.

Jun 08, 2010 | 1998 Pontiac Bonneville

2 Answers

Secodary cooling fan won't turn on

one should be belt driven runs all the time,once a certain temp is reached the other should kick on check your fuse and then the motor more likely the motor needs replacing

Dec 16, 2009 | 1995 Jeep Grand Cherokee

1 Answer

Secondary fan ac motor doesn't work

That fan comes on with the a/c compressor to assist cooling while a/c is in use....diagnostics must be performed with a/c on for that fan to be energized...start at the relay in the underhood fuse/relay box and check for 12 volts to fan when a/c compressor clutch is energized

Jun 28, 2009 | 1997 Lincoln Continental

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