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My 2004 3400 closed system ,runs hot in town unless heater is on. driving up a mountain pass it gets very hot.on a flat highway runs normal. new t state,resivior cap, both fans work no leaks or smell


Radiator fan motor or radiator fan thermostat defective/

Also there is a relay that operates the fan motor

In town not enough air passing through radiator allowing it to over temp.. With heater fan running acts like cooling fan keeping engine cool

Highway driving ample air passing through radiator without fan.

Hill climbing requires cooling fan/

Hope this helps?

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Nov 17, 2016 | Cars & Trucks

1 Answer

The cooling fan comes on five minutes after starting


Unless you have the A/C on, that may be normal. The cooling fans only run once the coolant temperature exceeds about 215 degrees. It runs until the temp is down to about 200 degrees. The fans will cycle on and off as necessary to keep the coolant within that range. When the car is in motion, the airflow thru the radiator is normally sufficient to keep the coolant stable and the fans do not run. Only if you turn on the A/C will the fans runs constantly, since the A/C system needs constant airflow thru the evaporator.

Nov 03, 2016 | Cars & Trucks

1 Answer

My ac is not working I have a Chevy Tahoe 2005 the fans won't turn on either .


Hi Maria , The A/C system wouldn't keep the fans from running but none working cooling fans will keep the A/C from working ! This is a fairly complex system if your not familiar with this sort of thing ! I will add the description from the factory service manual.
Cooling Fan Control - Two Fan System
The engine cooling fan system consists of 2 electrical cooling fans and 3 fan relays. The relays are arranged in a series/parallel configuration that allows the powertrain control module (PCM) to operate both fans together at low or high speeds. The cooling fans and fan relays receive battery positive voltage from the underhood fuse block.
During low speed operation, the PCM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. This energizes the low speed fan relay coil, closes the relay contacts, and supplies battery positive voltage from the low fan fuse through the cooling fan motor supply voltage circuit to the left cooling fan. The ground path for the left cooling fan is through the cooling fan s/p relay and the right cooling fan. The result is a series circuit with both fans running at low speed.
During high speed operation the PCM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. After a 3 second delay, the PCM supplies a ground path for the high speed fan relay and the cooling fan s/p relay through the high speed cooling fan relay control circuit. This energizes the cooling fan s/p relay coil, closes the relay contacts, and provides a ground path for the left cooling fan. At the same time the high speed fan relay coil is energized closing the relay contacts and provides battery positive voltage from the high fan fuse on the cooling fan motor supply voltage circuit to the right cooling fan. During high speed fan operation, both engine cooling fans have there own ground path. The result is a parallel circuit with both fans running at high speed.
Do you have a check engine light lit ? The thing to do would have it check at the dealer or a ASE certified repair facility ! They could hook up a advanced scan tool an diagnose fairly quick ! Or you could find a wiring diagram an try testing with a volt meter yourself ! But watch yourself so you don't short out the PCM - engine computer !

May 01, 2015 | AC Cars & Trucks

2 Answers

Cooling fan keeps running after engine turned off on a 1996 ef ford falcon


Some fans do keep running after engine is switched off for a short period of time (up to 5 minutes) Check with a service person (ford) to see if that is the case or if you have a faulty sensor.

Apr 06, 2013 | Cars & Trucks

1 Answer

Radiator fan makes noise for a bout 5-10 min after start


There may be a problem but some cars keep the radiator fan running after motor has been turned off to help cool the engine. My car uses this system but if it is cool out (below 60 degrees) it will not keep the fan running.

Sep 26, 2012 | 1998 Cadillac Catera

2 Answers

Why does the fan keep running on 2005 jetta after turning off


You are talking about the thermo electric cooling fan, its operation is independent of the car's electical system. It is switched on and off by the engine temperature. When you park, the engine heat soaks upward to heat the thermostat turning the fan on. It will run until the engine cools down and the thermostat switches it off. Quite normal operation.

Apr 19, 2010 | 2007 Volkswagen Jetta 2.5 Sedan

2 Answers

The cooling fan keeps running on draining the battery


A STUCK CLOSED COOLING FAN RELAY WILL CAUSE FAN TO KEEP RUNNING.REPLACE COOLING FAN RELAY.

Apr 13, 2010 | 1995 Volkswagen Passat

1 Answer

The cooling fan keeps running even when the car is shut off. It keeps running until the battery gives out.


The fan is suppose to run until engine cools off. If battery drains before cooling down a good place to start is a weak battrey

Aug 03, 2008 | 2006 Dodge Grand Caravan

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