Q: cooling fans not coming on

asked by on January 04, 2017

I have replaced the cooling fans, cylinder head temp sensor, thermostat, fuses and relays. The van doesn't overheat while driving with no fans. The fans come on when I unplug the cylinder head temp sensor. I know the fans cool the ant freeze and the auto transmission fluid and the oil. Its very odd and I'm stumped. Any help would be greatly appreciated. Thank you.

My car has 68000 miles.
My car has an automatic transmission.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing


Experienced Mechanic?

Earn up to $70/hr

What others are asking

water pump replacement. 2011 Buick Lacrosse
Hey there. It does sound as though you need a water pump. Water pumps have very different sealing methods than every other component on your car. This is due to the rotating nature of the pump and the pressure in...
I can wobble the power steering pulley and the belt keeps coming off. Do I need to replace the whole power steering pump?
With no information on the make and model of your vehicle, the information we can give you may or may not pertain to your vehicle. On most make and models, yes you can swap out the pulley by itself. You...
Car wont start up again once its warm 2005 Jeep Grand Cherokee
Hello - the first thing to check is for problem codes, whether the Check Engine light is on or not. Checking for spark during one of these "warm, won't start (https://www.yourmechanic.com/question/car-won-t-start-on-a-hot-day-by-wenceslao-n)" conditions in the next step. Your symptoms are likely...
Air suspention deflating over night two to three inches
Unfortunately I don't agree that the test you have done reveals any answers. Air ride systems have one inherent weakness no matter which manufacturer has created them. That weakness would be air leaks from the air bags, air lines used...
My truck will turn over but wont start. Its making a clicking noise and then shuts off, what should i do to fix it?
Hi there. Check the fuel pump relay (https://www.yourmechanic.com/services/fuel-pump-relay-replacement) and see if the relay has failed. If the relay is working fine, then check the fuel pump (https://www.yourmechanic.com/services/fuel-pump-replacement) and see if its coming on when you turn on the key. If...
I have a 2008 BMW 335i battery died. I have been told I need to have it mated or registered to my electrical system to prevent ove
Hi there. This video is a pretty good tutorial (https://www.youtube.com/watch?v=-6Pv_5aJyr4) on removing and replacing the battery on your 335i. You may have to reset the electrics on the vehicle, which this video shows how to accomplish (https://www.youtube.com/watch?v=l-bQI016JQs&t=267s) this step. There...
Shift to 'P' range display on dash.
Hi there. The transmission position sensor may be damaged or has a short inside the sensor. Check the harness to the sensor and make sure that it's hooked up properly and has no moisture in it. If the harness is...
Car is misfiring, was told it was the o2 sensor, it's not.
Engine misfires can be caused by many different problems and are generally caused by either a spark or fuel issue or in some cases, a combination of both. Spark related problems generally will result from things like ignition coils, crankshaft...
I am upgrading the suspension on my 2009 dodge charger sxt do I need to upgrade the rack and pinion as well
Hi Natasha. Thanks for contacting us tonight. Anytime you make an aftermarket adjustment to suspension, you should always make corresponding changes to the steering system as well - as they work together and both impact suspension alignment. It's best to...

Related articles

The Best Used Cars to Buy If You're a Doctor Who Makes House Calls
If If you are a doctor who makes house calls, reliability is likely to be at the forefront of your mind when it comes to choosing a used car. You also expect a certain level of comfort. We have evaluated...
The Best Used Cars to Buy That Can Be Towed Behind an RV
Summer Summer is a great time for a road trip, but often travelers like bringing all the conveniences of home along, in the form of an RV. Then they tow their car behind it – sometimes this practice is called...
How to Use the Ford Active Park Assist Feature
There There are few driving maneuvers as universally disliked as the parallel park (https://www.yourmechanic.com/article/how-to-park-your-car). Most people still remember that terrifying sequence of movements in their driving test. Even people who live in metropolitan areas, people who must regularly parallel park,...