schematics and diagrams: cooling fan not working

Showing posts with label cooling fan not working. Show all posts

Monday, November 26, 2012

OBD Code P1490 low speed fan relay ckt open-short

No Coolant Fan running on Chrysler Vehicle

When these problem occurs you get OBD code P1490

These coolant fan has 2 speeds. High and low speeds. These speeds are controlled by its respective relays.There are two relays.One controls high and other controls low.
There are 3 wires at the fan motor. One is ground for both fan motor speeds and the other 2 are for the high and low speeds.
To confirm the problem try these give 12 volt power from another battery source like from cig lighter or from fuse connector or from battery positive supply.Run a direct wire from 12 volt source to the fan supply wire and see if the fan starts running or not.

You have to supply power to one of the speeds and see if the fan works. You can verify it by checking the other speed as well to insure it does work on one of the speeds and that you are checking it correctly. If one of the speeds does not work then the fan will need to be replaced.

See below coolant fan and fan relay wiring diagram :-----

The yellow wire is the high speed and the green is the low speed.
Give power to each wire one by one and see if fan runs on both sped or not.It should run,if its not running then faulty fan.If it runs then its confirm that actual fan wiring is short or faulty in between.So you can get it rewired to solve the problem.

Chrysler cooling fan wiring diagram

These diagram will help.
Thanks.

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Sunday, June 3, 2012

1995Dodge Caravan: Procedure to Replace A/C Condenser Fan?

Replacing details and procedure for Air-conditioner Condenser Fan Assembly.

If you only need to replace fan then its very simple.
you have to pull it up some, tilt it downward, lift up, tilt down, lift up and out.

But for replacing condenser Assembly.

There are 2 ways. Either unbolt and remove the radiator, or remove the front grill and bumper cover. The Removing radiator is easier of the 2 methods to replace condenser.

you can remove the fan, unbolt the radiator, remove transmission lines and hoses from it and lift up enough to come off mountings at bottom and lean against engine and squeeze the condensor out.

you are not going to get it out without at least doing that much. if you elect not to do that, you will be spending a few hours fighting to get it out without success.

Labor time to replace is 2.1 hours, so it isnt a simple unbolt the condensor lines and pull out.

This details will help.
Thanks.

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Monday, February 27, 2012

Hyundai Sonata cooling fan not working

Turn on our car and let it idle if you see your fan runs. Watch the temp guage, if it goes more than half and your fan does not kick in, tun on the ac and then notice if the temp goes down. If yes, your fan switch is bad.
While trying this procedure Cover your grille first with a towel or small rug to restrict air flow.

But if fans are not running then fuse and relay controlling the cooling fans are to be replaced aone by one and checked.

see below the diagram for cooling fan relay and fuse location.
Its fusible link too.

here are the schematics: