Question about 2000 Chevrolet Astro

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Where is the Fan motor relay on a 1995 chevy astro van with air Cond The fan works but not on high speed. I have replaced fan switch

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Check the blower resistor near the blower motor,

Posted on May 11, 2010

  • Phillip Cain
    Phillip Cain Jul 11, 2011

    I had the same problem. Needed to replace the connector behind the battery on the firewall. The contact was melted causing the power for the blower motor to be open. Needed to get replacement connector from Dealer.

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How to replace coolig fan sending unit on a 2008 chevy uplander


Why ? Did you test ? Hook up a scan tool to see if the PCM/ECM - engine computer is reading coolant temp. ? Testing not guessing ? Do you even know how the system works .

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 engine control module (ECM) 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 ECM supplies the ground path for the low speed fan relay, which is Fan 1 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 Fan 1 Fuse 29 through the cooling fan motor supply voltage circuit to the left cooling fan. The ground path for the left cooling fan is through the Series/Parallel relay, which is the Fan 2 Relay, and the right cooling fan. The result is a series circuit with both fans running at low speed.
During high speed operation the ECM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. The ECM supplies a ground path for the high speed fan relay, which is the Fan 3 Relay, and the Series/Parallel through the high speed cooling fan relay control circuit. This energizes the Series/Parallel relay coil, closes the relay contacts, and provides a ground path for the left cooling fan. At the same time the Fan 3 Relay coil is energized, the relay contacts close to provide battery positive voltage from Fan 2 Fuse 33 on the cooling fan motor supply voltage circuit to the right cooling fan. During high speed fan operation, both engine cooling fans have their own ground path. The result is a parallel circuit with both fans running at high speed.
When the request for fan activation is withdrawn, the fan may not turn OFF until the ignition switch is moved to the OFF position or the vehicle speed exceeds approximately 10 mph. This is to prevent a fan from cycling ON and OFF excessively at idle.

Feb 27, 2017 | 2008 Chevrolet Uplander

1 Answer

Where is the Fan motor relay on a 2000 chevy astro van


It is in the Fuse Box, Go to www.bbbind.com and put your Car information in and you will be able to locate the Fan Relay....

Apr 16, 2013 | 2000 Chevrolet Astro

1 Answer

Heater/acblower fan doesn't work on high. Other fan speeds work ok. what is the problem? It's a 2003 chevy astro van


Hi, check fuse 12 first. If it is good, you will need to replace the blower resistor. The high speed relay is built into the resistor. The resistor is next to the blower motor and looks like the picture below. There is a connector in the resistor and the 2-wire connector coming out of the resistor attaches to the blower. The blower is usually under the dash above the passenger's feet. You may have to remove a kick panel to see the motor and resistor. Please let us know if you have any questions, and thanks for using FixYa.

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Feb 19, 2011 | 2000 Chevrolet Astro

1 Answer

Location of a/c blower high speed fan relay 2001 chevy astro van


hi...

please check the under side of the steering wheel most probably all relays wil be placed there. check and please let me know about it.

Jun 26, 2010 | 2001 Chevrolet Silverado 1500

2 Answers

95 chevy astro van, where is the a/c clutch relay?


there is no relay power from control panel through pressure switchs to compressor

May 09, 2010 | 1995 Chevrolet Astro

1 Answer

I have a 93 chevy astro van and the blower fan keeps blowing fuses. the fan checks out good, can't locate the relay which I think may be bad. as I can unplug fan and still blows fusew.


The relay is not your problem or it would blow wheather or not the heater motor was plugged in or not if it was shorted,you need a new heater motor.

Nov 12, 2009 | 1993 Chevrolet Astro

3 Answers

On heat or air cond. the fan will only work on high. There is a small amount of air on each position of the switch and full blast when it gets to the high setting.


I had this problem in a Chevy Astro once. It ended up being the switch. Not sure if that's your fix, but it almost sounds like the switch.

Oct 27, 2009 | 2005 Nissan Sentra

1 Answer

My 2002 chevy astro van's front air conditioning doesn't work. How do I know if it is the fan switch or the blower pump?


you must remove the controlles and use a test light to dee if it sends poer to the fan it also can be the resistor pack for the fan speeds

Sep 02, 2009 | 2002 Chevrolet Astro

1 Answer

Don't get any air from vents on 1998 Chevrolet astro van. Just replaced clutch fan. Air cond. works fine and fan works fine. Is something not connected?


SOUNDS LIKE THE AC CONTROL HAS LOST VACUUM FROM THE ENGINE, YOU MAY HAVE KNOCKED A HOSE OFF WHILE CHANGING THE FAN CLUTCH, IS THE AIR COMING OUT THE DEFROST VENTS BY CHANCE?

Aug 06, 2009 | 1998 Chevrolet Astro

2 Answers

1998 Astro Van Heater AC Blower only works on medium & Low


Yes, in high it bypasses the resistor and uses a high blower relay. But I think on 1998 Astro the High relay and the resistor are built together. It should be mounted in the blower box real close to the blower motor.

Mar 09, 2009 | 1998 Chevrolet Astro

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