Question about 1996 Chevrolet Blazer

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I can not get the high speed to work on my heater blower

This switch works fine, but I am not sure if it is a relay problem or resistor, if so, which relay works the high switch?

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  • Kenny Blake May 11, 2010

    I am pretty sure the relay used for high is the same relay used for all speeds on this model. As for the relay, it is not used on high. If you haven't checked the switch with a volt meter, I would recommend doing so.

  • Eric Murphy
    Eric Murphy May 11, 2010

    I assume you are referring the the blower control switch for your heating and air conditioning?

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  • 31 Answers

I had the same problem in mine. Instead, open the hood, and in the back of the engine compartment, on the passenger side, you will see two or three relays, they are little grey blocks about 1x1x2 inches. On mine, the middle one was burned out when I unplugged it. They cost about 12 bucks at the local auto store.

Posted on Jan 24, 2009

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2 Answers

If blower motor resistor is not working, what can i anticipate?


that would affect blower motor , no speeds, I have the manual right in front of me. if you need more info get back to me and I will try to help also check the heater relay

Feb 26, 2015 | 1994 Chrysler LHS

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Vw polo heater blower only works on full power


all speeds go through the resistor except high that is why it will work on high you are bypassing the resistor if you are sure the resistor is good it has to be the blower spped switch on the dash

Sep 24, 2012 | 2004 Volkswagen Polo 1.4

1 Answer

All the heater blower speeds work on my 1998 Suburban except the high speed. I have replaced the blower motor and the switch. What else could the problem be? I have seen some writings about a resistor but...


Hello Boco.

In your Suburban there is a high blower relay.
When the switch to high is selected it activates a relay to another circuit that is fused separately.
This fuse in under the hood marked blower fuse 3 which is a 50 amp fuse.
This is most likely the problem.
However, if it isn't then the problem becomes the relay, the switch or a broken wire.
If it isn't the fuse, contact me back here using comments and I will help you with the next step in fixing your heater blower.

Thank you for using FixYa.

KL

Jan 21, 2011 | 1998 GMC Suburban

2 Answers

I have 91 Toyota camry & just recently my fan blower on works on high, the medium and low functions don't work. Is there something wrong with my fan blower?


No.

Probably not. If it runs on high, it is probably good.
Unless is sounds slow or 'tight' on high, or squeaks or chips , etc. Run the fan with the engine off and then shut the fan off and listen and see if you can hear how long it takes to slow down. If it stops in just a second or two, the bearings are tight (dry). If it spins down normally, maybe three to eight seconds or more, the motor is fine. You really don't need this check.

It is most likely your blower relay.
Most cars have one or two relays to control the fan motor, which is a single speed motor that the relays and speed switch and blower resistor control the power to.

One relay is for high speed, also switch contact.
One relay is for other speeds and divert current through a blower resistor located by the fan duct under the dash or under the hiid by the fan.
Also the switch contacts for each speed.

It cad be the dash switch, which has to handle the blower resistor current for all the lower speeds is burned out at those speeds.
It can be the low speed blower relay, as I mention above, is burned out, this is most frequent cause.
it can be the blower resistor is burned out, this can give no low speeds, or loose speeds below a certain speed setting.

Try you manual for the blower relays' positions. Try swapping with the horn relay to test if it is the same type of relay.
Take out the blower resistor carefully (pretend you are defusing a bomb or playing "operation" game as it has exposed coils that are delicate and if you bump the sides of the opening as you extract it you will damage it and short the coils against each other). the wire coils are very fine bare wire coils that look like springs and if touching can burn out.
Switch is harder to test because hard to get at, check the other things first.
You should be able to test for voltages at the resistor plug to see if power is coming from the switch, but wiring schemes can vary.
Post back or use shop manual to troubleshoot the switch.

Oct 29, 2010 | 1991 Toyota Camry

3 Answers

I only get the fan to work on high speed, the lower speeds do not work


Hi!!
The Blower Motor Resistor also called Manual Temp. Control resistor), is fried, replace. The price with floor console $25 and without floor console $65. here is a pic.
87b9810.jpg

the resistor is located on the blower motor housing, fastened by two screws. It is the part where the electrical plug connects, the plug on the pic. goes to the blower motor.
A HELPFUL - 4 THUMBS rating for this solution would be greatly appreciated. Thank you for using FixYa.

Oct 19, 2010 | GMC Yukon Denali Cars & Trucks

1 Answer

Heater fan just quit working. Cant find a fuse for it anywhere. Checked the relay and the switch and they seem fine.


Blower Motor not working for all speeds or not at all.

What does it take to get air to come out the vents?

1. Power from the battery or alternator, wiring thru a fuse and possibly an accessory relay to the switch

2. Switch and wiring to channel voltage to the appropriate resistor corresponding to the desired speed

3. Resistor set to reduce voltage to the blower for settings less than high

4. Final wiring to blower and blower itself

Because there is usually no relay between the switch and the resistor, all of the blower current runs through the switch. This sometimes causes the switch to overheat and fail over time. Depending on how the switch is designed, the failure may allow multiple currents to run to the resistor pack, and this may in turn cause the resistor pack to overheat and fail. An example of the circuit I'm describing is shown below:


88d29df.gif

Note that if the above switch was to contact both terminals 2 and 3 simultaneously, there would be more current than the resistor pack is designed for. This can burn the resistors and/or blow the thermal breaker. Also note that if the resistor pack fails, the blower can still run at full speed.

Troubleshooting: The last sentence above is a clue.

If your blower is working only on high speed, the likely cause is a failed resistor pack. However, because of the other discussion above, you should also troubleshoot the switch to see if it is the reason the resistor pack failed.

If the blower does not work at all, odds are that the problem is the fuse, relay, or the motor itself.

Repair: The resistor pack is installed in the air stream of the system to help cool the resistors. It is usually accessible from under the dash on the passenger's side or sometimes from the engine compartment along the firewall. It is identifiable by the connector with several wires coming out-some going to the switch and some to the blower motor. The resistor is replaced by unscrewing it from the duct and reinstalling the new resistor pack.

The blower is usually accessible from above the passenger

Sep 21, 2010 | 1984 Toyota Celica Supra

2 Answers

Heater blower works on high speed only. Manual


most likely ur multi-switch[fan selector switch] test out put for the other speeds if no output replace switch if good test motor

Mar 03, 2010 | 2001 Chrysler Town & Country

2 Answers

Last week the heater blower motor stopped working on intermediate speeds and would only work on high. Today after working for a little while on high I lost all speeds of the blower motor. Is it the switch...


resistor for sure, the switch would have caused all speeds to fail as it only has one moving contact but the tapped wirewound resistor is a common part for this fault.

Jan 13, 2010 | 1995 Chevrolet C1500

2 Answers

My 02 Stratus heater only works on high. Any idea


Your blower resistor is bad. It controls the mutiple speeds to allow you to go from low/med/high. When it goes bad you get one speed or no speeds....It's about $20-$50 at any local auto parts store. It mounted directly to the speed switch or on the heater plenum unit on the passenger side behind the glove box....

Nov 05, 2009 | 1999 Plymouth Breeze

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