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Blower runs constantly even with the thermostate off.

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There is a fan relay in central air conditioners that can get its contacts welded together and make the fan run all the time. Electronic thermostats can short out and run the fan all the time. Both of these faults require a new part, either a relay or a thermostate.

Posted on Jul 27, 2008

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A.c. cooling fan runs constantly on high even with ignition off and key out


A/C - Heater blower motor ! What make , model and year vehicle ? Manual or automatic climate control ? Could be a bad blower motor control module , a high blow relay contacts stuck closed .

Mar 28, 2017 | Cars & Trucks

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Rheem Classic 90-blower always running, even if the t-stat is removed


There may be a constant blower switch on the unit set to ON. This would override the thermostat setting.

Jul 13, 2016 | Heating & Cooling

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I have a Coleman Evcon electric furnace, the blower fan runs constantly and I have to shut the breaker off inside the front cover to turn it off. The switch is on auto and it runs even when the thermostat...


It could be a thermostat problem. Also it will seem to run constantly as it tries to heat and one of the elements are working which could be a sequencer problem.

Nov 28, 2013 | Heating & Cooling

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2003 GMC Envoy main blower fan runs constantly


Does the fan stay on even with the ignition key off? Do you have automatic heating and air conditioning controls? Automatic controls have a light up blue screen in the middle of the temperature controls, and there will be a button that says "Auto". If you do have automatic controls, the likely culprit of your fan staying on constantly is what is called the blower control processor. The blower control processor is a small computer that replaces the blower resistor commonly found in cars. When the blower control processor fails, it usually "sticks" on. It's not a cheap part, but is easy enough to replace if you're handy with basic hand tools and comfortable unplugging electrical connectors under the glove compartment area.

Oct 14, 2013 | 2003 GMC Envoy

1 Answer

How to replace thermostate


sounds kind of unclear but my assumption is ure looking for the thermistor which basically makes ure cabin blower work at different speeds and base on that it should always be close to the blower itself by below the dash on the passenger side or near the middle under dash, and maybe even behind glovebox in rare instances, but if u meant thermostat then that should be on the engine compartment by the right side radiator hose assy if looking directly in front of ure car looking to the back.

Dec 30, 2012 | 2005 Saturn Relay

1 Answer

What will happen if thermostat will be removed and


Good question: The thermostate acts as a valve (of sorts) allowing the engine to stay at a relative constant temp. If run without an engine will typically run too cool (this is not good as engines are designed to run at specific heats for best efficiency and motor oil too is designed to run a a designed heat. An engine can go the other way too and over heat. As mentioned the thermostate acts like a valve controling the flow of coolant thru the block and radiator. The run thru block is a long one and it will certainly pick-up heat however running without may cause the coolant to run too quickly thru the radiator so little heat will be lost. (imagine a lit candle run your finger thru it quickly and no heat exchange as it you will not burn your finger, slower you'll get the heat from the candle and burn your finger. In short use a thermostate, your engine was trully engineered to have one.

I hope this expalins it for you,
Tom

Jun 02, 2010 | 2006 Mitsubishi Lancer

2 Answers

It does have a/c with electronic climate control digital system. whats happenning is the blower will not turn off even when the off button is pushed and even with the vehicle off. so of course the battery...


Your car does have a blower module mounted onto the blower motor housing. If the wires that plug in are melted unplug it. When the get hot and melt it can make the motor run constantly when the car is shut off

Jan 16, 2010 | 1986 Cadillac DeVille

1 Answer

I have a weather king legacy furnace the a/c


means the compressor is directly energised may be some one tried to repair but he jumped the thermostat.

Sep 05, 2009 | Heating & Cooling

1 Answer

Just a little question, guys!


The blower has absolutely nothing to do with outdoor air. Having the T-Stat set to auto lets the blower come on only when the A/C-heat comes on. With the switch in the ON position the blower simply runs all of the time. Depending on your living space (high ceilings, multi-level) having the blower on constantly while costing a small amount to run can actually save some money and make you more comfortable in the summer. However most people will leave it in auto in the winter so they don't feel as if they have a draft from the air movement as the blower is in high speed in fan on position and cool modes and low speed in heat mode. Many furnaces today are equipped with a setting that allows the blower to run constantly at a lower speed or simply run for a min. or two after the A/C=Heat have turned off.

Jan 17, 2009 | Carrier XHB123D X/Y Series Heat/Cool Air...

2 Answers

BLOWER FAN WONT SHUT OFF WHEN THERMOSTATE IS OFF


The compressor coming on when the contact is pushed is o.k. they all do that. As for the blower fan not shutting off, some brands (Payne for example) the heating fan relay is a n.c. (normally closed ) relay. so if the time delay relay or thermal link are bad or not connected, the fan will blow even when it is turned off.

Aug 19, 2007 | Honeywell CT87B ROUND HEATING&COOLING...

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