Question about 2004 Chevrolet TrailBlazer

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04 trailblazer heat and ac works when it wants, very inconsistant

Sometimes it works on high speed and sometimes it works on low. Mostly it doesn't work at all. It does not have a manual control head.

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Have sex with it,.. it will feel better promis

Posted on Jan 02, 2009

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1 Inspect Cooling System Mix Coolant level low or flow is restricted. 04 trailblazer heat and ac works when it wants, ve - grey_line.gif 2 Inspect Belt Incorrectly routed, adjusted, tensioned, missing, or worn water pump belt(s). grey_line.gif 3 Inspect Oil Pan Gasket - Performance Ruptur04 trailblazer heat and ac works when it wants, ve - grey_line.gifr leaking radiator hose. 04 trailblazer heat and ac works when it wants, ve - grey_line.gif 4 Inspect Radiator Cap Worn or damaged radiator cap 5 Inspect Thermostat 04 trailblazer heat and ac works when it wants, ve - grey_line.gifstuck closed grey_line.gif 8 Inspect Water Pump Damaged, worn or leaking water pump04 trailblazer heat and ac works when it wants, ve - grey_line.gifc="http://i.fixya.net/uploads/images/grey_line.gif" alt="grey_line.gif" class="h_mi" /> 9 Inspect Intake Manifold Plenum - 04 trailblazer heat and ac works when it wants, ve - grey_line.gifking water pump gasket. grey_line.gif 04 trailblazer heat and ac works when it wants, ve - grey_line.gift Cooling Fan Control Faulty cooling fan control or circuit. grey_l04 trailblazer heat and ac works when it wants, ve - grey_line.gifs= 11 Inspect Cooling Fan Switch - Radiator Faulty radiator cooling fan switch o04 trailblazer heat and ac works when it wants, ve - grey_line.gif grey_line.gif 12 Inspect Engine Te04 trailblazer heat and ac works when it wants, ve - grey_line.gifsor Faulty engine temperature sensor or circuit. 13 Inspect Temperature Switch Damaged or faulty temperature switch or temperature switch circuit. grey_line.gif 14 Inspect Fan Clutch Worn, loose or faulty fan clutch. grey_line.gif 15 Inspect Ported Vacuum Switch Damaged, leaking, or faulty ported vacuum switch. grey_line.gif 16 Inspect Radiator Obstructed radiator core or radiator cooling fins. grey_line.gif 17 Inspect Head Gasket - Performance Head gasket leaking coolant into cylinders

Posted on Nov 26, 2008

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  • 324 Answers

Replace the control wether it is namual or digital, this is the only thing that will cause it to act abnormal.

Posted on Nov 26, 2008

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1 Answer

Ac/heater control panel gets VERY HOT to the touch, What could be going on ?


Turn the blower fan on high and see if the heat goes away.
It may be the low speed fan resistor, sometimes it's directly behind the control.
Did you try other settings? Heat instead of AC, AC regular vs AC MAX, or just Vent?
You didn't tell us what vehicle or year and we're not the psychic hotline, so this is my best guess.

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Blower motor doesn't pump well even the fan switch on high


sounds like blower bearings are dried out and will eventually lock up the blower..sometimes you can spray wd40 in the blower bearings and it will work fine for a while.. also check vacuum controls to the baffle dors in the ductwork..may have some leaks there.. should hear a slight hissing if really bad..repost findings

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Filled Coolant reservior and radiator Drove trailblazer at highway speed no cooling problem. When slowed down in traffic temperature increased to about 220 and higher, could hear coolant bubbling in...


If there is bubbles occurring even inside the top part of the radiator (where you have the coolant put in), you may have a leak on your head gasket. You may be loosing coolant through the engine.

Sep 15, 2011 | 2004 Chevrolet TrailBlazer

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2005 Trailblazer EXT. Blower speed control not working...


Problem with blower motor is the blower motor resistor. They are usually located next to the blower motor, a couple of screws and a couple of plugs and your done. Autozone sells them for around $30 each. Wipers you may want to check for relays under the hood in the fuse block. There may be 2 relays 1 for low and 1 for high. I have switched relays from other working accesories and got wipers to work. Sometimes bad connection.

Mar 19, 2010 | 2002 Chevrolet TrailBlazer

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Heayer doesn't work


The resistors provide resistance in the circuit, dropping voltage to the blower motor to slow the motor speed down. On high, the blower receives full voltage through the blower relay.

If you had High but no other speeds, then the resistor pack is usually the culprit. If you have all other speeds but high, the most common problem is going to be the blower motor itself, relay, or the switch panel.

You can check this by turning the fan speed to "high", unplug the blower motor, and check to see that you have roughly at least 12v at the plug. If you have 12v, that means the switch panel is activating the relay and the relay is working. Over time, heat kills the magnetic properties of the magnets inside an electrical motor. Without enough magnetic energy, you may not get enough opposing force to spin the rotor full speed when the windings energize, but still enough to spin at lower speeds.

Another thing you can check is the connector at the blower motor and the switch panel. Sometimes these will heat up, start to deform, and cause a bad connection. The bad connection may be able to handle the lower current draw on low speeds, but the higher resistance from the bad connection won't be able to handle the higher current while in the full speed position.

Hope this helps, keep me posted. be glad to help you get your heater working again soon.

Jan 07, 2010 | 1995 Chevrolet Tahoe

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Vent


Get a new blower motor and relay.

Apr 28, 2009 | 2004 Isuzu Rodeo

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Fan blower for heat


bad switch or resistor block for fan speed.
sometimes the resistors or coils open or bend,in which case the fan would come on on high

Jan 21, 2009 | 2005 Chevrolet Trailblazer Ext

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04 Chevy Trailblazer HVAC Blower Problem


This is the first time I have heard of this problem. It's not to say it's not common. Try the salvage yard first obviously cause its cheaper. If problem presists contact the dealer for advice.

Jan 12, 2009 | 2004 Chevrolet TrailBlazer

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1987 Toyota motorhome 22RE engine cooling inconsistent


I think you have a leaking head gasket, very common on this engine.

Sep 22, 2008 | 1987 Toyota Pickup

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