Question about 2000 Pontiac Grand Am GT

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The heat only comes on at one speed only high

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The balast or fan speed controler is burned out. it should be near the fan under the dash on the passenger side. there is no repair other than replacement.

Posted on Nov 13, 2009

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Change the blower motor resistor. its located on the airbox under the passenger side of the dash

Posted on Nov 13, 2009

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1 Answer

Heat makes a screaming sound - only comes on when on high, air does not come on at all - A little advice and help needed. THANKS


The screaming sound is the blower motor bearing. the fan speed switch controls the grounding side of fan motor once on high it grounds the high speed fan relay. so lower speeds goes through blower motor resistor. this may be burnt out do to bearing is screaming tight to shaft creating a larger ampere draw that burnt it out.

Nov 13, 2013 | 1997 Chevrolet K1500

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Nissan quest 2005 SE rear blower motor heat is in high speed i put a new resistor and still same problem


NISSAN QUEST 2005 SE ,FRONT BLOWER RUNS AT HIGH SPEED ON HEAT/AC,EVEN WHEN THE LED INDICATORS SHOWS DIFFERENT SPEED

Mar 18, 2013 | Cars & Trucks

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When putting controls to heat position without defrost air conditioning and both cooling fans come on, what is the problem?


need more info. It may be in fail safe mode.

Are you saying engine cooling fans both come on at high speed when you are in heat mode? They should come on low speed when ever a/c compressor kicks on.

Nov 22, 2010 | 1999 Mercury Sable

1 Answer

At high speed engine temperature is Ok, at low speed or idle it warms up to over half way and the coolant level warning light comes on. There is plenty of coolant, an new water pump and a new thermostat....


is cooling fan coming on?? the coolant level light pertains to a sensor that is in radiator side tank that is notorious for going bad you may have two seperate problems normal temp at high speed tells me the wind passing across radiator is keeping cool when stopped or in traffic as temp increases pcm commands fan to come on if it does,nt you will heat up

Mar 19, 2010 | 2000 Oldsmobile Silhouette

1 Answer

Still want to shoot into a thermal runaway.


First of try to understand exactly what part you mention exactly how they work or function
  1. please place a new low speed relay as it try to make out thermal heating cool at it's initial 1st stage level of heating so that the temperature remain maintain if thus it reaches the second level of heating then the high speed relay act at that time & the speed of radiator fan increase to get thermal heating in control.
  2. the thermostat regulate the heating temperature of the engine it senses the temperature & signal to the relay the relay then react according to the temperature level of engine at low heating it operate the low speed relay & high temperature it signal to high speed relay so the engine temperature does not rise to extended level of heating or overheating.
  3. see for thermostat valve is failure if that so replace it new sometime most of the mechanic change it or cancel it so that the temperature does not rise as this thermostat help engine maintain it's ideal temperature which is required by the engine for regular or good working even at extreme climatic condition.
  4. Do check for every tensioner or Ideal Bearing as far consider on the No. of miles or Km the vehicle has run according to us the tensioner or ideal bearing are suppose to be replace at an interval of 30000 to 35000 Km. but this replacement include both Engine timing belt & tensioner & ideal tensioner bearing.
  5. A water pump flow depend on the tension of the drive belt some vehicle come with water pump which drive on inner timing belt tension & some on the fan belt or external tension belt of engine.
for further more FAQ do send in or place your problem we will sort it out till then have a safe drive & happy motoring from siddhanth.....!

Sep 29, 2009 | 2003 Chrysler PT Cruiser

1 Answer

Blower doesn't work at high speed


you will need to replace the fans blower resistor. its mounted in the cab. in the lower right side of the heater box. some aftermarket suppliers are carrying the part but all chevy or gmc dealers will have it.
good luck chris

Mar 15, 2009 | 2003 GMC Envoy Xl

2 Answers

Front blower motor doesn't work, rear does


yes, all blower motors have them to control their speed, High, medium, low.. etc. I earn nothing by helping you, but my rating, a fixya rating and I will walk you through this

Dec 20, 2008 | 2005 Chrysler Town & Country

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