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2005 uplander heat fan blows but occassionally the
2005 uplander heat
fan blows but occassionally the heat won't flow -- then other times it is good and hot
not the fan but i am getting intermitten heat
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Have you checked the water pump? Also, you may want to check the oil to ensure no water is getting into it. This would be a milky color oil which would indicate a bad head gasket or head. Is your radiator fluid staying at the full level or are you losing fluid? if all of this looks good, you may have air in the system. You can google or search on youtube for ways to clear the engine of air in the cooling system.
When the temp. gauge pegs hot what was the real temp of the engine ? Hook up a scan tool that can view live data to see what temp. sensor is reporting to the PCM / ECM , use a
Infrared Thermometer to test temp at the engine . GM had instrument cluster gauge problems , bad stepper motors that control gauges . I replaced bunchesof these because people thought vehicle was overheating . 2003 to 2006 gm vehicles .
Could be numerous things. First off check the heat control valve to make sure it's working properly. If the valve is working properly then proceed to checking the heater core. See if your getting good coolant flow. If you are then go to checking switches and resistors. Most probable cause is heater core blockage or stuck heater control valve.
check your fan relays and temp sending units...turning on the heat will help dissipate heat from coolant. turning on a/c will engage secondary cooling fan...check your relays and sending units
I'm assuming you mean heat not hot enough. Possible causes are low coolant, malfunctioning thermostat, cooling fans staying on, or malfunctioning heat blend door. I hope this helps.
Could be that the thermostat stuck in the closed position, which is preventing the coolant from getting to your heater core. Cheap part to replace and a good first step.
The heat source for the fan is probably comes from the liquid coolant in the radiator. Since the temp gauge shows it to be warm, my assumption is that there is no hot liquid getting to the heat element in the AC/heat plenum.
Do the controls feel any different than they usually do? I'm assuming you have probably been using the system in the AC mode during the summer. I would try to see what happens when the different heater controls are moved. Somewhere there is a valve that is not being actuated, or a vent door that is not moving. My experience (personal) is that a door that controls air flow is not operating and that's because it has sat in one position all summer. Sorry I can't be more specific.
if temperature is over 80 degres outside, or the ac pressure over 250, it will be on all the time, but if still doing it, like abnormal, then have the a/c presuure swtch replace or inspect.
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