Hot engine...but no heat from heater | Chevy Silverado and GMC Sierra Forum
2012年12月27日 · When the engine is warm feel both heater hoses. If one is cool and one is hot then you have an obstructed heater core (or a bad heater core valve, if it has one. some vehicles use a mechanical valve to turn the coolant flow on and off to the heater core).
Troubleshooting No Heat in 2001 GMC Sierra 1500 | RepairPal
2010年11月26日 · Troubleshoot your 2001 GMC Sierra 1500 heating problem: check blower functionality, heater core temperature, and thermostat concerns for effective solutions.
Please help, no heat on Passenger side | Chevy Silverado and GMC Sierra …
2024年12月12日 · Took it back again and he replaced the control module and was getting some heat but not super hot. Parked the truck for a day and then cranked it today and back to cold air. I need help, could the new actuator be bad?
2001 GMC Sierra 1500 Heater Is Not Working - RepairPal
The most common reasons a 2001 GMC Sierra 1500 heater isn't working are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor. When the blower motor fails, the air conditioner and heater may still work, and heat or cool may be felt at the vents, but the air pressure will be dramatically decreased.
GMC Sierra 1500 HD Pickup: 2001gmc sierra has no heat
2013年2月14日 · Does the engine reach normal operating temperature on the gauge (195 degrees)? If the coolant is filled to the proper level and the heater hoses are staying cool then the heater core is likely restricted. Disconnect the heater hoses at the firewall then use a garden hose to flush water through the heater core in both directions.
GMC Sierra 1500 heater not working - causes and diagnosis
2022年10月20日 · The heater may stop working in GMC Sierra 1500 due to low coolant level or air in the cooling system, clogged heater core, bad thermostat, faulty blend door actuator, bad water pump, dirty cabin air filter, bad blower motor, or HVAC control unit malfunction.
GMC Sierra: Heater Not Working Diagnosis | Drivetrain Resource
2019年5月3日 · One of the most common (and inconvenient) problems with the GMC Sierra is when it has no heat coming from the heater. Not having a functioning heater makes driving much less comfortable, and can be a sign of certain issues. At the simplest level, there are two main reasons why the heater is not working.
Heater not blowing hot - GM Truck Club Forum
2019年3月26日 · Touch both heater hoses at the firewall when the motor is completely hot. These questions need to be answered. 1. Did you install a 195F degree thermostat? If not, change it to a 195F only. 2. Are the both hoses hot? 3. Is one hose is hot, is the other heater hose at a lesser temperature with the heater running? 4. Are both hoses somewhat cool ...
I have a 2001 GMC Sierra 5.3L and my heat blows warm but ... - JustAnswer
If both heater hoses going into the firewall are hot or very warm to the touch then the heater core is operating as it should and this isn't the fault. The most common if the coolant circuit is ok is the electric motor on the heater box that controls the hot/cold temperature door has failed and isn't allowing the hot air through the vents or ...
truck won't heat up properly - Chevy Silverado and GMC Sierra Forum
2015年1月7日 · Small hose at top of radiator to recovery tank should be the Radiator overflow hose. If that is flowing coolant and stopping that helps truck warm up properly it sounds like you need a new radiator. The radiator cap used to be used to hold the pressure in the radiator and only flow through that small hose if it overheats and overflows.