Hi, any ideas where I can start looking for a diy solution on how to fix a slow heater? The car can take a long while before the heater gets hot in -10F (-14 celc.). Engine temperature rises normally to halfway. I have standard heating system (not the clima-control) I'm suspecting a sensor. Any good tips to check out first?
7
Slow heater - Golf TSI 2015
- Thread starter ervybaby
- Start date
avenali312
Autocross Champion
- Location
- Mableton, GA
- Car(s)
- 2015 GTI
Mine in my MKV took a while back in the day and it ended up being a thermostat stuck open, but I also lived in Florida at the time, so it took me a while to even notice.
Carlosfandang0
Autocross Newbie
- Location
- UK
- Car(s)
- 2016 3Dr GTi DSG CSG
A stuck thermostat is probably a good guess.
Juggar
Ready to race!
- Location
- Franklin, NC
Well if its -10 F then yeah... its gonna take a solid 10 mins to blow hot air.
Takes more than 25 mins and up... which is too long ;((
jimlloyd40
Autocross Champion
- Location
- Phoenix
- Car(s)
- 2018 SE DSG
How many miles do you have? Ever have the coolant system and heater core flushed?
Around 40,000miles - not flushed yet
jimlloyd40
Autocross Champion
- Location
- Phoenix
- Car(s)
- 2018 SE DSG
Then that shouldn't be a reason for your problem.
not sure how to do this- block it from where? Tnx
jimlloyd40
Autocross Champion
- Location
- Phoenix
- Car(s)
- 2018 SE DSG
The front of the radiator.
Pull the plastic radiator cowl cover thing, slip cardboard between the radiator and the front bumper to prevent airflow across the radiator. Close/flat against is best. There is no specific way to “do it right”. You are just trying to keep air from flowing through the radiator.
In a working cooling system, at cold start the thermostat is closed keeping water from flowing through the system. This allows the engine to heat up faster as no coolant in the motor is flowing through the radiator to be cooled off.
Thermostats fail in the open position.
If your thermostat is failed, there is nothing to stop coolant from circulating at low temps. This means your engine is trying to heat coolant, that is being adversely cooled in the radiator, up to operating temp, thus taking longer.
In a working cooling system, at cold start the thermostat is closed keeping water from flowing through the system. This allows the engine to heat up faster as no coolant in the motor is flowing through the radiator to be cooled off.
Thermostats fail in the open position.
If your thermostat is failed, there is nothing to stop coolant from circulating at low temps. This means your engine is trying to heat coolant, that is being adversely cooled in the radiator, up to operating temp, thus taking longer.
Thanks - I will try it out this week and get back. Just to be sure which thermostat is in question -does anyone know the part number? (Golf 2015 TSI) - Tnx
Ambient Air Temperature Sensor?
https://www.fcpeuro.com/products/audi-volkswagen-vw-ambient-temperature-sensor-crp-8z0820535https://www.napacanada.com/en/p/NTCA03827?searchCategory=c12.s7&searchIndex=Universal
or
Heater Control Valve?
https://www.fcpeuro.com/products/audi-hvac-heater-control-valve-vag-4h0121671d
Ambient Air Temperature Sensor?
https://www.fcpeuro.com/products/audi-volkswagen-vw-ambient-temperature-sensor-crp-8z0820535https://www.napacanada.com/en/p/NTCA03827?searchCategory=c12.s7&searchIndex=Universal
or
Heater Control Valve?
https://www.fcpeuro.com/products/audi-hvac-heater-control-valve-vag-4h0121671d
Just to be sure which thermostat are we talking about - is it the Coolant Temperature Sender? tnx