I have a r33 nissan Skyline Rb25DET that takes a long time to warm up with 117k KM It will suffer in cold temperature. I'm using NGK BCPR6es copper spark plugs with 0w20 castrol magnatec, and still it doesn't make good oil pressure unless it's sunny out. It'll never warm up at night and make you feel bad. I have a mishimoto radiator and all stock other than that.
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If your car is low on coolant, that heat never makes it to the fans in your ventilation system that blow the heat your way. Check your coolant levels if your car isn't warming up very fast because if that's the only issue, it's an easy fix.
The engine has to warm up, and heat up the liquid coolant circulating throughout the engine, before any heat is available for people comfort. During winter, when outside temperatures are lower, that process takes longer. An efficient heater relies on the engine's cooling system components to all be functioning well.
A thermostat stuck in the open position constantly pushes coolant into the engine and causes a lower operating temperature. Your temperature gauge will show a needle that barely increases or remains at the lowest setting.
If the heater core is broken, or if the thermostat that measures how much heat is in the engine compartment, you are probably in for costly repairs.
Your Water Pump is Malfunctioning
Your coolant is moved around thanks to a component called a “water pump.” It’s called a water pump because the most basic coolant is water, but the coolant in your car should be mixed with antifreeze. If this pump isn’t working, your coolant will not move, and your heating system won’t feel like it’s working.
You may have a "fail safe" thermostat in the car, ie, when it fails, it fails in the open position.
