>Be 10f out
>Drive on highway at 55MPH for 30 minutes
>Coolant temp drops to 0 on coolant temp gauge.
>Heat becomes luke warm even on max heat.
>Get back home.
>Pop hood and touch upper radiator hose.
>Probably 90f at most.
Do I need to block my grille with cardboard?
Picture unrelated
>18420573
thermostat likely stuck open
your thermostat stuck open?
sounds like your open is stuck thermostat
You suck.
Why?
Depends on the engine, some of those 3 and very small 4 bangers like in the old fiestas would literally not get hot enough to put out useable heat. Especially not at 10 F.
Car is a 1998 Lexus LS400 (1UZ-FE VVTi)
I've had an s10 that wouldn't maintain running temp in the cold even with new stat. Cardboard in front of the rad ftw, but be mindful of engine temp when it gets warmer or when stuck in traffic.
Probably a stuck open thermostat then. Any V8 should provide usable heat even at 10 F.
I know the 5.0 in my 2000 explorer will burn me out of the cabin within 5 mins of it being cold started. Not to mention that even moderately aggressive acceleration will increase the heat coming out extensively.