Is it a problem if the needle for the hot/cold engine stays lower than cold?

Hello Cheatahwoman, Yes, this could very well be an issue. A common cause for this is when the thermostat is stuck open. This can be because of a failed temperature sensor unit, meaning the coolant is not getting a signal to close and stop flowing to let the engine warm up. Another cause of this problem could be the thermostat itself is malfunctioning and needs to be replaced. Let us know if you have any other questions! RepairPal Oliver