Last summer season my Khyber's head gasket was blown. I replaced it with a new one and mechanic told me that Thermostat valve is faulty, so he removed it.
Before the start of this winter season I installed a kabli thermostat in it. But the car is running cold. Fan is automatic. The temperature gauge keep sitting on C. The gauge is not faulty because if I get stuck in traffic, it rises a little.
The heater of the car is also not working as it used to work. The air it throws is normal air, not cold not hot.
What can be the issue? Can it be due to radiator cap or a very very small leak in the cooling system?
I pour almost a glass of water in coolant reservoir after 2 weeks.