heater on my 2003 vectra

[Simeon Pallatt]

Realising that the heater blows cold air fine and the ac works fine. But only gets slightly warm not hot, is this right or have a got an issue? If so how do I resolve this. Thanks

 

[evocarlos]

it should burn your eyes out after about 5 mins of running
could be an issue with the thermostat if its open all the time would take a age to get warm
see if there's water coming out of the top hose on the reservoir all the time when the engine is running that would show the thermostat is open