I am also looking into the heater on my '92 grand voyager (3.3L). The heat is just about warm - certainly not hot.

I have noticed what look like 2 bleed valves under the bonnet, one at the front next to the radiator and one at the back (by the bulkhead) next to a control box of sorts.

Are these bleed valves for the cooling system and if so, how do I use them (I think I let the engine heat up then slowly release them until no bubbles appear - just fluid)

Any other suggestions for a lousy heater (if it is connected, the air-con has never worked properly, it never got 'cold', again just warm)

Mike

Change the thermostat. It sounds like the one you have is stuck open. Leave the bleed valves alone!

I agree with GTP Dad. It sound like a thermostat stuck open.