Well after trying to get the heater working when it was winter, by getting my other half to tap the valves, as advised, we are now finding the air output into the cabin is terrible.  (btw, we didnt fix the heating problem), so should I assume that since he knocked the valves, this has had an effect on the air flow ?  Basically I need to get the air cooler in the car if this lovely weather keeps up and dont want to just turn up as a garage looking feeble, so please throw any tips, advice or commisserations my way.

Thanks in advance

masueuk