V70 air con foul smell

Mold or bacterial growth in the evaporator is common. Where it is on the V70 I'm not sure, but it'll be down under the dash somewhere. In my 740 I was able to remove the resistor for the blower motor speed control and spray disinfectant in there.

whatever you use be sure it kills mold

Start Ac place fan on highest speed open hood looking @ firewall on Left hand drive cars spray in the opening in the cowl this is the fresh air intake you did not state what year the V70 is if an early one the pollen filter will be under the cowl replace it if a later one it is under the glove box replace it do not clean the pollen filter just replace HTH Any ? just ask Glenn K Volvo Certified Technician ASE Certified Technician

Since the AC has mold growing inside you should also have a dealer check the car computer. Make sure that the firmware is set to have the AC fan come on about 1 hour after use to blow out the condensation.

How long does the fan run for? I've considered building a little timer box to accomplish that on my 740, I've had to spray lysol into the evaporator every few years when it starts to reek like old milk.

The fan waits about 10 minutes after you shut off the car and then it runs for about 5 minutes.

For cars experiencing problems, Volvo has a two stage "cure". They spray an algicide first and if that doesn't solve the problem, they can clean out the affected area and treat it. On our 850 we have had this done a couple times. On the V70XC, the timer on the fan works perfectly.

On my S80 and V70 it waits about 1 hour then runs for 5 minutes or so. A one hour wait makes sense because it will allow built-up frost to melt.