Engine runs about 15 min. then stalls and won t restart till it cools a bit

Probably either a fuel or a spark problem. You need to check for the presence of a good spark immediately the engine stops - by using a spark gap, a spare spark plug or a propriety spark indicator.

If the spark is found to be absent the fault is likely the ignition module but check all connections and the stop switch operation before replacing.

If the spark is present then the fault is probably fuel-related and is the sort of thing a tiny droplet of water in the carb could cause...

You need to look at the temp sending unit it's probably faulty anthor issue with volvo is dirty throttle body's this raises havoc on the car they idle up down all over the map also you should change the thermostat too as a precautionary measure make sure it's the right temp for your year of your car thanx Chris

Did they figure out if you are loosing fuel or spark when it fails to start up ? You would need to know which to proceed.

Check your coolant level and overflow bottle for proper fill. Or try running it With radiator cap loose to see if it still stalls. If it still stalls and coolant levels are good you need to check temp sensor. May be more than One. If you did install a new one, it may have been faulty or damaged. If all that fails then try an idle positioning sensor. The spring may be worn.

it may take some talking back and forth but i can help you fix this. does it seem like the engine stalls once its good and warmed up and wont start till its cooled down a bit? this is very common and its ussually caused by the coolant temp sender (not the one for the dash the one that runs you fuel and emissions) more or less it goes out and you car doesnt know its warmed up so it floods the motor out after a few miles because more or less the choke is stuck "on" . once the motor cools down it will typically start right back and and then repeat the symptom. ive seen other issues cause this but the coolant temp sender is very common and also a cheap fix ( just did one on a buick and the part cost 14 bucks and it took me about 15 minutes to replace). is the check engine or service engine soon light on or does it come on then go off?

no. I'd suggest to disconnect a battery for 15 mins, reconnect, wait for 5 mins and try to restart. If it doesn't help (sometimes there's a program block to prevent stealing equipment) call a dealer

try by replacing thermostat and the radiator pressure cap, this may be just the fix! make sure coolant level is fine. it sounds like it has to cool down for at least 10-15 minutes before restarting. god bless!!

are yougetting any codes could be a number of things really weak battery,alternator,something in emmissions, clogged catalytic convertor.and o2 sensor gone bad

sounds like coil problem, coils will start cold then get hot and stop. when coil cools will crank up and run till it gets hot, try to replace the ignition coil,dont think it would be a crank sensor, try a coil,thanks robert b.

coil