Why won't my 98 Volvo v70 start?

SOURCE: Coolant temp sensor

it is located where the upper radiator hose enters the thermostat housing

SOURCE: 98 volvo s70 stalling out, then finally after a day wouldnt start

If the air pump system is setting a fault, then the check valve is probably bad. If it is not addressed, eventually exhaust gases can run back through the air hose to the air filter housing and destroy the MAF sensor, causing these types of problems.

The fuel pump also fails and is a more likely cause of the stalling, and it wont set a code.

SOURCE: 1999 Volvo V70 wont start

I had the same problem with the 2000 v70 XC I bought in Dec. 08. I replaced the battery, then the antenna ring (around ignition; part of the immobilizer system), and bought new keys as sometimes the chips in them do go bad. Also, if you have a key for another car with an immobilizer system on the same keyring, take it off. The multiple signals can confuse the immobilizer system. I think the antenna ring may have been one issue as, consistent with what repairpal stated, I got a crank and the engined turned over for about a second or 2 one time and then it died. The antenna ring (and the new keys) were relatively inexpensive. That worked for about a month and then I got no crank at all.  I had the starter replaced, but in hindsight I think that may have not been the problem.  I think the problem was the starter not getting juice. The starter was a very expensive solution. About 2 weeks after having the starter replaced, it wouldn't crank again.  I took it to a Volvo dealership and gave them the history. They found a corroded wire near the starter and, at least until now, that seems to have done the trick. Labor on the wire was about $100 at the dealer. Searching Volvo forums for those who have had a similar problem, I have found that others have had the "bad wire" problem.  If you are told to replace the starter by your mechanic, my advice to anyone having this problem is to have check to make sure the starter is getting juice before replacing the starter as replacing the starter (parts and labor) cost me about $650-$700.  If they find that the starter is not getting juice, they can check for wire corrision starting at the starter and working their way back.   

SOURCE: Volvo V70 xc AWD '98 - fuel filter change

Brandonlo168,

The fuel filter can be located under the carpeted cargo storage floor at the rear of the wagon. Remove the four 10mm bolts, remove the cover. You will then see a removeable plate to the right just behind the rear passenger seat. Fuel filter can be seen through hole in hole. Replaced from underneath wagon. Be sure to make sure lines are fully inserted onto filter. Check for leaks. No smoking, extinguisher handy. Note arrow on filter for correct fuel flow.

Ron

SOURCE: 1998 Volvo V70 A/C intermittent

I AM AN ASE CERTIFIED VOLVO----MASTER TECH AND YOUR PROBLEM W`HICH IS COMMON ON ALL 850,S ANDS70,S THE PROBLEM IS PROBALLY AT LEAST 70% DUE TO AN AIR-FLOW RISTRICTION TO THE CONDENSOR FIRST IS SYSTEM AT FULL CHARGE LOW SIDE 25-33 PSI AND YOU AND I REPEAT ONLY CHARGE SYSTEM ON THE LOW SIDE THERE IS NO AND I REPEAT NO HIGH PRESSURE CONNECTOR AND WHAT I WOULD DO IS RUN AGOOD THICK WIRE FROM A/C COMPRESSOR AND A 30 AMP FUSE FROM A CIRCUIT LIKE THE HEATED SEATS FROM INSIDE THE CAR WITH A TOGGLE SWITCH AND A THERMOMETER IN CENTER AIR DUCT AND MANUALLY SHUT THE SYSTEM DOWN IF IT FALLS BELOW 40 DEGREES AND WATCH THE THERMOMETER EVERY 7 MINUTES AND THE MAIN PROBLEM IS THE ENGINE FAN CIRCUIT I HAVE DONE DOZENS OF THESE AND THE PROCEDURE IS WHAT I WROTE