1990 VOLVO 740

Typical onset: 120,000-180,000 mi

Symptoms: white smoke from exhaust, coolant loss with no visible leak, rough idle when warm, overheating under boost

Fix: The B230FT runs hot and the original single-row radiator can't keep up, especially with a failing turbo coolant return line. Head gasket failure is the endgame. Proper fix includes resurfacing the head, ARP studs, and upgraded radiator. 8-12 hours labor for head gasket alone, more if the head is warped.

Estimated cost: $1,200-2,200

Typical onset: 150,000-200,000 mi

Symptoms: no overdrive engagement above 45 mph, slipping between 3rd and OD, burnt ATF smell, transmission oil cooler leaking into radiator

Fix: The AW71 overdrive unit wears out, and the transmission oil cooler integrated into the radiator fails, cross-contaminating coolant and ATF (the 'strawberry milkshake of death'). Rebuild runs 12-16 hours labor; many owners swap in a used unit (6-8 hours) and add an external cooler. Radiator replacement is mandatory.

Estimated cost: $2,500-4,200

Typical onset: 100,000-150,000 mi

Symptoms: hard starting when hot, stumbling under boost, no-start after sitting, whining from rear of car

Fix: The in-tank fuel pump wears out and the fuel accumulator (pressure damper) loses its charge, causing pressure drop. Pump replacement is 2-3 hours; accumulator is another hour. The fuel filter clogs frequently on old gas—replace it first before chasing other issues.

Estimated cost: $400-800

Typical onset: 120,000-180,000 mi

Symptoms: blue smoke on startup, whistling or grinding from engine bay, sudden loss of boost, oil consumption

Fix: The turbo oil feed line (a banjo bolt setup) restricts oil flow as it ages, starving the turbo bearings. Turbo rebuild or replacement runs 4-6 hours labor. Always replace the oil feed line, coolant lines, and vacuum lines at the same time or you'll be back in there within a year.

Estimated cost: $800-1,600

Typical onset: 80,000-120,000 mi

Symptoms: clunking on takeoff or shifts, excessive vibration at idle, driveline shudder, visible engine movement when revved

Fix: The rubber mounts turn to mush, especially the front transmission mount. Easy DIY job, 2-3 hours for all mounts. Makes a huge difference in driveability.

Estimated cost: $300-600

Typical onset: 60,000-100,000 mi

Symptoms: rough idle, oil leaks from every seal, oil in intake, high oil consumption, smoking

Fix: The flame trap (oil separator in the block) clogs with sludge, causing crankcase pressure that blows out seals and gaskets. Cleaning or replacing it is 1-2 hours and dirt cheap. Ignore it and you'll be chasing oil leaks and replacing valve cover gaskets forever.

Estimated cost: $100-250