Why is my Honda Passport overheating and blowing white smoke?

Short answer: White smoke from a warm Passport's tailpipe plus overheating usually means coolant is getting into the cylinders: a head gasket, or a cracked cylinder head. Owners also warn that after a water pump or timing belt job, air left in the cooling system can cause the overheating that blows the gasket. Stop driving it hot; one owner's bill grew when the head turned out to be cracked.

Symptom: The temperature climbs, you see white smoke from the exhaust once warm (sometimes smelling sweet, like syrup), and the coolant reservoir gurgles or bubbles.

What to check first

1. Note when the smoke shows up. A little white vapor on a cold start that goes away is normal. White smoke when warm is not.
2. Smell it. A sweet, syrup-like smell means coolant is burning.
3. Check the oil for a milky look.
4. If the cooling system was just opened, make sure the air was bled out (filled so no air pockets remain).
5. Have a pressure or block test done, and expect the head to be checked for cracks once it's apart.

Likely causes

1. Blown head gasket. The most common diagnosis in these threads.
2. Cracked cylinder head. Found by one owner's machine shop after teardown.
3. Air in the cooling system after repairs. A member's explanation for overheating right after a water pump and timing belt job.

What it usually costs

One 2000 owner got a $2,700 dealer quote. His final bill at an independent shop, after the head was found cracked, was parts $1,550, machine shop $800 and labor $850, including timing belt work. Prices are from an owner post and will be different today.

Is it safe to keep driving?

No. Driving an overheating engine can turn a head gasket job into a ruined engine. Stop, let it cool, and don't open a hot radiator cap. Verify with a mechanic.

DIY or shop?

Shop job for head work. Bleeding air from the cooling system after a repair is a DIY job if you follow the procedure.

Recalls, bulletins and complaints in plain words

• Related recalls: NHTSA lists these recalls touching this area of the Honda Passport: 94V132000 (1994-1994 model years, engine and engine cooling). Check your VIN at nhtsa.gov/recalls. If your car is part of this recall, the dealer fixes it for free.
• NHTSA complaints: 12 keyword-matched complaints for Honda Passport 1994–2002 (of 981 unique complaints queried, NHTSA complaints API by model year, queried 2026-10-23; keywords: overheat, coolant, head gasket, smoke, cylinder head). This counts complaints that mention these words. It is not a defect finding.

What owners report

• In Engine Head Cracked - Honda Passport 2000 on Car Talk, an owner saw smoke after 20+ mile drives; the dealer changed a radiator hose, then the engine sputtered at idle and the dealer quoted $2,700 for a cracked head or head gasket. An independent mechanic's machine shop confirmed a cracked head; the final bill was parts $1,550, machine shop $800 and labor $850. Members said a pressure test can't tell a gasket from a crack until it's apart.
• In White smoke out of the Tail Pipe. 94 Honda Passport on Car Talk, an owner had overheating and white smoke after replacing the water pump and timing belts, with the reservoir gurgling. Members suspected a head gasket, said a sweet syrup smell means coolant, noted that brief white vapor on a cold start is normal, and one said the air likely wasn't bled from the cooling system after the job, which caused the overheating.

Quick tip

If you just had the cooling system opened and it starts overheating, stop and get the air bled before it costs you a head gasket.

Vehicle focus: 1994–2002 Honda Passport (built by Isuzu, related to the Isuzu Rodeo) with the 3.2L V6 or 2.6L 4-cylinder.

Safety / mechanic note

Driving while overheating can ruin the engine. Verify with a mechanic.