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My toyota previa overheats . it is ok sitting idling. When driving it can start to overheat after about 30 minutes or more. Putting the foot down seems to make it overheat quicker , like when driving up a steep hill or mw driving. any ideas anyone. The water level is ok.
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If its done a high mileage it could be that thr radiator is clogged. If it only happens when driving slowly in traffic but not at speed, the cooling fan is probably not working.
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Sometimes with overheating its best to find the problem using a process of elimination. I would take this approach but there are probably people out there who have more knowledge than me and would be able to offer more precise advice.
I would start with the thermostat because the fact its OK when ideling sounds like the fan and switch are functioning OK. The thermostat cost around £10 (for the part) - do you have a haynes manual? To change is is normally rated 2 spanners for most cars.
Before you change it you could put some radiator cleaner in the coolant and leave it in their for a day.This should loosen off some of the debris within the system. The new anti-freeze costs around £5 so total cost £20.
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Thanks guys. i was suspecting a blocked rad. The car has done a lot of miles. has had a new thermostat. so i willl try the cleaner in the coolant.
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