Question about 1994 Toyota Pickup

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Car comes close to overheating while doing highway speeds

When i turn on the heat and turn the fan setting to high the temp goes down at least half. is the problem the thermastat or the fan cluch?

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Sounds like either the thermostat or water pump. Either way, there appears to be a lack of circulation in the cooling system. Check the overflow reservoir. If it's backing up or not taking coolant, it's likely the thermostat, if it's working correctly, I'd lean toward the water pump.
All the best.
Greg

Posted on Jun 20, 2009

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We borrowed our daughter's Hyundai Santa Fe to make a trip to the mountains on a 105 degree day. It was doing great on mountain highways until we stopped after about 3 hours.


May be a bad fan or thermal switch not working. The a/c condenser sits in front of the radiator. It may be that the load on the engine going up the mountain is too much for just the air blowing across it to keep it cool, and the car shuts the a/c off to try and keep engine temp down. Cruising along on level ground is enough to keep things cool. Going up the mountain means more engine heat and probably reduced speed, which reduces air flow, especially if a fan isn't working.
Let car cool off, start engine and let it warm up without driving. Monitor temp and fans. When temp gets about normal, look for fan to kick on. Then when turning on a/c, look for the other fan to kick on. Don't let engine overheat. If one or both fans don't come on, start there. Check fan motor not locked up, relay working, fuse/wiring good.

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If the temp goes up at idle and is fine when your driving at highway speeds than the most likley problem is the cooling fans are not working.

the first thing you can do is check to make sure both of the cooling fan fuses are good. you can also check continuity of the cooling fans with an ohm meter.

The cooling fans are turned on by the low and high speed cooling fan relays. you can try swapping the relays.

If the fans still do not come on than you will need a scan tool to diagnose further since the PCM is what controls the fan relays.

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1 Answer

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If the temp goes up at idle and is fine when your driving at highway speeds than the most likley problem is the cooling fans are not working.

the first thing you can do is check to make sure both of the cooling fan fuses are good. you can also check continuity of the cooling fans with an ohm meter.

The cooling fans are turned on by the low and high speed cooling fan relays. you can try swapping the relays.

If the fans still do not come on than you will need a scan tool to diagnose further since the PCM is what controls the fan relays.

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When driving down highway only, it overheats? When running steady, I take it you mean, sitting idling? If it's only overheating at highway speeds, and all else has been checked out & is o.k., I'd take a close look at rad hoses for soft spots (easy to squeeze) that may be causing hoses to collapse at highway speeds & restricting flow of cooling system. Another thing to try is, turn your heater on high fan & high temperature when it starts to heat up & see if temperature gauge goes down (cooler) at all. If it does, then rad not doing it's job properly.

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