Question about 1988 Honda VT 800

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What would cause my VT800C to overheat, even at idle. The cooling fan doesn't run

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First, with the motorcycle cold, take off the radiator cap and make sure thaat the engine is full to the top. Use 50/50 NON-SILICA formula antifreeze to top up the coolant(GM Dexcool), Honda, etc). Be sure to top up the over flow bottle if you are low.
The most common problem for the fan not running is the fan switch. On the radiator the fan switch has two wires going to it. The sensor with one wire is the temp sender. On some models the switches are on the radiator cap filler tube. They run close to $100. Before replacing the fan switch be sure to check that the fan motor is still working by running power directly to it. If the fan motor is bad they can run $200-$400.

Posted on Mar 20, 2011

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1 Answer

My 1994 Toyota Previa LE overheats when I put on AC. It overheats while on idle.


cooling fan not running.check for faulty cooling fan relay or fuse.cooling fan fan should be running when you turn on AC.hotwire cooling fan make sure cooling fan motor okay.

Jul 10, 2013 | Cars & Trucks

1 Answer

This isn't the hottest it gets. It goes all the way up to almost the red. It's over heating and we have changed the water pump,


A water pump in itself WILL NOT cause and engine to overheat, if it leaks badly and the coolant level drop very low then this will indirectly cause the engine to run hot or overheat. What I see in the video clip is NOT overheating, the fan doesn't come on until the engine reaches about 230 Degrees Fahrenheit, that is pretty well up about where the needle is in the video, if the cooling fan never kicks on after about 20 minutes of idle or doesn't engage when the AC (this assumes the AC is working)n issue.

Oct 04, 2012 | Cars & Trucks

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2005 grandcherokee 4.0 Overheats when idleing in traffic. WILL IMMEDIATELY COOL DOWN WHEN RPMS ARE INCREASED TO 3500 FOR 1-2 MINUTES. nO WATER PUMP NOISE, NO LEAKAGE, COOLANT LEVEL IS oK, ELEC FAN OPERATES...


Hello and welcome, it sounds like you need to replace your fan clutch. Your Jeep has 2 cooling fans 1 runs off the engine the other is electric. Before replacing the fan clutch you need to make sure the electric cooling fan is working just turn on your a/c and it should kick on. If it does then the problem is your fan clutch is it doesn't then your electric fan is most likely bad.

Jun 23, 2011 | 2005 Jeep Grand Cherokee

2 Answers

Running hotter than normal looks like it started leaking bad under motor now


There is well-established procedure for trouble shouting the over heating.
Does the car overheat in driving mode?
Yes.
Are you losing coolant?
No. Check water pump (including belt) and thermostat.
If yes make a radiator compression test. You might have a bad cylinder head gasket.
The car doesn’t overheat in driving mode, but overheat in idle.
Does the fan runs?
No.
Check the fan assembly for a bad motor, loose fan blades, or bad connector.
Check the codes for a bad temperature sensor.
Check cooling fan relay and fuse.
If this isn’t enough to solve problem, then send the car at dealer for a “check and advice”.

Aug 24, 2010 | 2002 Chevrolet Malibu

1 Answer

Overheats when idling. relay was replace and still overheats. fan runs when the a/c is on


When the engine heats up the fan should come on at this time. It is must be the relay or switch. There should be different relays for the AC fav and the cooling fan, even if its the same fan. If you have to you can wire it up directly, so when the ignition is turned on the fan will always run.

Aug 22, 2010 | 1998 Saturn SL

1 Answer

When idling my jeep overheats. The cooling fan is running and it speeds up when temperature goes up. The temperature gets close to 260 degrees and the engine tries to stall. when I start moving it cools...


At idling speed an engine does build up a lot of heat and the cooling fan will kick in. In slow moving traffic or traffic jams the temperature gauge can touch the red - particularly on hot days. The reason it cools down when you start moving is because of the air flow through the radiator.

Presumably there are no leaks from the cooling system otherwise you would have mentioned it. In normal circumstances the fan will not be running as you are driving at speed, as the air-flow through the radiator is sufficient to cool things. The fan only kicks in to get rid of excess heat - and this usually occurs at idling speed or after you have parked the car.

If the fan is running all the time as you drive, this points to either a fault in the fan switch, or the car is running too hot. presumably in normal driving the fan isn't running and the temperature gauge reads normal?

It is common - in stationary traffic many cars overheat (particularly big engined models) try to stall and 'cut out'. Restarting can be difficult until the engine cools down.

Is your car overheating in normal driving conditions or just at idle speed? Overheating in normal driving conditions can be caused by things like a failing water pump, blocked radiator, collapsed hose, faulty thermostat or, in the worst case scenario, cylinder head problems.

Overheating at idling speed is 'common'. Check your coolant level. If your car isn't using/losing coolant then there probably is no major problem. You can flush out the cooling system and refill with new coolant - and also check your radiator. Are the cooling fins crumbling with age? Or maybe they're partly clogged with insects and debris from the road? A blast with a hosepipe wil sort that out ..

The question is how much does your car overheat in normal driving? If it doesn't .. it appears as though you have nothing to worry about as such. Most cars have 2 speed fans... the 2nd faster stage kicks in at some point dependant on engine temperature. Perfectly normal.

Aug 14, 2010 | 2003 Jeep Grand Cherokee

1 Answer

Fans will not turn on therefore cause vehicle to overheat


cooling fan will not come on until about 230 degrees, if fans still do not work. check the fuses and relay. if ok then run a wire to fan from battery.on fan side connection, run a wire from battery positive to fan connection. run a wire from negative to ground connection.if fan will not come on it is either bad or the coolant temp, sensor is bad. because this sensor send info to pcm from various running conditions. it is very important that this sensor works. it can cause;
  • Extended crank time when the engine is cold
  • Poor fuel economy
  • Spark knock
  • Lack of engine power
  • Erratic and/or high idle
  • Engine cooling fan stays running all the time
  • Engine cooling fan fails to turn on
  • Engine overheating
  • Jun 20, 2010 | 1996 Nissan Sentra

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    Engine overheats when stopped


    Is the cooling fan running when it overheats?

    May 04, 2010 | 1995 Ford Escort

    1 Answer

    My 1997 Sebring overheats while in idle but


    does it overheat going down the road if not check to see if radiator fan(s) is running when it heats up at idle car needs fan to run cool at idle but not while going down road

    Feb 17, 2010 | 1997 Chrysler Sebring

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    Cooling fan runs constantly. Car overheats.


    check engine temp sensor if ok check fan relay

    Jul 07, 2009 | 1998 Cadillac Eldorado

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