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#1
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When does the cooling fan come on?
Surprisingly, I'm having trouble getting an answer to what seems to me like a simple question. I have a '97 Accord, which is running very hot. What I've noticed is that if I'm stopped (with the temperate gauge nearly in the red zone), the fan does NOT come on if the engine is running. If I turn the engine off, the fan comes on immediately. If I turn the engine back on, the fan goes off. Is this normnal? In other words: If the engine is hot enough to require the fan when the engine is OFF, is it normal that the fan will not come on when I'm stopped at the engine in ON? Many thanks. -Joel Hoffman |
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#2
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The fan relay is temperature controlled and will normally come on when
a specific temperature is achieved. The sensor is close to your t-state flange. you can trace the wiring back from the fan to the sensor. Once it comes on it stays on until the sensor drops to the low end of about a twenty degree F range. It is possible for the temperature to spike when you stop the engine becausethe water pump stops circulation immediately. This spike could cause the fan to come on. However if you are getting close to the red zone with the motor running it should be coming on before that. Air conditioned models have two fans. The one on the battery side is the radiator fan the other side is the AC condensor fan. Both work the same way with a temp sensor/relay. Have you felt the top radiator hose when the temperatur spikes? If it is not hot then you may have a sticking T-stat that is causing the spikes. You could have a bad sensor/relay and it is not turning on the fan at the right time. I'm not sure (don't have my manual with my right now) wether the sensor that turns the fan on is the same sensor that controls what you see on the gage. If it is it could be bad and you're not actually getting hot. But if you are you need to get it under control before you warp a head or blow a gasket. On Tue, 12 Jul 2005 15:32:06 GMT, (Dr. Joel M. Hoffman) wrote: > >Surprisingly, I'm having trouble getting an answer to what seems to me >like a simple question. I have a '97 Accord, which is running very >hot. What I've noticed is that if I'm stopped (with the temperate >gauge nearly in the red zone), the fan does NOT come on if the engine >is running. If I turn the engine off, the fan comes on immediately. >If I turn the engine back on, the fan goes off. Is this normnal? > >In other words: If the engine is hot enough to require the fan >when the engine is OFF, is it normal that the fan will not come on >when I'm stopped at the engine in ON? > >Many thanks. > >-Joel Hoffman |
#3
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Dr. Joel M. Hoffman wrote:
> Surprisingly, I'm having trouble getting an answer to what seems to me > like a simple question. I have a '97 Accord, which is running very > hot. What I've noticed is that if I'm stopped (with the temperate > gauge nearly in the red zone), the fan does NOT come on if the engine > is running. If I turn the engine off, the fan comes on immediately. > If I turn the engine back on, the fan goes off. Is this normnal? > > In other words: If the engine is hot enough to require the fan > when the engine is OFF, is it normal that the fan will not come on > when I'm stopped at the engine in ON? > > Many thanks. > > -Joel Hoffman No, the fan is supposed to go on when the engine gets hot. Get this fixed, because an overheating engine will eventually fail, sticking you with an expensive repair. I can't stress it enough: fix or get it fixed soon! Do both fans come on when you turn the AC on? I suspect they do because they come on after you've turned the car off. I think Accords have fan relays, so these are most likely fine if that is the case. If you have to drive the car with this condition (fans not running when they are supposed to), run the car only with the AC on so at least you are getting proper cooling. You obviously can't run the car forever like this, but it will get you around town to collect the parts you need or to a repair shop. If you're doing it yourself, I'd check the thermoswitch or the connection to the thermoswitch. With a multimeter set to volts, you should see approximately 12V across the switch if the car is cold. When in need of cooling, you will see zero volt across it. If you don't see 12V when cold, the wiring to this switch is most likely the culprit. If you don't see zero volts when in need of cooling, the switch probably has a bad ground or the switch is bad. Short the switch to see if the fan comes on. If the fan now turns on, your switch is bad. If not, report back. Tegger.com has a section on cooling that might be of use to you. Remco |
#4
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Dr. Joel M. Hoffman wrote:
> Surprisingly, I'm having trouble getting an answer to what seems to me > like a simple question. I have a '97 Accord, which is running very > hot. What I've noticed is that if I'm stopped (with the temperate > gauge nearly in the red zone), the fan does NOT come on if the engine > is running. If I turn the engine off, the fan comes on immediately. > If I turn the engine back on, the fan goes off. Is this normnal? > > In other words: If the engine is hot enough to require the fan > when the engine is OFF, is it normal that the fan will not come on > when I'm stopped at the engine in ON? > > Many thanks. > > -Joel Hoffman > hold on there cowboy: you've been told to test the sender/relay circuit how many times? you're getting free advice from people that know what they're doing. you otoh, don't seem to want to hear it. why are you bothering to waste your time if you don't want to take the advice you're not paying for? just pay to get the advice of a garage - if money changes hands, maybe you'll listen. |
#5
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The cooling fan should come on between 195 and 210F. typically.
Has the a/c harness recall been done to you car? If not I'd get that taken care of. "Dr. Joel M. Hoffman" wrote: > Surprisingly, I'm having trouble getting an answer to what seems to me > like a simple question. I have a '97 Accord, which is running very > hot. What I've noticed is that if I'm stopped (with the temperate > gauge nearly in the red zone), the fan does NOT come on if the engine > is running. If I turn the engine off, the fan comes on immediately. > If I turn the engine back on, the fan goes off. Is this normnal? > > In other words: If the engine is hot enough to require the fan > when the engine is OFF, is it normal that the fan will not come on > when I'm stopped at the engine in ON? > > Many thanks. > > -Joel Hoffman -- Tp, -------- __o ----- -\<. -------- __o --- ( )/ ( ) ---- -\<. -------------------- ( )/ ( ) ----------------------------------------- No Lawsuit Ever Fixed A Moron... |
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