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I got a 86 CRX-HF that is running hot but not really overheating. It's running at about 60-90% of the temp gauge. When I start it and warm it to operating temperature the fan will come on for a split second but then it immediately cuts off. I jumper wired the fan to the battery and it runs fine uninterrupted. The fan must be operating at least some of the time cause I can drive on the highway and up grades without it overheating - it just runs very hot. What could be the problem here?
 

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I would 1st check the radiator coolant level.(never open cap when hot, i'm sure you know that). Make sure its full to the neck.(use honda 50/50 mix,$7)do not use water! How old is your thermostat? Maybe it's not oppening all the way. Also, maybe your fans are working fine, but your fan switch is going bad(its located on the thermostat housing). Sounds like its low on fluid,tho.
If U end up replacing the coolant I would recommend "Red Line"-WaterWetter($14)and a high pressure radiator cap($25-$35).
 

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F23RA said:
I would 1st check the radiator coolant level.(never open cap when hot, i'm sure you know that). Make sure its full to the neck.(use honda 50/50 mix,$7)do not use water! How old is your thermostat? Maybe it's not oppening all the way. Also, maybe your fans are working fine, but your fan switch is going bad(its located on the thermostat housing). Sounds like its low on fluid,tho.
If U end up replacing the coolant I would recommend "Red Line"-WaterWetter($14)and a high pressure radiator cap($25-$35).

And why wouldn't he use water???? Water is what actually cools the engine. A cooling system with 100% water will run cooler than a cooling system mixed with a mixture of antifreeze and water.

Do not use Water Wetter. Water wetter would just be a bandaid for a bigger problem (ie fan not working, bad water pump, etc). Water wetter is meant for higher performance engines.

I wouldn't rely too much on your factory electric water gauge. Electric water gauges are known to be inaccurate with age. Personally I would buy a mechanical water temp gauge ($14) and run that from now on. If your engine is truly running hot then make sure you have coolant flow (water pump working), then trouble shoot from there. If your fan is not running while idling in traffic then it could be the relay.
 

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spray004 said:
And why wouldn't he use water???? Water is what actually cools the engine. A cooling system with 100% water will run cooler than a cooling system mixed with a mixture of antifreeze and water.
W/out getting too technical, water tends to Dissipate/evaporate :confused . U are right, an engine w/water would run cooler Vs. engine w/ coolant(if U were racing in the 1/4 mile) however, in everyday stopNgo traffic you would most likely overheat(unless you refill your radiator w/ water every 15 minutes! :bash ) Water also doesn't lubricate the seals in the water pump which can rust,crack and we all know what happens after that. if the fans don't work it can be a relay(U right again)...or a blown fuse or a bad fan switch. If U don't like REDLINE products(which are great), then do not use them.They are not for everybody. they work for me tho. I have various Spoon Sports products under the hood of my car that help keep temps. under control along w/ Royal Purple Ice(similar to redline's W/W) for over a year now and they work great together(for me at least=Faster warm ups,better fuel economy & performance)Oh and a $14 gauge??, uhm, I wouldn't skimp out on a gauge that provides important info about my engine!
 

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spray004 said:
Do not use Water Wetter. Water wetter would just be a bandaid for a bigger problem (ie fan not working, bad water pump, etc). Water wetter is meant for higher performance engines.
Did U not read what macrob68 wrote in his post?
it was mentioned in there that THE FANS COME ON FOR A SPLIT second and IMMEDIATELY CUT OFF. I think red line W/W can be considered what you would call a "bandaid" for this kinda "problem".(read your post). and isn't this a Honda Performance Forum? That is why I mentioned Redline W/W(read your post)
 

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spray004 said:
Do not use Water Wetter. Water wetter would just be a bandaid for a bigger problem (ie fan not working, bad water pump, etc). Water wetter is meant for higher performance engines.
Did U not read what macrob68 wrote in his post?
it was mentioned in there that THE FANS COME ON FOR A SPLIT second and IMMEDIATELY CUT OFF. I think red line W/W can be considered what you would call a "bandaid" for this kinda "problem".(read your post). and isn't this a Honda Performance Forum? That is why I mentioned Redline W/W(read your post) :byye
 

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F23RA said:
W/out getting too technical, water tends to Dissipate/evaporate :confused . U are right, an engine w/water would run cooler Vs. engine w/ coolant(if U were racing in the 1/4 mile) however, in everyday stopNgo traffic you would most likely overheat(unless you refill your radiator w/ water every 15 minutes! :bash ) Water also doesn't lubricate the seals in the water pump which can rust,crack and we all know what happens after that. if the fans don't work it can be a relay(U right again)...or a blown fuse or a bad fan switch. If U don't like REDLINE products(which are great), then do not use them.They are not for everybody. they work for me tho. I have various Spoon Sports products under the hood of my car that help keep temps. under control along w/ Royal Purple Ice(similar to redline's W/W) for over a year now and they work great together(for me at least=Faster warm ups,better fuel economy & performance)Oh and a $14 gauge??, uhm, I wouldn't skimp out on a gauge that provides important info about my engine!
Water is what actually cools an engine, antifreeze coolant does not. Water does evaporate when given a path to escape. Unless you have a hole in your cooling system or a worn out radiator cap then the water will not escape the cooling system.

I never said I didn't like redline products, I was saying that using water wetter is a waste for anything but race application or extreme high performance engines. If you really want lower operating temps then just install a lower degree thermostat, get larger fans or a bigger radiator. Fuel injected engines require warming operating temperatures to operate efficiently. Also if you run an engine too cool then your oil temp will not be high enough to give you maximum performance as well. Using water wetter or any other similar product in this case would just be putting a bandaid on the problem and ignoring the root cause of the overheating.

A mechanical water temp gauge is not a complex item. You can buy an Autometer gauge for dirt cheap and have more reliable information than a factory Honda temp gauge or any other electric water temp gauge.


I have various Spoon Sports products under the hood of my car that help keep temps. under control
Please don't tell me you wasted $80 or however much a Spoon thermostat costs...... :lol2
 

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pricey: YES./a waste:NO

spray004 said:
Please don't tell me you wasted $80 or however much a Spoon thermostat costs...... :lol2
I know U can get a low temp.thermostat @ kragen auto parts for bout $12-$14 (which fits right in your budget :hehe ) But,Spoon is a well respected company.They are know for technical superiority & superb craftmanship.They are race proven & dyno tested.The thermostat uses a flow-control-type valve that prevents hunting, therby achieving rapid stabilization of the water temperature.example:the engine warms up w/in a short period of time & U get better gas mileage.Also it prevents engine powerloss by minimizing rapid water temperature rises under spirited/harsh driving.Also,it opens @ 65deg.C and is fully open @ 70deg.C. So it stills runs warm,not cold at all like U thought. It's not like U get 50hp from this but, you do see the difference. W/ the oem thermo.I was spending $48 on gasoline/5days.Then $80 on gas/5 days w/old,worn thermo.When i switched to the Spoon thermo.I was spending $32-$35/7 days!!So U can now see how (I) greatly benefit from this mod.this was driving just to work N back.Again,I Don't think that Spoon thermostat was a waste.
 

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F23RA said:
W/out getting too technical, water tends to Dissipate/evaporate :confused . U are right, an engine w/water would run cooler Vs. engine w/ coolant(if U were racing in the 1/4 mile) however, in everyday stopNgo traffic you would most likely overheat(unless you refill your radiator w/ water every 15 minutes! :bash ) Water also doesn't lubricate the seals in the water pump which can rust,crack and we all know what happens after that. if the fans don't work it can be a relay(U right again)...or a blown fuse or a bad fan switch. If U don't like REDLINE products(which are great), then do not use them.They are not for everybody. they work for me tho. I have various Spoon Sports products under the hood of my car that help keep temps. under control along w/ Royal Purple Ice(similar to redline's W/W) for over a year now and they work great together(for me at least=Faster warm ups,better fuel economy & performance)Oh and a $14 gauge??, uhm, I wouldn't skimp out on a gauge that provides important info about my engine!
ahahahh...I guess my cooling system is magic because during the summer I run 100% pure water in my car, In the winter it gets changed to a heavier antifreeze/water mixture.
 

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thats great for U,man.I know it works,But I had overheating problems in other cars (2ford mustangs,1991&1994,escort,a 1968cadillac and a 1972camaro).that were running just water during summer(my heating system wasn't magical). two were not even running a thermostat....guess my engine was thirsty.
 
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