EGcivic_95

hello H-T. i have a 94 civic with a b18b1 and it is over heating slightly so before it gets to hot i shut it off. i also noticed my heater went cold so i lost coolant. well i did its every where uner my hood and this is the second time so far and i am stuck i dont know how its overheating or throwing anti-freeze all over. i looked for a hole in my hoses and so far i dont see any. and same with the radiator. so guys im asking if some one knows or can help please get back to me thank you very much.

sneeb

check your thermostat

EGcivic_95

yeah luckily i just bought one lol, but if i let the car sit after i was driving it overheats, but if i drive it constantly it wont over heat. waterpump? thermostat? idk please lit me know.

sneeb

radiator cooling fan is probably not coming on

mienboiracer209

warm up the car until normal operating temperature and feel the bottom radiator hose, if it's cold, it means your thermostat isn't opening

EGcivic_95

yeah this maybe my issue, i noticed this when i left my car on checking for any signs and my fan didnt come on, but not sure if it didnt come on in that time frame but i could be wrong and ill check the fan tomorrow

EGcivic_95

oka ill do this tomorrow and let you know what happens

EGcivic_95

okay, well i found one problem so far. when the car is warmed up and the hoses have pressure and i squeeze the top one i can see about 6-8 pin holes that coolants screams out of. now the bottom hose was still cold as well, so lets say i had a fine thermo, and fine fan would these pin holes make my car over heat when im sitting but when i drive continuous it stay cool? or would this be thermo or fan? let me know

EGcivic_95

any one?

Jockone

As soon as you build pressure in the cooling system the coolant will start to leak out of the pinholes in the hose,when coolant starts to get low your car will start to overheat.

You have found one problem so fix it and see what happens,for all it costs might as well replace the thermostat while replacing the hose.

EGcivic_95

i already replaced the thermo just waiting till tomorrow to change it.

mienboiracer209

I'm pretty sure the culprit of your problem was the thermostat because you said the bottom hose was still cold when the top was hot. but it's a good idea to change the hoses (since those pinholes can burst when there's too much pressure) too, since you're already changing the thermostat.

sneeb

Holes in your radiator hose? You should fix that before we begin to try to diagnose what's going on here.

EGcivic_95

oooo im sorry guys i wrote that wrong when i ment pin holes i didnt mean they were coming from the hose they came from the rad. also i changed my thermo and the lower rad hose is still cold? when the car is at normal operating temp. and idea?

91efbluehatch

get a new radiator, change either your cooling fan relay, or the actual fan itself.

EGcivic_95

yeah i just got a rad and fan ill try that and let everyone know. but my question is, is why is my lower rad hose still cold even if i drive for a while andi changed the thermo?.

00siboy

iTrader: (3)

get it pressure-tested to see if there are any obvious leaks, then start looking at internal problems. as far as hot and cold hoses, any engine that has the thermo located on the lower hose is going to take a while to open. since it looks like you found leaks in the radiator, i would suggest replacing that first, your thermo probly has nothing to do with the overheating if u are losing coolant. just my suggestions, give me feedback if need be.

EGcivic_95

well ill change the rad and fan and see what happens first. i did get the new rad tested its fine, so ill keep every one updated.

EGcivic_95

okay i changed the rad and fan seems to be good for now. ill have to drive it to the store and back and let it idle to see if she overheats again and if not well thank you all for helping me troubleshoot my problem.

andyz

bleed the cooling system. air bubbles can cause all sorts of weirdness, hot or cold hoses, hot or cold heat.

Make sure to turn the heat on full blast when bleeding to get air out of heater core too.

EGcivic_95

yeah i would but my bleeder valve is like locked lol i cant brake it loose but ill get it loose (try) and bleed it i was going to but i began to freeze quick lol.

00siboy

iTrader: (3)

^^yep. what he said. also try revving it at idle to get coolant/air bubbles circulated

andyz

You don't have to use the bleeder. Just drive it a while, don't let it overheat of course, and then let it cool overnight. When it's dead cold, open the radiator cap and top it off. Keep the reservoir tank full too. If you do this a couple of times it should clear most of the air. Enough anyway.

If you do use the bleeder, get a piece of 3/16 vinyl hose and hook it to the bleeder and feed it back into the reservoir tank. Then rev it until bubbles stop coming out.

EGcivic_95

well my cars needle for the heat guage moved up after i drove and let it idle but it didnt climb high. i checked my hoses and they seem pretty pressurized maybe to much pressure? but i dont think my fan is coming on i know the fan works so what do i need the change sensor wise?

00siboy

iTrader: (3)

check continuity to your fan. if none, then replace fan