haha, thx?

Check and make sure your radiator fans are coming on. Spend some time with it, and watch for the fans to come on when the car is idling for awhile. Usually if it starts to get hot at idle, but cools when driving, it's a flow problem. Either air flow or coolant flow.

Mario A. Guzman jhjj

thanks

One of the switches turns on the fans, but I don't remember which one. I want to say it's the one to the left of the distributor, but it's been awhile. The other possibilities are of course the fans don't work or there's a wiring problem. But if you take a paper clip to the fan switch/temp switch...the one that turns the fans on. Disconnect the connector and jump the two pins from the wire harness. If the fans come on, then you know everything else is working, and the switch is likely bad

You should check to see that both fans are working on the radiator. That's a common failure

Sounds more like a flow issue. I would suspect radiator fan or water pump. Radiator fan is easier to check. Also make sure coolant is full

+Matt J. DeLand 10 or 12mm. I cant remember it's been so long. Usually 10mm though

Yeah, its a 10mm. I just did mine. Your video helped. Thanks.

+Matt J. DeLand Sure. Thanks for watching

It'e pretty normal for a car that is overheating to run cooler with the heater on. That's not a symptom of what's wrong with your car. Lots of things could be wrong. Are the cooling fans working, is it low on coolant, is the radiator clogged, water pump working, blown head gasket? These are the things you need to verify to figure out what's causing the overheat.

im having this exact problem, did you end up finding out what was wrong?

@@slowdosee yea i had 5 holes in my radiator so it wasnt holding any pressure. The second i replaced my radiator i never had an issue ever again

Usually a blown head gasket will cause overheating at high RPMs. When the engine is cold, check the coolant for signs of engine oil or gas odor, and check the oil for signs of coolant.

JamesonDIY thanks 👍 i checked the coolant but theres no sign of oil or gas odor, also the engine oil no coolant mixed. is it my head gasket slighty blown?? or totally blown??

It's possible. It should be checked for hydrocarbons using something like an engine block tester. All the other basics should be checked as well. Cooling fans operating, water pump, thermostat stuck, radiator blocked, etc

JamesonDIY ok thanks 👍 but i dont have an engine block tester. checked the radiator and no water coming out, flow of water is good as well as the fins. i decided to replace the head gasket and will tell u the result ASAP 👍 cheers!!

is there a DIY engine block tester?? no special tools.

Overheating and transmission issues are the main non safe driving issues. If you feel like a wheel is going to fall off or your brakes are grinding, obviously that is unsafe. But if its just an idle issue, yeah drive it to the shop

JamesonDIY Yeah, I should be fine. Thanks man!

sure, np. good luck

Mark C thanks for the heads up

Mark C welp fucckkkk

Have you verified the cooling fans are working? Also, who did the head gasket? A shop or friend? Was the head machined when the gasket was replaced? Is there anything blocking air flow in front of the radiator? With everything else replaced, I would verify those things first, as well make sure the cooling system is bled properly, and there is no leaks. The heater should work normally at idle once the engine is warmed up. If not, then likely cooling system has air in it, and needs to bled, and leak checked. But you didn't mention the fans, so make sure both fans are working and will turn on when the engine is warmed up. Let me know what you find. Thx

Yes. I failed to mention I replaced the radiator fan motor and both fans are working properly. Also, the head was machined before being reinstalled. Nothing is blocking the air flow in front of the radiator. There are no leaks. Also, the water pump was replaced. And yes, a friend replaced the head gasket...with that said, there is no water vapor leaving the exhaust.

I don't doubt your friends skills, but It sounds like you've covered all the other bases. It might be worth doing a block test at the radiator to verify there are no hydrocarbons in the cooling system. As well as make sure there is no coolant in the oil or oil in the coolant. The only other thing I can say to check is coolant flow. Could there be a blockage somewhere? Maybe in the heater core or otherwise? If the head gasket was bad before, there could be all sort of goop built up, that if not flushed could decrease coolant flow. Also some head gaskets can be installed backwards, which usually means coolant passages get blocked. You never mentioned when it overheats. That's an important part of diag. Only at idle, only while under load, only with AC off, etc??

It wont overheat in idle but only takes a couple of minutes driving down the road at 30-40 mph for it to do so.

Had a pressure test done. It turned out a cylinder was cracked so I bought a 2014 Toyota Corolla. I'm done with the head scratching and throwing away money. Thanks for your help tho. Subscribed

+Roque Agasid No, but it could cause your gauge to not work correctly. Some cars, like this honda, will have a radiator fan switch. It looks just like a temp sensor, but it turns the radiator fan on when it gets to a certain temp. If that goes bad then you will experience overheating, because the fan will not come on.

+AppalachianDIY how do u know if waterpump is bad?

+Roque Agasid Well if it's leaking from the weep hole, it is worn out and should be replaced. If it's not leaking, it's a bit more tricky. If you can get to the water pump easily, you can remove the belt and wiggle the water pump pulley. If there is any play in the water pump pulley, it's bad. If you cant get to the water pump, then you need to make an educated guess. Sometimes if the water pump is weak, you may notice the heater doesn't work well, or it only works when you're driving, but not at idle. However, a blown head gasket, or air in the cooling system can cause this too. Another thing to look for is, once the engine is completely warmed up, feel the upper and lower radiator hoses. If the lower hose is significantly colder than the upper, the water pump could be weak, and not efficiently moving coolant through the system. Be careful though, a stuck closed thermostat, or clogged radiator will show similar symptoms. Hopefully that helps. The water pump is tricky, but it will usually leak from the weep hole when it's time to replace it. Go through all the steps for overheat diag: Verify coolant level good, and no leaks, and NO AIR in the system. Make sure fans working Make sure thermostat is opening, and flow through system is not blocked. Make sure front of radiator is not blocked with debris, and cooling fins are OK. Check for hydrocarbons in the cooling system, or do leak down test, to check for blown head gasket

@@AppalachianDIY u mean doing a compression test will determine if a head gasket is blown ?

home depot

JamesonDIY do you know the bolt code or how I can tell which one to buy

they have those bolt thread measuring tools at O'Reilly Auto Parts. Just take one of the other ones with you, and measure it, then buy one like it.

JamesonDIY ok thanks

When the AC is on both fans should be on. Im not sure if they both come when the AC is not on, without looking at a wiring diagram. So check that first. If you keep driving it with only one fan you could blow the head gasket, if it's not already blown

JamesonDIY only the radiator fan turns on when it starts to over heat

It probably is working. Likely the slight over heating is caused by something else. With the thermostat removed, it sounds like it is offsetting that slight over heating. Make sure cooling fans are working. Check for leaks, check that there's no oily residue in radiator (head gasket problem). Check for coolant flow (if your heater works normally, coolant flow probably ok)

engine is 30k just swapped, all parts are brand new, hoses sensors etc.. seems 2 thermostats have been bad yet good, they work out of the car just not in it hahaha flow is good I have no problem un bolting a hose and shit poors right out nothing clogged, heater core also flushed, could it be the cheap ass Oreillys thermostat? Need to buy OEM

Anything is possible

The engine wont heat up as quickly, so it may use a little more gas than normal. The heater won't get warm as fast. But if it's already overheating badly, it may make no difference at all. But, no it doesn't really "hurt" anything

JamesonDIY so its like hard to heat up and if the engine is in high temp, hard to cool down????

no, with the thermostat out, it takes longer to heat up. It will not make it hard to cool down

JamesonDIY 👍 thanks!! appreciate your reps.

+Artek Balbawang - It's called a Thermostat By-Pass .... I have Vid in my Channel if you are worry .... James is 100% correct, it won't hurt anything, it actually HELP YOU MORE :))))). I did a TEST on Before and After..... check it out in my Channel or ask here... :D

It may or may not be, but you are obviously losing coolant. So you need to figure out where you are losing coolant and address that

Yeah ok thanks i dont if its the water pump or it might have a blockage somewhere with the pipes idk but when i top the radiator Reserve tank its going down after i fill it up

It could be air in the system, or it could be a blown head gasket. Your description is kind of vague. Is it overheating? Does it reach operating temp before the coolant starts to bubble over? It's hard to say from your description. Maybe some more info, I could help you out more.

AppalachianDIY Hey the previous owner changed the headgasket, waterpump radiator, what I meant, was that the coolant goes to the point that it bubles from i suppose getting hot, although the temp guage stays on just below the center, i dont know what else can be, thanks

Could be head gasket. Check for coolant in the oil, or oil in the coolant. Check for swollen radiator hoses. These are signs of blown head gaskets. Could also be bad water pump, but usually that will show different symptoms (such as leaking, or noise)

JamesonDIY thank for answering, everything looks good but the upper radiator hose is swollen it's not a genuine one , when i changed the timing belt the the mechanic said your water pump is good no worries ..any suggestions dude ?

If the upper hose is really soft and swollen, and there is a oily film inside it...Also if you can see an oily film in the radiator overflow reservoir, there is a good chance the head gasket is blown. Did you verify your cooling fans are working?

JamesonDIY yes bro cooling fan tested and works fine ..sadly after a long research on forums I've found this : Re: Civic 02 strange Overheating Not to bump an old thread but I can confirm this is a head gasket issue. It's pretty common in this car. I was annoyed at this problem for months and months. Time finally came to replace the timing belt, which during this time the head was checked and machined. The problem has disappeared from the time this was done over 3 years ago. I could never completely bleed my cooling system. I thought I had all the air out and would let it idle for 10 more minutes, then as soon as I rev'd the engine, the water pump would force the combustion gases past the thermostat and I could smell and see them coming out of the radiator. Most cases you probably won't find coolant in the cylinders or anti-freeze in the oil, etc. They are failing in just the right area to allow the pressure from combustion to enter the cooling system at a low rate. I was constantly draining the reservoir and putting the coolant back into the radiator, only to have it pushed back out a couple weeks later.

Yeah, I have replace on a lot of head gaskets on Honda engines. It's usually obvious with the upper radiator hose. You can confirm with block tester (sometimes). But an experienced Honda tech will be able to tell pretty easily. Some times BluDevil Head gasket sealer will help with small head gasket leaks, but even if it helps, it's only a band aid and will eventually need to be fixed the right way.

The needle does what? It's overheating? Overheating can be caused by other thing besides water pump and thermostat failure.

Yes, they were working

Okay, thanx for the reply.

My radiator fan doesn't turn on so is this problem just my fan or thermostat too?

It is unlikely that turning the AC on causes the overheat. Especially cars with electric cooling fans, since they are turned on when the AC is switched on. But check the fans to make sure they are working properly. If it is not an electric cooling fan, check the fan clutch to make sure it has the proper resistance, and is not just free spinning. And the most overlooked thing: Check to make sure the front of the radiator and condenser is not blocked with leaves or some other debris.

the AC fan isn't coming on when it is supposed to

Im sure it was aftermarket

Thanks Man... trying not to overthink it...But I'm struggling with this Big time!!! so many say use nothing but OEM! But i'm leaning towards aftermarket Stant superstat!

+obxguy1 - You can use OEM or ANY... NOTE: AS LONG AS IT HAS..., a " Burp " hole... Or " Fail Safe " hole.... Some CHEAP stuff won't :((((( I will make a Video soon on that one, so you guys will know what they are... It took me a long time to find that one out :(((((... I will share my finding soon in a Video.... I am making it right now, just need to Edit and Upload :)))

Fans working?