cars overheating out of no where... just did a h22a swap like 21 weeks ago. Replaced the thermostat didn't fix the prob. fans are turning on. I had the same problem before the swap but ended up taking out the thermostat and it helped a bit. The coolant just doesn't seem to flow as fast as it should. Im thinking its the radiator because it happened on the other engine. and whats the possibilities it could be 2 water pumps... Let me know your opinion before i start this thanks..

 

Depending on what water pumps you bought its likely, even for the thermostat, some of the aftermarket water pumps I've seen were just total garbage right out of the box.

 

if the coolant isnt flowing then it has to be the water pump. what do you mean 2 water pumps though?

 

You should definitely go with honda thermo cause I had an autozone pos and it wouldn't open so replaced it and fixed the problem. With your water pump you should have DEFINITELY gone with honda that thing is too much of a pain in the *** to go the cheap way out.
flush your radiator and block replace pump and refill and bleed it properly and you should be set.

 

This is what happen i put a new radiator on today determined it was it. I put the new one in. drove about 5 miles, running it hard. I get back to my place and turn the ac on.. and it overheats.... from there on it seems to just overheat all the time... im guessing its the waterpump.. but im gunna run some more tests tom and see whats going on.. let me know what you guys think. Thanks. could it be ect sensor?

 

And btw i havnt even changed the thermostat in it. Its the stock one from buying it imported.

 

I seemed to have the same problem with my h23 before. it kept overheating till i took the thermostat out. but then it overheated maybe 1-2 times in a 3 month period.

 

Did you change the t-belt, water pump and oil seals in the timing area before putting this motor in the car?

 

I'd just replace the thermostat...cheapest part. :p

My understanding is that virtually all cars will not reach operating temperature without a thermostat...so, I wouldn't bother wasting my time trying to run it without it... even if your water pump was toast, it might not overheat without a thermostat.

 

No i didn't but all this is being done now... you'd never guess what it was... sorry it took so long been busy with work. it ended up being the water hose that goes behind the block. the o-ring that connects from that pipe to the thermostat housing. This o-ring is so hard to find..Dealer ship item... Getting it today hopefully its the right one cause other people said they had it but it was either to thick or completely off....

 

i have a stupid question...have you bled your coolant system?

 

how was that causing you to overheat?

 

Yah i did. and it was overheating cause it would leak out and id run out of coolant.. I never noticed a leak though beacuse it was burning off the engine before it hit the ground.. that's why i figured i had a bad water pump cause there was no presure in the system and i was loosing coolant. usually water pumps leak out coolant when they go bad..

 

ahhhh....let us know how it turns out

 

Okay this car hates me...replaced the radiator. o ring seals all around the thermostat housing and inside the housing. replaced the thermostat. and replaced the water pump along with the timing belt. And get what. still overheating. Im stumped. I drove it about 20 miles. really no problems. get home turn the car on 20 mins later and its overheating.... Im pretty sure i bleed it our right but im gunna try again tom. other then that sensors and hoses can only be left? unless its the radiator cap which ive been reading a lot of people change.. do they really effect anything? I NEED HELP! lol.

 

yes, the cap helps, but i doubt it's your problem unless the one you have is defective. i would only replace your stock cap if you're out running hard on the streets or you're on the track ever.

when your car starts overheating, does your fan turn on? i know you said it does, but are you sure? have you actually seen them turn on or just thought you heard them? is your car only overheating when sitting still or when you're driving at highway speeds, too? do you have only antifreeze in there, or do you have a mixture of water? if you have only antifreeze, you need to drain some of that coolant and add water. florida isn't a place you want only antifreeze for coolant.

if all of that is good to go, let's start at the beginning. 5 months ago you did your swap. no overheating, right? this just started about 10 days ago. have you checked your oil? i hope you haven't been so worried about your coolant system that you didn't pay attention to that. you need to remember what was different between 11 days ago and 10 days ago.

have you flushed your coolant system? you could have a clog in your heating core or whatever that thing is on the passenger side that gives you heat. do you get hot air when your car is warmed up? if not, i would definitely say that's your issue.

quit spending money on your car for parts that already work. find someone local that you can trust that knows cars and won't tell you he/she "thinks" that they know what is wrong. car problems suck, but spending money on working parts just to continue to have car problems is aggravating.

 

yah i know. only thing i bought i didnt need was radiator. rest wasnt done when i did the swap anyways. and mostly water if anything right now because ive been draining it so much to put new gaskets and orings on. yes hot hair has been blowing when the heaters on and cars warm. and yes fans do turn on when i turn ac button on. both fans. but actually last night when car was starting to overheat on way home i turned ac button on and only condenser fan was going. put paper clip in and jumped it then started up. ugh this is so frustrating.

 

you might have a blown head gasket or a small leak youve overlooked , check your fans fuse and make sure too purge any a out the system.

 

your radiator fan should turn on when your thermostat kicks

 

Okay where do you guys buy your thermostats? my fan dont kick in right dont think. apparently when its suppose to. also when i put the bleed hole open while running the car with radiator cap ON. either no coolant would come out or barley any would come out.

Guys im about to set this car on fire.

 

i feel ya on that...

if you aren't having anything come out, either you have a LOT of air in your system, or your system isn't under pressure.

i'm not sure who has thermostats for our cars. i would say any auto parts store, but i wouldn't be surprised if they didn't carry it.

 

UUPDATE!!!

Brought to to a friend of mine mechanic.. took out thermostat and it worked okay on the way there didn't overheat actually stayed below most the way there. noticed after that that the fans just didn't seem to click on without me making it turn on ( pushing on the ac botton). so we made a relay and fan turns on when car turns on. then it still overheated! so he took his temp gun thing that reads the temp inside the engine and it says it was 135 deg! which is 35 below what thermostat opens at! So ive been driving it still and it does it very little. when it does i pull over.. take off cap and then drive. im thinking there could still be a little air in it. we will see.. i wanna put the thermostat in it though because i want it running with parts it should have in it... and 1gplus i have 2 brand new thermostats. a failsafe and a cheap one...

 

sounds like it's not your thermostat, though. i wouldn't be shocked if you have air or a clog in your system.

 

Yah that does sound reasonable. clogs must be hard to get out? so im gunna check some stuff now then go put the thermostat back in and bleed it out.

 

when your car starts overheating, shut it off and go feel the return hose to your radiator. if it's hot(be careful), you don't have a clog.