so i went outside just 25 minutes ago at 11pm-ish and added coolant. i poured the whole yellow gallon (i bought it earlier today new) into the radiator and there was nothing leaking from the bottom of the car nor the top. i did hear the coolant going somewhere as i poured it in. i could not see any coolant in the radiator so i'm guessing it was not filled enough. i also poured some coolant into the reservoir tank earlier and it was completely emptied after i started the car.

with the car on and radiator cap off, i didn't see any bubbling at all. i checked the back of the car and there were no white smokes or any smokes coming out. i revved the engine and still no smokes or bubbling. i put the cap on and drove it around for 10 minutes. there were no overheating, but the buzzer comes on. my thermostat stays around middle. sometimes when i shift into 1st or 2nd gear and gas it or make a turn, the buzzer goes away but it'll come back.

i did find out that my oil filter was not twisted tight; i had a shop changed my oil on monday to castrol gtx 20w50.

what else can i do? my car was over heating earlier today and i replaced the upper radiator hose because there was a tiny hole spraying fluid.

 

I would make sure the thermostat is not stuck Not likely But If you just baught it maybe the past owner knows something you dont? Did it ever run cool? Do a system coolent pressure test. make sure its not the coolent Seals. If it has an electric Fan make sure that is working

 

That buzzer also warns of low oil level...have you checked that?

 

Hello,

I know this issue, a friend has the same with his S5 T2, oem radiator and electric fans. Car does overheat if you pass a bus on the highway like nobody else s business. Fresh rebuild running initially without thermostat and undertray plus efans. Something I dont consider a wise idea, but who am I telling that At least the thermostat is fixed right now and its a bit better but stil far away from good.

Your issue sounds very similar. If I were to put an educated guess I would say that the car is running at its limit of cooling capacity. Common causes, bad coolant, not enough coolant, too much dirt and debris in the system, radiator too small, no thermostat, no undertray, bad fan (not pulling enough air) or just a mix of them. I guess its a T2, well either way the FC has bad airflow to the radiators if you ask me. Lower third is only exposed to airflow and this there is most likely also an ac radiator in front plus the oil cooler and the usual stuff like horns and cabling and whatever. Just sit once infront of the bumper and look at the path air has to travel and then you understand The old viscos they do pull pretty strong, never had a problem with them but efans dont work immediatly out of the box as good you might want. There is more to it than just bolting them in.
So yes the bad airflow will reduce cooling capacity to the point that the car is overheating. I messed around enough time with FCs cooling systems that I almost cant hear it anymore

Steven

 

https://www.rx7club.com/2nd-generati...thread-928512/

 

/\This.
and the buzzer is for both low oil and coolant.
Did you Check the oil level.
and also did you burp the cooling system,it could have air after you "went Dry".
Keep track of your fluids my friend,I have the feeling you are going to post a "I need a rebuild" soon.

 

sounds like a small air pocket in the cooling system still. let the car cool off and top off the coolant level again until the buzzer stays off. this may take a few days/driving trips.

nothing else you said points towards any other cooling system issues. of course it was going to initially overheat, it was a gallon low on coolant..

 

hmmm.... where did the original coolant go?

EDIT: whoops... nevermind. didn't see the part about the radiator hose.

 

on monday of this week, i took my car in for an oil change at a shop that i normally go to. i went in with a 5 quartz jug of castrol gtx 20w50, therefore i can't be low on coolant.

this is a 1990 gxl. my front bumper already has a cut out for air flow. i'll need to order a new oem thermostat from what i read in the other threads. I have another gallon of coolant so I'll pour it in again.

i also made a topic about the idiot light not lighting up. shouldn't the Add Coolant light up? Because it didn't light up, but I definitely needed coolant at the time.

 

That's oil and not coolant.

 

oops typo

 

i think i was just low on coolant. i added another gallon and i can see the coolant at the top of the radiator. i had the car on without the cap in placed and there weren't any bubbles, which is a relief. i even revved it and still no bubbles.

i think what happened was that the buzzer went off yesterday to notified me of low coolant. i added a gallon of coolant and i noticed that i put the cap on in a different way/position than before. went back to work; no buzzer. got off and almost home, decided to make a stop for snacks and i heard steamy sounds coming from engine bay. turns out there's a weep hole on the upper hose. drove the 3 minutes home and got the car off. replaced the hose, but didn't top any more coolant into the system. buzzer goes off and temp rises. turned the car off and let it rest. at night, i poured the remaining coolant that i bought earlier into the radiator. drove around for 15 minutes. no rising temperature, but there were buzzing. this morning, i added another gallon of coolant into the radiator and even watched for bubbles. there weren't any bubbles (whew!), no rising temperatures, no buzzing.

i will give an update soon after i drive the car to school and back home. i hope it was just lack of coolant.

 

my buzzer still going off. i took it for a test drive down to autozone and back. on the way there, there weren't any buzzing, but on the way back it was buzzing. my upper radiator hose is hot. should it be hot? my temp gauge is reading where it should be, about mid.

 

let it cool off and check the coolant level again, if you're still adding much more than a few cups of coolant then it is going somewhere.

 

You're adding a mixture of coolant and water, and not just 100% coolant, right?

 

I Had a really slow leak 2 engines ago and I could never find the leak. Only when that engines popped and I removed the flywheel did I realize it was a freezeplug.

 

And get one of these:


No more air bubbles

 

i'm using the prestone 50/50 coolant

pic:

 

Doesn't the oil system hold 6 quarts?

Keep checking your coolant level.

 

While you've been doing all this coolant adding your heater core has been open (temp set to HOT), right?

 

i added my coolant with the logicon on a/c and settings on off. i need a recharge on my a/c anyways.

i bought 2 hose clamp from autozone and replaced the old hose clamp that i had on the upper radiator hose, and i also added some coolant. i left my car on for over 20 minutes in my driveway and constantly checking the temperature gauge every few minutes. the meter did not rise and stays a little below middle. i then took the car for a long drive around town via local way. i then took it on the freeway and was stuck in traffic. i made a drive-thru stop at carl's jr and had to wait over 5 minutes for my order. got home and touched the hood of my car. it's not really hot. the temperature gauge never rose beyond the middle point throughout my drive. there were no buzzing throughout the whole time. i think i am all good now!

 

That's weird, the AC has nothing to do with the cooling loop.
You want the heater core open to the flow, key ON and set temp to HOT (this opens the water control valve fully, you can then key OFF).
Now run the engine up to temp, let it cool and check the level.

The heater core is a giant air trap if you don't flush it out.