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Old 11-11-2006, 09:24 AM   #1 (permalink)
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Default Coolant not circulating

My coolant hasn't been circulating in my 92 d15b7. I recently changed my head gasket because of oil in the over flow bottle and a slow loss of coolant. I also replaced the thermostat at the same time as the hg. I changed my timing belt and water pump this past spring. I noticed that the lower coolant hose doesn't heat up unless I let it idle for at least 20 minutes. Only after the fan turns on. The temperature gauge doesn't raise above half way. I have flushed the radiator once and noticed that It was pretty dirty. Right now I am waiting for my car to cool off so I can drain the coolant again this time from the engine drains aswell. I am not sure what else I should do.
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Old 11-11-2006, 09:28 AM   #2 (permalink)
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my temp gauge never goes over, 1/4 even on 115 degree day in traffic.....hrm
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Old 11-11-2006, 10:19 AM   #3 (permalink)
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How do the stock temperature gauges correspond to actual temp.
(eg. 1/4=170, 1/2=190, 3/4=220 ?) I'm not saying this is correct, just an example. Also which way does the coolant flow lower hose to upper hose or upper hose to lower hose. I am just nervous that my coolant is blocked b/c of air or debris in system.
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Old 11-11-2006, 10:24 AM   #4 (permalink)
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Good point Low-EG. My temp gauge seems normal. I'm worried b/c of not circulating, the sensor isn't reading all the coolant just where some is.
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Old 11-11-2006, 10:56 AM   #5 (permalink)
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when you refill are you opening the bleeder on the head to let all the air out? What I do with mine is fill it up til the coolant comes out with no bubbles or anything, then tighten the bleeder. Then let it warm up with the cap off to bubble out any air. Let it run until the fan kicks on twice, mine takes around 15-20 min or so to do it too. check the coolant level in the radiator and fill the coolant in the reservoir to the max line and put it all back together. If there is air in the line, you should be running hot when it hits the air pocket. You may already be doing all this, just wanted to make sure
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Old 11-11-2006, 12:01 PM   #6 (permalink)
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I have the same problem with 93 civic. My lower rad hose seems to always be cool compared to my upper hose. My car also takes forever to warm up, needle stays under the C; until I start running the car for about 5 minutes.

I just changed my rad and thermostat too.
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Old 11-11-2006, 12:12 PM   #7 (permalink)
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mine stays cool running too...but as far as circulating coolant...thermostat could be in wrong...where was the little pinhole when you put the new thermostat in?? I've never had mine apart, so I don't know if its possible to put them in backwards, but I DO know its possible in my b20...water pump is cheap on them too, affordable enough to replace if in doubt...
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Old 11-11-2006, 06:31 PM   #8 (permalink)
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OK I just flushed my coolant with cleaner. I took out my thermostat and ran it for a few minutes so it would flush better. I noticed some old head gasket and metal flakes. I'm glad I cleaned it out but I don't think any cooling ports were clogged because of the small amount of junk in there. I put it all back together and ran it for about 20 minutes and the lower hose still won't heat up. Maybe the engine isn't heating up enough to open the 195 deg. tstat I just put in it. I still don't like it not circulating. I think I am going to buy a lower temp. tstat soon. Thanks for the help all. Anyone think this is weird?
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Old 11-12-2006, 04:16 PM   #9 (permalink)
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Today I drove my car pretty hard for 4 hrs and my thermostat still has not opened!!! Is my car just not heating up enough? I don't think this is normal. Hopefully I'll get a cooler tstat soon and that fixes It.
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Old 11-12-2006, 08:31 PM   #10 (permalink)
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How can you tell if your thermostat has opened?
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Old 11-12-2006, 08:44 PM   #11 (permalink)
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let your car sit overnight to cool. Pop the hood up. Then start your car. get out and open the radiator cap if the fluid is moving then your thermostat is bad, ive done this to most off the cars i used to work on to figure out if thats the problem.
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Old 11-12-2006, 09:06 PM   #12 (permalink)
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the lower hose is going to be cooler than the upper, considering the fact that the upper hose is the fluid coming out of the hot motor, and the bottom hose is supplying the motor with the cool antifreeze from the radiator. my temp never goes above a 1/4 either.
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Old 11-12-2006, 10:16 PM   #13 (permalink)
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let your car sit overnight to cool. Pop the hood up. Then start your car. get out and open the radiator cap if the fluid is moving then your thermostat is bad, ive done this to most off the cars i used to work on to figure out if thats the problem.
shouldnt the fluid move and overflow when the engine is on and the rad cap is off?
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Old 11-12-2006, 10:52 PM   #14 (permalink)
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you can put the tstat on backwards. and also the top hose will be hotter than the bottom, youll know wen ur tstat is ope bc the hose will get hot and it will have pressure wen u squeeze it. try and get a cooler tstat or even take the one u have out and check if its in there rite.
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Old 11-13-2006, 08:45 AM   #15 (permalink)
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you can put the tstat on backwards. and also the top hose will be hotter than the bottom, youll know wen ur tstat is ope bc the hose will get hot and it will have pressure wen u squeeze it. try and get a cooler tstat or even take the one u have out and check if its in there rite.
Is that right?

I thought if the thermostat is closed, fluid will be inhibited from entering the engine causing pressure in the lower hose. Sorry, Im a complete noob at this and want to make sure. I pretty sure I put the tstat in right, i followed all instructions. Spring side goes in towards the engine and matched up the gasket with the teeth in the housing.

Ice-D, I hope you dont mind me asking questions on ur thread. If you do, I'll be happy to start a new thread. Just that I have the similar problem and quite concerned as u are.

thanx
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Old 11-13-2006, 10:44 AM   #16 (permalink)
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How can you tell if your thermostat has opened?
your cooling fan should turn on at least twice while it's sitting at idle, just start it up and let it run. If anyone is looking at getting a cooler thermostat, it will make you car run richer.
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Old 11-13-2006, 11:30 AM   #17 (permalink)
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Is that right?

I thought if the thermostat is closed, fluid will be inhibited from entering the engine causing pressure in the lower hose. Sorry, Im a complete noob at this and want to make sure. I pretty sure I put the tstat in right, i followed all instructions. Spring side goes in towards the engine and matched up the gasket with the teeth in the housing.

Ice-D, I hope you dont mind me asking questions on ur thread. If you do, I'll be happy to start a new thread. Just that I have the similar problem and quite concerned as u are.

thanx
yes i am correct, my dad has been a radiator tech for 15+years and i have been a radiator tech for about 2-3 years on and off, summer job and then recently full time.
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Old 11-13-2006, 11:33 AM   #18 (permalink)
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How can you tell if your thermostat has opened?
you can tell ur tstat has opened bc what you do is full ur car up with coolant while the car is off, then you start it (with the cap still off) and let it idle untile the fan kicks on twice. as soon as the fan kicks on once you should see the coolant level go down in the top of the radiator. if it doesnt go down you tstat is not opening due to being faulty, in backwards, or some other reason that is restricting it from opening. its usually one of the first two
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Old 11-13-2006, 11:39 AM   #19 (permalink)
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check it out:

from a cold start, the upper hose will ghet hot always faster.

The thermostats nowadays get locked open, not closed.

Hondas take forever and a day to warm up while cold and idling.

If a thermostat is bad, the problem 99% of the time is the temp wont stay near the middle of the scale.

if u wanna see if it is opened, get a gasket, and unbolt the thermostst housing when the motor is hot, but not immideately after stopping the motor. You will see it open or closed when u pull it out.
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Old 11-13-2006, 11:40 AM   #20 (permalink)
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have you tried testing the t-stat to see if its shot?
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