Honda Civic / Del Sol (1992 - 2000) EG/EH/EJ/EK/EM1 Discussion

Running out of coolant when AC is on & AC issues! Help heat is killing me d16y7

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Old Jun 11, 2012 | 12:45 PM
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Icon6 Running out of coolant when AC is on & AC issues! Help heat is killing me d16y7

I recently got my head and water pump replaced.
But it's been doing this before I replaced them and my AC only gets colder/cold when car is in motion, if I'm at a stop my AC slowly gets hot until my car is in motion again & it drains all the coolant out and I know I don't have a leak because it only happens when my AC is on. Does this issues happen to anyone?!

Engine d16y7 1998
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Old Jun 11, 2012 | 12:46 PM
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Default Re: Running out of Cosby when AC is on & AC issues! Help heat is killing me d16y7

Coolant dam iPhone autocorrect!
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Old Jun 11, 2012 | 12:50 PM
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Default Re: Running out of Cosby when AC is on & AC issues! Help heat is killing me d16y7

I don't see how the two systems are even remotely interconnected. Sounds like you have two separate issues. As far as coolant goes, if you're not leaking it, then you're burning it.
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Old Jun 11, 2012 | 12:58 PM
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Default Re: Running out of Cosby when AC is on & AC issues! Help heat is killing me d16y7

Originally Posted by grumblemarc
I don't see how the two systems are even remotely interconnected. Sounds like you have two separate issues. As far as coolant goes, if you're not leaking it, then you're burning it.


The a/c system.....SMH. One thing you have to look at is the condenser fan. If the radiator and condenser fan DO NOT turn on at the same time you hit that a/c switch then you have a problem. If the condenser fan doesn't turn on, then that would explain why the a/c only works when the car is moving. If the condenser isn't cooled down why the a/c is on, it'll trip the high pressure switch, shutting the whole system off. It's a safety switch for the system. Make sure the obvious things are working and come back on here with an update.
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Old Jun 11, 2012 | 01:30 PM
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Default Re: Running out of Cosby when AC is on & AC issues! Help heat is killing me d16y7

Originally Posted by noz79
One thing you have to look at is the condenser fan.
This^

Originally Posted by noz79
If the radiator and condenser fan DO NOT turn on at the same time you hit that a/c switch then you have a problem.
The condenser and radiator fans have separate controls in our Civics. They can run independently of one another under normal conditions. However, definitely check whether the radiator fan fails to run when the engine gets too hot. Carefully watch the temp gauge in the cluster. It should never read at or above the halfway mark. If it does, stop the engine because it's overheating.
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Old Jun 11, 2012 | 01:31 PM
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Default Re: Running out of Cosby when AC is on & AC issues! Help heat is killing me d16y7

Originally Posted by noz79


The a/c system.....SMH. One thing you have to look at is the condenser fan. If the radiator and condenser fan DO NOT turn on at the same time you hit that a/c switch then you have a problem. If the condenser fan doesn't turn on, then that would explain why the a/c only works when the car is moving. If the condenser isn't cooled down why the a/c is on, it'll trip the high pressure switch, shutting the whole system off. It's a safety switch for the system. Make sure the obvious things are working and come back on here with an update.
Correct none of the fans turn on, but alot of my friends kept telling me they dont turn on "unless your car starts to over heat" but they never listen to me...So since none of them turn on do you know what the pinpoint issue can be?Its getting so hot in CALI haha


BTW fuses work relays ticking
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Old Jun 11, 2012 | 01:32 PM
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Default Re: Running out of Cosby when AC is on & AC issues! Help heat is killing me d16y7

Originally Posted by grumblemarc
I don't see how the two systems are even remotely interconnected. Sounds like you have two separate issues. As far as coolant goes, if you're not leaking it, then you're burning it.
Is it bad when coolant is burned?
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Old Jun 11, 2012 | 01:37 PM
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Originally Posted by Aaron Cayabyab
Is it bad when coolant is burned?
Yes always.

And just because the relays click does not rule out a blown fuse. Most of the relays involve two separate fused circuits.
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Old Jun 11, 2012 | 01:38 PM
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Default Re: Running out of coolant when AC is on & AC issues! Help heat is killing me d16y7

Originally Posted by Aaron Cayabyab
Correct none of the fans turn on, but alot of my friends kept telling me they dont turn on "unless your car starts to over heat" but they never listen to me...So since none of them turn on do you know what the pinpoint issue can be?Its getting so hot in CALI haha
Originally Posted by Aaron Cayabyab
Is it bad when coolant is burned?
Aaron, DO NOT LISTEN TO YOUR FRIENDS, for car advice anyway. The condenser fan should turn on when the A/C button is turned on. Immediately.

Did the person who replaced the head and water pump bleed the cooling system?

Burned coolant? Describe to us what it looks like.

Last edited by noz79; Jun 11, 2012 at 02:09 PM.
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Old Jun 11, 2012 | 01:39 PM
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Default Re: Running out of coolant when AC is on & AC issues! Help heat is killing me d16y7

Originally Posted by noz79
Both fans should turn on when the A/C button is turned on. Immediately.
Wrong
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Old Jun 11, 2012 | 01:40 PM
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Default Re: Running out of Cosby when AC is on & AC issues! Help heat is killing me d16y7

Originally Posted by RonJ@HT
Yes always.

And just because the relays click does not rule out a blown fuse. Most of the relays involve two separate fused circuits.


Funny how many threads I've read and you go immediately to the fuses and it ends up being the problem. I overlook this as a problem cause I assume they check this first.
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Old Jun 11, 2012 | 01:41 PM
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Default Re: Running out of coolant when AC is on & AC issues! Help heat is killing me d16y7

Originally Posted by noz79
Aaron, DO NOT LISTEN TO YOUR FRIENDS, for car advice anyway. Both fans should turn on when the A/C button is turned on. Immediately.

Did the person who replaced the head and water pump bleed the cooling system?

Burned coolant? Describe to us what it looks like.
^^ LMAO

Anyways, yeah i blown the head gasket so he bleed everything and replaced my timing plus water pump(leaking) and added new coolant, Thing is none of the fan even worked before this whole thing happened.
And my coolant only burns when my AC is on but daily driving its doesnt burn ONLY WITH AC ON it wil be gone!
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Old Jun 11, 2012 | 01:41 PM
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Default Re: Running out of coolant when AC is on & AC issues! Help heat is killing me d16y7

Originally Posted by RonJ@HT
Wrong
How am I wrong?
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Old Jun 11, 2012 | 01:43 PM
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Default Re: Running out of coolant when AC is on & AC issues! Help heat is killing me d16y7

Originally Posted by noz79
How am I wrong?
What you said is true for 7th generation Civics, not 5th and 6th generation Civics. For the latter, the radiator and condenser fans have completely independent controls.
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Old Jun 11, 2012 | 01:43 PM
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Default Re: Running out of Cosby when AC is on & AC issues! Help heat is killing me d16y7

Originally Posted by noz79


Funny how many threads I've read and you go immediately to the fuses and it ends up being the problem. I overlook this as a problem cause I assume they check this first.
it aint the fuses i checked millions of times haha
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Old Jun 11, 2012 | 01:45 PM
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Default Re: Running out of coolant when AC is on & AC issues! Help heat is killing me d16y7

Originally Posted by Aaron Cayabyab
^^ LMAO

Anyways, yeah i blown the head gasket so he bleed everything and replaced my timing plus water pump(leaking) and added new coolant
When the head gasket is blown, the head gasket must be replaced and the head must be milled flat or replaced if it is warped.
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Old Jun 11, 2012 | 01:45 PM
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Default Re: Running out of coolant when AC is on & AC issues! Help heat is killing me d16y7

Originally Posted by Aaron Cayabyab
^^ LMAO

Anyways, yeah i blown the head gasket so he bleed everything and replaced my timing plus water pump(leaking) and added new coolant, Thing is none of the fan even worked before this whole thing happened.
And my coolant only burns when my AC is on but daily driving its doesnt burn ONLY WITH AC ON it wil be gone!
Unplug your fans and run direct voltage to your Radiator fan then your condenser fan to see if they even work.
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Old Jun 11, 2012 | 01:45 PM
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Default Re: Running out of Cosby when AC is on & AC issues! Help heat is killing me d16y7

Originally Posted by Aaron Cayabyab
it aint the fuses i checked millions of times haha
Dubious until you properly check the right ones.
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Old Jun 11, 2012 | 01:47 PM
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Default Re: Running out of coolant when AC is on & AC issues! Help heat is killing me d16y7

Burning as in the engine is burning it in the combustion chamber. Source-headgasket, warped head or cracked block. Did you replace the headgasket?
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Old Jun 11, 2012 | 01:47 PM
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Default Re: Running out of Cosby when AC is on & AC issues! Help heat is killing me d16y7

Originally Posted by RonJ@HT
Dubious until you properly check the right ones.
Electronics Major, I even used a DDM to check all my fuses under the engine and dash. Jumped my condenser fan straight to a 12v to see if it even span still.
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Old Jun 11, 2012 | 01:49 PM
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Default Re: Running out of coolant when AC is on & AC issues! Help heat is killing me d16y7

Originally Posted by noz79
Unplug your fans and run direct voltage to your Radiator fan then your condenser fan to see if they even work.
Been there done that.. =[ HATE THE HEAT!

It does kick in when my car gets a little hot! lol
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Old Jun 11, 2012 | 01:51 PM
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Default Re: Running out of Cosby when AC is on & AC issues! Help heat is killing me d16y7

Originally Posted by Aaron Cayabyab
Electronics Major, I even used a DDM to check all my fuses under the engine and dash. Jumped my condenser fan straight to a 12v to see if it even span still.
So what were the results of your tests. What fuses did your test? Post the numbers.

And any electronics major should be able to tell us lickity split why the radiator and condenser fans don't work. Have you looked at the circuit diagrams of both?
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Old Jun 11, 2012 | 01:53 PM
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Default Re: Running out of Cosby when AC is on & AC issues! Help heat is killing me d16y7

Originally Posted by RonJ@HT
So what were the results of your tests. Post the numbers.

And any electronics major should be able to tell us lickity split why the radiator and condenser fans don't work. Have you looked at the circuit diagrams of both?
Test results were no open circuits all closed, And honestly i haven't looked into a car diagram period haha i dont know much in cars wiring n ****.
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Old Jun 11, 2012 | 01:57 PM
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Default Re: Running out of coolant when AC is on & AC issues! Help heat is killing me d16y7

Originally Posted by RonJ@HT
What you said is true for 7th generation Civics, not 5th and 6th generation Civics. For the latter, the radiator and condenser fans have completely independent controls.
I was wrong. Only the condenser fan should turn on with this generation. The ECU isn't as advanced as the newer models.
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Old Jun 11, 2012 | 01:57 PM
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Default Re: Running out of coolant when AC is on & AC issues! Help heat is killing me d16y7

Originally Posted by noz79
I was wrong. Only the condenser fan should turn on with this generation. The ECU isn't as advanced as the newer models.
Only time it turns on is when car gets hot

but i do have two fans and never saw the other fan ever turn on lol
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