Majdan42

Frustrating!
Just when real winter started and temp. is well below zero, my 2005 Acura El giveup on heat. At first there was heat when driving, blowing cold air more and now barely any heat even when accelerate.
Interesting: engine never overheating, coolant tank full/overflowing,almost no coolant in radiator...
What's done after issue started:
Coolant system flush, replaced thermostat, presure test/holds presure,no leaks,replaced radiator cap...
Acura El 1.7 is the same engine like Honda civic es/Si so if anyone had same issue with any of those models, please help!?
If desired contact directly on email
mgolf@hotmail.com
Thanks in advance

NBP04TL4ME

Lots off possibilities:

Air in system
Head gasket blown
Heater control valve or cable on firewall
Bad heater core

Can you provide more details?

Majdan42

None of those sir!
It's a Canadian only model 2005 acura 1.7 EL but excact the same engine
in Honda Civic EX/05
Small engine 1.7 liter/4 cylinder
I can see that there is many possibilities that's why I am looking for advices from someone who already had same issue and fixed problem already
But thanks for help anyway

NBP04TL4ME

So you have tested and/or looked at and ruled out all of these already?

In your post you said it hadn't overheated, yet there was almost no coolant in the radiator. Where did it go?

Majdan42

Well it seems it goes to coolant tank/overflow which happens to be full to the top and then leeks out on the cap of the tank during driving.
I'm confused to. When i check engine oil it looks fine.
Looks like plagued up hose between tank and rad but I got system flushed and presure test and the system was holding the presure.
They also refilled coolant in rad to get air out of the system after flush and by that time coolant level in tank was between min and max.
I can't see coolant in rad when I remove the cap but I should not add more coolant to the rad?
Thanks for response again

NBP04TL4ME

The volume of fluid the radiator can hold is much larger than the overflow bottle. The overflow bottle is exactly that - for overflow and expansion of coolant. As the engine heats up, the coolant (which is a liquid) heats and expands and needs a place to go. It goes to the overflow bottle, but the reverse is true as well. When you turn the engine off and it cools, the coolant cools and contracts. Long story short the coolant level in the overflow bottle should be and remain between min and max and not be overflowing.
I'm going to guess there is some sort of blockage between the radiator and the overflow bottle, which may be rust or other contaminants from you radiator flush or may have existed prior and persists.
In terms of the fluid in the radiator you should be able to see it when you take the cap off (check this only when the engine is cold - safety first) and I would keep tabs on this. You have said you car hasn't overheated, but this may happen if your fluid is low.
I would say all the maintenance you had done hasn't remedied your original issue.

Aman

Sounds like heater core to me.

Majdan42

Thanks everyone for suggestions and advice
There is certainly time, if just wouldn't be this cold those days, to properly clean out the system and check everything from hoses, tank, heating core etc.
Since there could be many reasons it is frustrating to pay for one thing and not get the problem fixed.
Thank you again

Owen Griffiths

Did you find the answer to the problem? I have a similar issue.