imported_gatherer

ok as some of you know I've have a few issues with the car I've bought nothing I couldn't handle but definaintly stuff I needed help pointing me in the right direction


ok so heater cores... I get no hot air out of my vents... I checked the heater valve it was seized so I manually opened that still no hot air... what else could cause this?

imported_spl_civic

sticky thermostat?
not too knowledgable in this field

imported_Cablerat

This on your CX?

You sure coolant is flowing through the core? Coolant flow could be blocked. You have air though right? Then core fan is working.

Thermostat wouldn't have anyting to do with it ( I don't think... )
That controls the flow to the rad.

Heater core in and out are seperate lines that flow from engine to core and back to engine.

imported_gatherer

no this is my 1990 honda civic SI

yes the fan is working as I'm painfully aware of after being blasted by cold air

there still could be a blockage and so I'm probably going to replace hoses.....

bbarbulo

iTrader: (2)

heater cores start to leak, lose fins, squirrles make nests in them, etc, etc... so there are all kinds of problems you could have. It's located kinda behind the glovebox, there are a couple of nuts you gotta remove in the engine compartment on the firewall (good luck) and then you can remove the heater core and have it rebuilt at a rad shop or get a new one. But yeah... as long as the valve is working, and the engine heats up... and there are no air bubbles in your system, there should be heat!!

imported_gatherer

so air bubbles could reduce the effectiveness of heat transfer....

I know it's not leaking cause there ain't any fluid in the car

bbarbulo

iTrader: (2)

no, just if you get mad vapour lock in your cooling system and the heater core effectively gets cut off... that's why when flush and refilling the system you put the heater on full hot and let the car run till 2 fan cycles pass.

imported_gatherer

thanks Bruno... I'll get the bleeder valve I need and try that ... I have to replace some other stuff too... going to be fun ...

Cynikal.Mindset

my old 90 Si did the same thing, I'm convinced that the heater core was blocked as I tried everything but taking out the heater core...so upto last december I had a car with no heat, it wasnt fun at all

you can take off both heater core hoses and blow some compressed air through one and if it dont come out the other one then u know she is all blocked up...and heck you might even be able to blow the clog out while you are at it

imported_gatherer

Cynical your a genius man....

good thing I have a compressor .... time to up block the core

bbarbulo

iTrader: (2)

careful taking off the hoses, generally they have bonded to the core already, so go slowly, maybe cut a slit in in first and spray wd40 in there to loosen the grip so you can twist the hoses off. Cynikal, that is a great idea.

imported_gatherer

yes new hoses so the old ones will be cut off muahahahahaha

imported_trackhack

Also try putting water through from your garden hose, that way you can actually see how well it's flowing and whether or not there is a severe blockage.