heater wont work??

[pat nuben]

hey i just finished my jdm h22 swap in to my 90 accord, but now i take it for a drive in about 4 degree weather, and even after its warmed up for about 45 minutes, the heater still wont kick out warm air, the vents are kickin air out but not warm air, anyone know what could be the problem and how to fix it?

[HondaFan81]

Any leaks on the front-passenger side, like under the dash area on the carpet?

[timmy0tool]

it could be that your heater core is not heating up. maybe your knob is actually broken. also check the valve along the coolant line that go into the firewall (under the intake mani). it is known to get stuck closed. that valve should be attached to a cable which is attached to the knob. it should turn and open as you rotate the knob. good luck.

[NAiL05]

You could also check the solenoid that lets the coolant into the heater core. Sometimes that doesnt open.

[pat nuben]

what do you mean by any leaks? water leaking in? or air leaks?

[93sedan]

mice like to crawl into blower motors check that

[pat nuben]

im pretty sure the blower motor is ok, because air kicks out, but the air isnt hot air

[brandenbmx]

Check your thermostat!!!!!
Sticking thermostat will do it evertime. The car will heat up but no coolect circulates....when the car is warm you should squeeze the top radiator hose and holding on the the bottom hose you should feel the pressure in it from you squeexing the top hose. If you dont then you dont have coolent circulating. Also check your coolent level. And if you have enough coolent and you have flow then you need to check your heater core and make sure coolent is making it to the core.

This heating system is Super easy... Few componets and fewer hoses to follow should be a snap

And one last question..... when u swapped the engine did u put a new water pump on? IF NOT YOU SHOULD HAVE !!!! that engine set for who knows how long....... so it is always a rule of thumb that you change the water pump and timing belts on a "used" engine.....
And it is cold enough that the engine may not overheat with out circulation.....
Hope some of this helped

[pat nuben]

for the record it was the valve on the line on the firewall, it was rusted stuck, so i just used rust penetrant and wiggled it back and forth and now it works, thanks for all the input

[Accord13&BA4]

for the record it was the valve on the line on the firewall, it was rusted stuck, so i just used rust penetrant and wiggled it back and forth and now it works, thanks for all the input

Yes.
By the firewall, there is a O-Hook that hooks around that cable to pull, or close the heater vents for the car...
your cable could be stuck...like my Accord...so all you gotta do is unhook that O and pull the levertowards the front...


FIREWALL ------------O unhook pin, pull lever towards front of car...heat should work better...temp fix for winter!

[i_love_cb7]

can anyone take a pic of this??

[HF22T]

so my lil valve works my heater knob works a new radiator and new water pump new thermostat but i still am seeing the same effects blows air just not hot air
any ideas?? i did use some of that liquid aluminium radiator treatment shit when i put the koyo in because it had a pin hole leak but would that clog anything?

[92HondaPower]

Why use treatment if you put a new radiator in? You should have sent it back to the company and gotten a new one. Did you purge the coolant system?

[HF22T]

yes i have purged it although it should not need to be but it was done aswell