Is it a Radiator clog?

[JunyAccord]

Hello, i have a 1992 Honda Accord Lx 5spd and i have a heater problem where it blows cold air only

-I replaced the heater control unit
-Mixture valve on firewall is functional
-Chaned the thermostat

And still its blowing cold air. Im thinking i should flush the radiator but how do i do it? If not do you think its the heater core? It worked fine last winter but this summer it stopped.

Also this radiator hose is cold even when my car is warmed up. Any input is much appreciated.

[YK86]

Is the hose you pointed out in the pic cold even after a long drive? If so, the thermostat is probably stuck open (although it's not very likely since you already changed it, but there are times new ones fail out of the box).

Are the two hoses that go from the motor to the firewall/heater core hot after driving the car?

A friend's Accord only blew cold air. Turns out the heater core was clogged from using too much rad leak stop powder. I drained the coolant, disconnected the two hoses from the heater core at the firewall, took a garden hose with no end on it and hooked it up to one side and turned the water on to force out all the crap clogging it. Worked fine after. In his case, all hoses were hot after driving but the coolant just wasn't flowing properly into the heater core.

[Smoken_ducky7]

Hello, i have a 1992 Honda Accord Lx 5spd and i have a heater problem where it blows cold air only

-I replaced the heater control unit
-Mixture valve on firewall is functional
-Chaned the thermostat

And still its blowing cold air. Im thinking i should flush the radiator but how do i do it? If not do you think its the heater core? It worked fine last winter but this summer it stopped.

Also this radiator hose is cold even when my car is warmed up. Any input is much appreciated.

do you have anifreze in you car i had just water for a little bit and my heat didnt work i put some atifreze in and it worked but on how to flush it you can go to a parts house and they have this t clap that a hose pipe can conect to all you do is put it on one of you heater hoses

[JunyAccord]

Is the hose you pointed out in the pic cold even after a long drive? If so, the thermostat is probably stuck open (although it's not very likely since you already changed it, but there are times new ones fail out of the box).

Are the two hoses that go from the motor to the firewall/heater core hot after driving the car?

A friend's Accord only blew cold air. Turns out the heater core was clogged from using too much rad leak stop powder. I drained the coolant, disconnected the two hoses from the heater core at the firewall, took a garden hose with no end on it and hooked it up to one side and turned the water on to force out all the crap clogging it. Worked fine after. In his case, all hoses were hot after driving but the coolant just wasn't flowing properly into the heater core.

Yea those other 2 hoses are working fine and its just that 1 hose is cold. Im going to buy another thermostat just to make sure. And i wil also do your little water hose trick.

[NAiL05]

Is the hose you pointed out in the pic cold even after a long drive? If so, the thermostat is probably stuck open (although it's not very likely since you already changed it, but there are times new ones fail out of the box).

Are the two hoses that go from the motor to the firewall/heater core hot after driving the car?

A friend's Accord only blew cold air. Turns out the heater core was clogged from using too much rad leak stop powder. I drained the coolant, disconnected the two hoses from the heater core at the firewall, took a garden hose with no end on it and hooked it up to one side and turned the water on to force out all the crap clogging it. Worked fine after. In his case, all hoses were hot after driving but the coolant just wasn't flowing properly into the heater core.

I have seen bad t-stats before when replacing. Not all new parts are always in good working order. But yea i would check those two hoses going to the firewall. Another thing to check that people forget is to look at the coolant level. Make sure the system is burped properly.