heater blows cold..
Recognized HCF Member
Joined: Sep 2007
Posts: 9,453
From: Houston, Texas
RE: heater blows cold..
If your coolant level is okay, then check these other possibilities for a 1996-1998 Civic (see picture).
The 1999-2000 Civic, on the other hand, has a self-diagnosis function (see picture in next post).
[IMG]local://upfiles/25538/D624777046D544DEB591D23FBD4F5780.jpg[/IMG]
The 1999-2000 Civic, on the other hand, has a self-diagnosis function (see picture in next post).
[IMG]local://upfiles/25538/D624777046D544DEB591D23FBD4F5780.jpg[/IMG]
Thread Starter
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HCF Member
Joined: Feb 2006
Posts: 219
From:
RE: heater blows cold..
No the engine temp comes up to normal, but i still never get any warm air to blow into the car. Its cold in the winter i need to get this working lol. Ill check out the stuff you guys mentioned thanks.
HCF Member
Joined: Jul 2005
Posts: 7,994
From: Rochester, NY
RE: heater blows cold..
ORIGINAL: redridinhood
No the engine temp comes up to normal, but i still never get any warm air to blow into the car. Its cold in the winter i need to get this working lol. Ill check out the stuff you guys mentioned thanks.
No the engine temp comes up to normal, but i still never get any warm air to blow into the car. Its cold in the winter i need to get this working lol. Ill check out the stuff you guys mentioned thanks.
Recognized HCF Member
Joined: Jun 2007
Posts: 10,023
RE: heater blows cold..
The thermostat controls flow thru the radiator only. Hot water from the engine can always flow to the heater core. But there is a valve controlled by the temperature lever on the dash. When it is on cold the valve closes, on hot it is open.
So I'd check the valve next. It's mounted on the firewall under the hood with a heater hose leading in and out of it and a mechanical cable that is ultimately controlled by the lever on the dash. Make sure it moves when you move the lever.
If the valve seems OK then warm up the engine and set the heater on hot and feel both of the heater hoses to the firewall. They should both be hot. If only one is hot then there is likely a blockage in the valve or heater core. Sometimes that can be flushed out by draining the system disconnecting the hoses and flushing water thru the core with a garden hose.
If both hoses are hot then the air control door inside the car must be the problem as it is diverting the air around the heater core. That is supposed to happen with the control on cold but when you set it to hot the door moves and air goes thru the heater core.
So I'd check the valve next. It's mounted on the firewall under the hood with a heater hose leading in and out of it and a mechanical cable that is ultimately controlled by the lever on the dash. Make sure it moves when you move the lever.
If the valve seems OK then warm up the engine and set the heater on hot and feel both of the heater hoses to the firewall. They should both be hot. If only one is hot then there is likely a blockage in the valve or heater core. Sometimes that can be flushed out by draining the system disconnecting the hoses and flushing water thru the core with a garden hose.
If both hoses are hot then the air control door inside the car must be the problem as it is diverting the air around the heater core. That is supposed to happen with the control on cold but when you set it to hot the door moves and air goes thru the heater core.