Honda Car Forum


Go Back   Honda Car Forum - Accord Parts Civic Tuning Acura Racing > Discussion > Honda Technical

LinkBack Thread Tools Display Modes
  #1 (permalink)  
Old 20 Dec 2010, 08:16 pm
Junior Member
Join Date: Dec 2010
Posts: 1
Default heat wont get hot in civic?

Hi guys, my gf has a 94 civic ex, and its getting to be freezing weather now. When I go to turn the heat on, air comes out of the vents just fine, only it never turns hot. Is this a simple fix? Thanks!
Reply With Quote
  #2 (permalink)  
Old 20 Dec 2010, 08:31 pm
Junior Member
Join Date: Apr 2008
Posts: 4

The little 4 cylinder engines don't generate that much heat to start with. But it should blow out warm air after it has warmed up just the same. Does the temp gauge reach "normal" operating temperature? With out having that answer, maybe the thermostat needs to be replaced. Used to be when a thermostat failed, it failed in the close position most of the time - not good. Now they're designed to fail in the open position to prevent over heating the engine. So if it isn't working, it's in the open position and this prevents the water from getting warm since it is continuously circulated through the radiator too much.
Reply With Quote
  #3 (permalink)  
Old 20 Dec 2010, 08:46 pm
Junior Member
Join Date: Dec 2010
Posts: 1

Is the temp control lever working , can you hear the door open and close , find your heater hoses under the hood , warm the car up and put your hand one each one of the heater hoses to see if they get hot .If only one is hot your heater core is plugged . Replace it , and flush your cooling system .
Reply With Quote
  #4 (permalink)  
Old 20 Dec 2010, 09:01 pm
Senior Member
Join Date: Aug 2007
Posts: 1,032

Assuming the coolant level is okay, the most likely cause is the heater control valve, under the hood, near the firewall, in one of the heater hoses. There will be a small lever on it that should move when the temperature knob is turned. As they age they get too stiff to move by the knob and have to be moved by hand. Replacement is not as easy as it looks because the hose gets a death grip on the fragile heater core pipe. Fortunately, she will see you as a hero if you open it now and close it in the spring.
Reply With Quote
  #5 (permalink)  
Old 20 Dec 2010, 09:16 pm
Junior Member
Join Date: Jan 2010
Posts: 10

Look for the following:

1.) Check to make sure the Hot/Cold knob is actually turning the stud in the control. The clip on the back usually cracks and allows the knob to turn but not the shaft its attached to.

2.) If #1 is OK, then check to make sure the hot/cold plenum door is working. It may be gummed up or the servo may be bad.

3.) If #1 & #2 check out, replace the thermostat on the engine. If its stuck open the heat will barely get warm.
Reply With Quote
  #6 (permalink)  
Old 20 Dec 2010, 09:31 pm
Join Date: Dec 2010
Posts: 46

i would check the thermostat first then if it still working i would check the heater core which i s under the dash not a fun job
Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
i have a 97 h22 civic but theres a prob with the heat,the heat dnt wrk and theres a bubbling Jj R Honda Technical 4 17 Oct 2010 08:31 pm
1990 acura integra ls wont start in the heat? Adriana Acura Technical 4 03 Sep 2010 08:27 pm
my 1994 honda accord horn wont blow or air/heat wont blow. window wont go up or down..this jeffjho Honda Technical 1 14 Dec 2009 02:16 am
Heat wont blow out of vents in 2004 Honda Accord EX-LV6? baby_menehune13 Honda Technical 3 02 Dec 2008 10:01 am
how do i avoid engine heat going into my Short Ram intake? Is a heat shield the only option? Jun S Honda Technical 6 28 Jan 2008 01:31 am

All times are GMT -5. The time now is 12:25 am.

Honda News | Autoblog
Powered by Yahoo Answers

Powered by vBulletin®
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
LinkBacks Enabled by vBSEO 3.6.0 PL2 © 2011, Crawlability, Inc. is not affiliated with Honda Motor Company in any way. Honda Motor Company does not sponsor, support, or endorse in any way. Copyright/trademark/sales mark infringements are not intended or implied.