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 21 Dec 2009, 06:16 pm
Junior Member
Join Date: Dec 2009
Posts: 3
Default Overheating Honda civic with full coolant?

2002 Honda civic has had overheating problems and had the radiator replaced. Water pump is fine as well but now the temperature keeps fluctuating . I drove for about 30 min in town and it'll usually be a little below the middle but I saw the needle go slowly to the middle then 3/4 from the top and then it slowly goes back to the middle when I drive but when it's idle it does back up to the 3/4 mark. I checked the coolant and it's full . The heater also blew cold air during that time. What's going on ?
Reply With Quote
  #2 (permalink)  
Old 21 Dec 2009, 06:31 pm
Junior Member
Join Date: Aug 2007
Posts: 9

Have you stood there and made sure the fan kicks on? there are usually two, one for the AC and one to cool the motor when running. These kick on via a switch. If the fans dont run, you will overheat. Try turning on the AC and driving. In the winter that may be enough for now.
Reply With Quote
  #3 (permalink)  
Old 21 Dec 2009, 07:31 pm
Junior Member
Join Date: Oct 2007
Posts: 26

I don't normally deal with Hondas, but this is an all-too-common issue with any car. Overheating + no heat from heater= Air in coolant. It's caused by adding coolant incorrectly. To bleed the air out, do the following:

1. Remove radiator cap (not the overflow bottle cap). It is found by following the top radiator hose back to the engine.

2. Start engine and turn heater on all the way hot with fan speed maxed out.

3. Watch as bubbles come out. Now add coolant to proper level, wait for it to stop bubbling and replace the cap.

This is the correct procedure for topping off coolant as well. You need to run the heater to make it pump coolant through the heater core and force air out of those lines as well. On my Mazda RX-7, there is a coolant level sensor in the top of the radiator and air bubbles get trapped there WAY too often. You probably don't have a coolant level sensor, but the procedure is the same. My mom's 2000 Neon had the same issue from, you guessed it, her adding coolant into the overflow bottle.
Reply With Quote
  #4 (permalink)  
Old 21 Dec 2009, 07:46 pm
Join Date: Sep 2009
Posts: 53

maybe the thermostat went out. its a cheap part to buy at a auto parts store. it shouldn't be an expensive repair, if it is in fact the thermostat. the thermostat tells your car how hot or cold it is. it kicks in the fans when it needs to. have you checked to see if the radiator and ac fan turn on? turn the car on and let it run for 10 minutes. if only one fan comes on or if they don't come on, then you need the fans replaced. i had this problem this past summer in my accord. i got the fan for 30 bucks at a salvage yard. also when i went to replace my thermostat, it didnt have one. i hope this helps out. good luck
Reply With Quote
  #5 (permalink)  
Old 21 Dec 2009, 08:46 pm
Senior Member
Join Date: Jun 2008
Posts: 579

either the thermostat or the radiator cap is bad

my friend had a similar problem but at idle the resevoir tank boils and the thermostat goes to H

he replaced the cap and problem went away
Reply With Quote
  #6 (permalink)  
Old 21 Dec 2009, 09:01 pm
Senior Member
Join Date: Aug 2009
Posts: 500

Check the following

1. low level of coolant

2. bad radiator cap

3. water pump malfunctioning

4. clog radiator

5. fan not working properly

6. loose belt

Hope this helps!
Reply With Quote
  #7 (permalink)  
Old 21 Dec 2009, 09:16 pm
Senior Member
Join Date: Oct 2007
Posts: 881

Always start by checking the fluid level, if it's correct then there could be a problem with the fan not kicking on, wires not installed properly or it wasn't connected at all. If it is kicking on, go in front of the car when the fans on and make sure it wasn't installed backwards, it'll be blowing air out the front of the car instead of sucking air in like it should be, yes some shops really do accidentally install the fan backwards. Reason I think it's the fan is because, from what it sounds like, the car will overheat at idle but when moving the temperature will tend to drop back down or fluctuate because of stop & go traffic and city driving. At 30mph+ there is sufficient air being blown through the radiator without use of the fan to cool the coolant but at idle or speeds below 30mph there is not enough air flow to cool the fluid without a fan and if the fan is failing then the coolant will not be able to cool down thus overheating the engine.

Another possibility, thermostat failed or the wrong temperature rating thermostat was installed. Or the radiator cap is faulty or one with a different rating was installed than the recommended one which I think is around 16lbs. Radiator caps hold pressure in the system to keep the water from boiling and creating air pockets, if there's no pressure the water will boil at at high operating temperatures and create air pockets that will overheat the engine.
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
'92 Acura Integra Overheating and leaking Coolant? Hannah Acura Technical 5 11 Dec 2009 11:16 pm
I have a 1998 Honda Accord V-Tech 6cyl it has been overheating coolant was low so i added still rox1fl Honda Technical 2 18 Jul 2009 08:16 am
92 Civic losing coolant and overheating Honda 2 10 13 Aug 2006 12:47 am
Coolant overheating problem Eric Honda 3 3 10 Jun 2004 12:24 pm
92 Accord leaking coolant, but reserve tank full Kev Honda 3 6 12 Aug 2003 09:12 am

All times are GMT -5. The time now is 12:50 am.

Honda News | Autoblog
Powered by Yahoo Answers

Powered by vBulletin®
Copyright ©2000 - 2020, 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.