Thermostat Replacement -

Closed Thread
Thread Tools Search this Thread
Old 02-23-2010, 05:59 PM
cvcrcr99's Avatar
Thread Starter
Join Date: Aug 2007
Location: DUB Caeser
Posts: 7,086
Default Thermostat Replacement

1. Why would you want to do this?

If your thermostat is stuck closed (over heating car), or stuck open (car not warming up at all), or leaking, you would want to replace your T-Stat.

2. How long does this take?

About 45-60 minutes.

3. Precautions?

Never open the radiator cap/release pressure in the system when the car's engine is warm, or immediately after operating. Use jackstands.

4. What's needed?
Replacement T-Stat
Coolant (Honda genuine coolant is best IMO - 2 gallons at least)
10mm socket
socket wrench
socket wrench extensions

Step 1 – Drain Coolant

Jack up the car. Usually, it is easier to drain the coolant when the front of the car is lower than the rear.

Remove radiator cap. Crawl under the car and open petcock to drain the coolant from the system. Once it is slowly dripping, you can squeeze the lower (and possibly the upper) hoses to get more of the coolant out. If you plan on re-using the coolant, have a clean drain pan underneath it.

Step 2 – Remove Lower Radiator Hose

Get a pair of pliers, loosen the metal clip, move it back and away from where the hose connects to the radiator.

Now, follow the lower radiator hose back to where it meets the block, and remove the metal clip the same way as before.

And the hose should be off.

*Be sure to clean everything up, especially if it looks like this!*

Step 3 – Remove Thermostat Housing

Unplug the fan switch solenoid (green). Unbolt ground wire (white). Remove the two bolts holding the thermostat housing to the block (red).

At this point, the housing should come off. This is what it looks like now after taking the thermostat out, too.

Add sealant/gasket maker where the T-stat meets the block to prevent leaks. Allow to fully cured before driving the care. Check product label for curing/drying times.

Step 4 – Putting It All Back Together

Line up the air release valve with the groove(s) on the thermostat housing and block.

Place Thermostat onto the block.

Reinstall thermostat housing, fan switch, and lower radiator hose. Finally, close petcock on radiator.

Fill radiator with coolant, and bleed for air. You are done!

Last edited by WellFedHobo; 02-25-2010 at 01:15 PM.
Old 02-23-2010, 06:06 PM
WellFedHobo's Avatar

Join Date: Jul 2007
Location: Arkansucks
Posts: 4,942

I also recommend replacing the thermostat gasket at the same time if your new one doesn't come with one. Cheap insurance policy.
Closed Thread

Related Topics
Thread Thread Starter Forum Replies Last Post
Thermostat and ECT switch replacement Ska-T Mechanical Problems & Technical Chat 2 07-08-2012 11:40 AM
Engine heating - Thermostat replacement UnicornJuices Engine & Internal 2 06-11-2011 06:03 PM
Engine heating - Thermostat replacement UnicornJuices Engine & Internal 0 06-04-2011 06:44 PM
Thermostat & ECT switch replacement? Ska-T General Civic Talk 0 05-27-2010 09:32 PM
thermostat housing scottk Engine & Internal 1 01-10-2005 09:34 PM

7th, 99, air, civic, dyi, generation, honda, location, release, replace, replacing, thermostat, therostate, valve, visual

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 Off
Pingbacks are Off
Refbacks are Off

All times are GMT -8. The time now is 11:11 PM.