Return to the Cars Forum | Post a Follow-Up

 o
Coolant Temp Gauge

Posted by timbulb (timbulb@hotmail.com) on
Mon, May 19, 08 at 8:17

I have an '02 Mazda B2300 truck. (Basically a Ford Ranger)

The coolant temperature gauge has started to work intermittently. It reads accurately but then just cuts out and reads nothing. Sometimes it'll flutter up and down. I'm assuming/hoping it's just a sensor. My question is, where is the sensor for coolant temperature? I've looked and can't seem to find it.


Follow-Up Postings:

 o
RE: Coolant Temp Gauge

Its usually near the thermostat, but I don't know about the Mazda truck. Look around where the upper radiator hose connects to the engine,and/or the hot side heater hose.


 o
RE: Coolant Temp Gauge

This may or not be helpful. But it can't hurt.
Check the coolant level in the radiator.
If the coolant level gets below the level of the sensor,
it can cause the guage to have oddball readings.
May not be the case here, but it can't hurt to check.

Check the coolant level in the radiator, not just the overflow tank.

Pooh Bear


 o
RE: Coolant Temp Gauge

Funny thing is, my rad has no spot to fill it. It appears the only place to add fluid would be into the reservoir. The rad has no actual cap on it.

How would I ever fill a new one if I replaced it? weird.


 o
RE: Coolant Temp Gauge

Some engines have a fill cap at the thermostat housing. this doesn't permit a complete fill, but may be enough to fill the engine head.

When there is no filler cap a the highest point in the coolanst system, the system is filled by removing the upper radiator hose and filling through the upended hose. You may have to crack open the cap at the thermostat housing (if present) to vent air. When system is full, close the caps, reattach the hose, and fill the overflow bottle to half full, then start the engine. After the engine warms, shut down and cool to suck fluid from the overf;ow bottle. It may require 3 thermal cycles before the system is completely filled. Refill the overflow bottle as needed.

If you find no filler cap, check the overflow bottle. It may have a pressure cap and seal with relief valve. There has to be a relief valve in the system somewhere to limit the pressure in the coolant system.


 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!


Return to the Cars Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Please review our Rules of Play before posting.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.


Learn more about in-text links on this page here