Coolant gauge going bonkers.

[MA70Snowman]

Okay My coolant gauge has recently been going bonkers.:aigo: normal driving it reads fine (cold when cold. warm when warm) but when I come to a stop and idle (actually anything <1000 RPMS) it fluxuates between below 0 and the 3rd tick mark. but as soon as I get moving again. it levels out where its supposed to be. I have no idea why this would be functioning like this. anyone seen this before or any ideas...

 

[supra_ed]

i had a similar problem- at idle read fine, but if u touched throttle it went stupid. check the wire connection at the temp switch- in thermostat housing. it might be loose or have so gunk in there causing it not to have a good connection

 

[MA70Snowman]

yeah that was my first guess too. but everything checked fine. redid the wiring too.

 

[supra_ed]

it might be sensor itself. do u have any other issues with other guages? if so it might be problem with grounding

 

[ViR2]

is your vacuum OK? any leaks?

 

[MA70Snowman]

guess i Should have been more through in the beginning, i was in a rush writing the first post.

*new sensor
*No other gauges have problems
*Vacuum is fine
*No codes
*Everything else checks out fine.

 

[MA70Snowman]

is your vacuum OK? any leaks?

... and would vacuum have anything to do w/ my coolant temp gauge?

 

[supra_ed]

its gotta be wiring or the gauge itself