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post #1 of 3 (permalink) Old 08-12-05, 01:25 AM Thread Starter
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89Falcon's Avatar
Join Date: Sep 2004
Location: New Zealand
Age: 27
Posts: 48
Question Heat Gauge Troubles

The Heat gauge in my EA has been playing up recently
i thought it was the car so replaced the thermostat and replaced the header tank cap (which was F**ked anyway)
but what happens is when it gets up to temperature the heat gauge goes up to the "R" then drops right back to below the "L" then back up then down then up then down etc etc. it does it slowly but you can notice it as you are driving
im thinking it is an electrical fault but dont know what it is and how to deal with it

your help is much appreciated

Previous Rides:
1989 EA Falcon GL 4.0 LPG 5spd (ex 3spd auto)
1990 EA Fairmont Ghia 3.9 MPI 4spd Auto
1989 EA Falcon S 3.9 MPI 5spd

Current Rides
1989 EA Falcon S 3.9 MPI 5 spd
1990 EA Fairmont Ghia 3.9 MPI No Speed (soon to be manual)

And Still not sick of them yet
Havnt Blown a head gasket yet either
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post #2 of 3 (permalink) Old 08-12-05, 06:50 AM
NB & NCII V8 Fairlanes
Join Date: Feb 2001
Location: Bibra Lake Western Australia
Posts: 3,072
Re: Heat Gauge Troubles

It's somewhat normal (for the temp to go up and down as the thermostat opens and closes) but did you follow the correct procedure for refilling the system so all the air is bled from teh system?

Regards Blue
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post #3 of 3 (permalink) Old 08-13-05, 05:00 PM
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Join Date: Jun 2004
Location: Cairns, Australia
Posts: 538
Re: Heat Gauge Troubles

You should check you radiator - you'll probably have to flush the casting sand from the engine out - I think you need to do it a few times over a few years to get it all out - sand left in the block and head from the casting process evidently...
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