1LOWEA

With my old thermostat installed, the temperture hand used to sit below the "L". The heater never worked either. Me and my dad flushed out the system, and put a new thermostat in, we put a 91* thermo. Now, the heater works perfect, warm and i was happy. But, when i start the car, i let it warm up for 10 mins, drive it, the temp hand goes right up aobe the N, then drops down below the L. Then driveing continously it goes up to the O, then to the L, and back and forth etc etc. As i keep driving it gets less and less bouncy. I did around 2 hours drving on the weekend and it bounces between l and M after the first hour of running. We put the thermo in correct, sealed everything properly, and we used the correct thermo to. Any ideas on what else i should try out?

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1996 EF Fairmont
17" EL Tickford Wheels
2.5" Redback Exhuast
GL PRO SOUND
www.glprosound.com.au

6pAc|30nG|00n

Simple fix, Drill a small hole no more than 3 or 4 mm in the edging of the thermo to allow a small amount of water to constantly flow, problom solved

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94 ED Fairmont Auto.
Pacemaker Extractors, 2.5" Mandrel Exhaust, Hi-Flow Cat, Stright Through Muff, Broadband Intake Manifold, EEC V, Wood Grain Trim.
Thermo Conversion, AU XR8 Intake Snorkel, 10mm Spiral Core Leads, Shift Kit, Mock Dev5a Cam, King Low Springs.
17" ROH Shadow Chrome RT's, K&N Air Filter, LSD Conversion w/ 3.7 Gears.
Proudest Addition: Socks the Brindle Staffy Girl.

1LOWEA

ok i will try that. thnx mate

__________________
1996 EF Fairmont
17" EL Tickford Wheels
2.5" Redback Exhuast
GL PRO SOUND
www.glprosound.com.au

TopGhia

Also make sure you have bled all the air out of the system.

__________________
"I married Miss Right. I just didn't know her first name was Always."

SiX_iN_a_RoW

yep, when u first started the car after filling the coolant back up did u let it run with heater on full and radiator cap on loosely?
If you did it will help bleed all the air out of the system, you will probably lose a few hundred mil's of coolant also.
IF you did that and it still bounces around, then drill a hole

I will be drilling a hole in my next thermostat as I get the morning high temp and sudden drop. after that its fine though as all air is bled from the system as per directions above

__________________
Lets go find that Hotdog tree I planted

Lowered EF Futura
Black Steelies ( too cheap to buy proper mags )

1LOWEA

yes i ran the car with the radiator cap loose for around 15 min and the heater was on full. I think im gona try this hole thing

__________________
1996 EF Fairmont
17" EL Tickford Wheels
2.5" Redback Exhuast
GL PRO SOUND
www.glprosound.com.au

mongrelEB

The other thing to do is tap a hole into the top of the thermostat housing and put a bung plug in it for the purposes of air removal - I did it with mine and DAMN it made my life easier!

__________________

Pacemaker headers + 2.5" exhaust
EF Fairmont interior
MP3 player
Lowered King springs
5 speed manual
EF motor

Newest mod: EF Ghia wiring loom and dash

donuts2001

Yuppp

THERMOSTAT - to be or not to be?

1LOWEA

when you say in the top, where in the top? just on the metal plate?

__________________
1996 EF Fairmont
17" EL Tickford Wheels
2.5" Redback Exhuast
GL PRO SOUND
www.glprosound.com.au

yeah right

Put a ½" BSP threaded hole as high as possible on the bulb of the thermostat housing - and plug it with a proper BSP plug with an allen head.

As a bit of a sideline my XF EFI has 3 points to bleed air from the cooling system- 2 BSP plugs on the head & one of the thermostat bolts has a hole through the centre with a bolt with a seat on the bottom - it's great.