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Old 07-30-2003, 05:42   #1 (permalink)
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New thermo put in, still not convinced its 100%

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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Old 07-30-2003, 06:01   #2 (permalink)
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Re: New thermo put in, still not convinced its 100%

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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Old 07-30-2003, 06:25   #3 (permalink)
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Re: New thermo put in, still not convinced its 100%

ok i will try that. thnx mate
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Old 07-30-2003, 10:36   #4 (permalink)
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Re: New thermo put in, still not convinced its 100%

Also make sure you have bled all the air out of the system.
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Old 07-30-2003, 15:26   #5 (permalink)
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Re: New thermo put in, still not convinced its 100%

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
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Old 07-30-2003, 15:41   #6 (permalink)
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Re: New thermo put in, still not convinced its 100%

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
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Old 07-30-2003, 16:48   #7 (permalink)
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Re: New thermo put in, still not convinced its 100%

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!
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Old 07-30-2003, 21:27   #8 (permalink)
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Re: New thermo put in, still not convinced its 100%

Yuppp

THERMOSTAT - to be or not to be?
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Old 07-31-2003, 00:56   #9 (permalink)
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Re: New thermo put in, still not convinced its 100%

when you say in the top, where in the top? just on the metal plate?
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Old 07-31-2003, 01:35   #10 (permalink)
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Re: New thermo put in, still not convinced its 100%

Put a " 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.
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