Thermostat change
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Junior Member
Joined: Mar 2007
Posts: 1
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From: VT
Engine: 305
Transmission: auto
Thermostat change
I plan to replace the thermostat and coolant sensor on my 305. The books I'm referencing say to drain the coolant. Is this necessary? Years ago I replaced a thermostat and I don't remember draining the coolant. There was just a little overflow when the top hose was removed.
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Joined: Jan 2007
Posts: 1,088
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From: NYTHIRDGEN
Car: 1989 T/A
Engine: PROCHARGED LB9
Transmission: FB BUILT 700r4 2200 stall
Axle/Gears: 10 BOLT EATON 3:73 POSI
Re: Thermostat change
i just did a thermostat last sunday. also drained and flushed all coolant. no u dont have to drain it, but if its been a while why not.
Joined: Mar 2007
Posts: 1,698
Likes: 3
From: NE Pennsylvania
Car: 85 Iroc-Z
Engine: 383 TPI Procharger D1SC
Transmission: TKO600
Axle/Gears: Strange S60 3.73
Re: Thermostat change
It would also be a good idea to flush your cooling system since it probably hasnt been done in a long time. Draining the coolant will just make the job cleaner.
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Joined: Mar 2006
Posts: 690
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From: NY
Car: 86 Iroc
Engine: 383
Transmission: TH350
Axle/Gears: 3:73s!
Re: Thermostat change
Just drain it 1/3 of the way. You just need it so that the level of the antifreeze is below the intake manifold. You dont have to drain it, but once you pull the top hose, antifreeze is going to spill all over your intake.
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