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#1
11-08-2006, 01:29 PM
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Sorry, amateur question - drain coolant necessary for t-stat replacement?
I know this one will be resolved quickly.... and I apologize for the complete amateur question...
Is it necessary to drain the coolant before replacing the thermostat? If it makes any difference, I am asking about the '91 350SD.
__________________
Autos: 1991 350SD 276,000 miles 2001 VW Beetle TDI 115,000 miles Horns: 1955 Selmer Mark VI Alto (55,xxx) 1958 Selmer Mark VI Tenor (85,xxx) 1964 Selmer Mark VI Tenor (125,xxx) 1967 King Super-20 Tenor (430,xxx) 2002 Selmer Series III Soprano For Jazz Saxophone enthusiasts - check out my website... www.RustyBlevins.com 
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#2
11-08-2006, 01:34 PM
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It's a good idea to drop the coolant level below the tstat housing...you can collect it easier from the stopcock down low than from the tstat housing hose = less spillage. But if you have a real big flat pan underneath, you can just undo the housing hose...the less spillage of anitfreeze - the better.
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1983 300SD 307k miles 1993 Ford Escort Wagon 215k miles 1995 Isuzu P'up 214k miles
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#3
11-08-2006, 02:01 PM
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I would drain the coolant before touching the thermostat. Pulling the lower hose will drain the radiator and reservoir. Then there's the coolant in the block behind the thermostat. The thermostat is not much higher than the block drain so I don't imagine much will be left in the system when you pull the thermostat.
The lowest bolt of the thermostat housing is most easily accessed from below so you might as well pull the encapsulation panel to get to the block drain. Sixto 93 300SD Last edited by sixto; 11-08-2006 at 03:52 PM.
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#5
11-08-2006, 02:28 PM
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I did a stat in mine on Sunday. I put the screwdriver on the head of the drain bolt and it fell off. I ended up just pulling the hose off the stat housing neck and draining it there into a 5 gal bucket. I slowly refilled it into the reservoir so that some of the sediment was able to settle out.
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1978 Ford F-150 351M 2002 Kia Spectra 1.8l 5-sp 1985 Volkswagen Scirocco 8V 1.8l 5sp 1985 MB 300D Turbo California "Die Natur verabscheut Vakuum"
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