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#4588823 - 11/29/17 12:48 PM Thermostat; to drill or not to drill a bleed hole?
Drew99GT Offline


Registered: 10/11/02
Posts: 22128
Loc: Colorado Springs
That is the question; just had to put a new stat in my Corolla; the factory ones come with a jiggle valve, the Stant ones do not, so I drill a small hole in the flange and positioned it at 12 oclock when installing. I know the jiggle valves sort of seal when the flow goes through the thermostat, preventing overcooling. I'm curious if just a small hole will make the car not get up to temp in very cold weather. Thoughts? Who's drilled a stat and had a car in very cold weather?

Thanks

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#4588832 - 11/29/17 12:52 PM Re: Thermostat; to drill or not to drill a bleed hole? [Re: Drew99GT]
Leo99 Offline


Registered: 03/30/14
Posts: 3050
Loc: NJ
I would not drill a hole. I'd use oem if I was worried about whatever it is you're worried about.
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#4588836 - 11/29/17 12:55 PM Re: Thermostat; to drill or not to drill a bleed hole? [Re: Drew99GT]
bullwinkle Offline


Registered: 10/09/04
Posts: 7671
Loc: Cincinnati, OH, USA
I'm on the other side-a small hole is going to allow MUCH less coolant through than the factory bypass will-DRILL BABY DRILL!
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#4588839 - 11/29/17 12:57 PM Re: Thermostat; to drill or not to drill a bleed hole? [Re: Drew99GT]
fenixguy Offline


Registered: 02/08/17
Posts: 307
Loc: NC
I only use OEM thermostats and wouldn't drill holes in them. That being said, as small as those air bleed holes are, I highly doubt you'd ever be able to tell a difference in getting up to temp.
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#4588847 - 11/29/17 01:00 PM Re: Thermostat; to drill or not to drill a bleed hole? [Re: Drew99GT]
redbone3 Online   content


Registered: 06/09/12
Posts: 658
Loc: Reno, NV
Many years ago I blew several Opel water pumps before I learned to drill a bleed hole (In Germany). Drill away.
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#4588857 - 11/29/17 01:05 PM Re: Thermostat; to drill or not to drill a bleed hole? [Re: Drew99GT]
HoosierJeeper Offline


Registered: 11/23/16
Posts: 1276
Loc: WI
If the OEM one has a hole, the replacement needs to.
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#4588886 - 11/29/17 01:23 PM Re: Thermostat; to drill or not to drill a bleed hole? [Re: Drew99GT]
PandaBear Offline


Registered: 08/05/02
Posts: 14220
Loc: Silicon Valley
I wouldn't use that stat if they don't look identical in functionality. I learn 2 painful lessons of going old school all metal radiator from CSF and a STANT radiator cap, that's 2 warped heads and head rebuild.


Edited by PandaBear (11/29/17 01:23 PM)
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#4588901 - 11/29/17 01:41 PM Re: Thermostat; to drill or not to drill a bleed hole? [Re: Drew99GT]
edwardh1 Offline


Registered: 01/17/03
Posts: 2943
Loc: Coastal South Carolina
drill.

my oem isuzu had a small hole with a "wiggle valve" to keep hole clean.
two aftermarket stats I looked at did not. I bought a gates and drilled a hole.
you need a hole to allow quicker flow and stat warmup and to bleed air.
small hole size down from 1/8 inch


Edited by edwardh1 (11/29/17 01:42 PM)
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#4588906 - 11/29/17 01:43 PM Re: Thermostat; to drill or not to drill a bleed hole? [Re: Drew99GT]
mightymousetech Offline


Registered: 04/03/17
Posts: 1444
Loc: Ontario, Canada
Return the one you bought and get an OEM.
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#4588909 - 11/29/17 01:45 PM Re: Thermostat; to drill or not to drill a bleed hole? [Re: Drew99GT]
ARB1977 Offline


Registered: 06/12/05
Posts: 5168
Loc: North Texas
That jiggle valve does something. I saw a 6 to 8 degree drop in operating temps on my Toyota 3.4L installed at the 12 o'clock position.
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#4588913 - 11/29/17 01:47 PM Re: Thermostat; to drill or not to drill a bleed hole? [Re: Drew99GT]
Drew99GT Offline


Registered: 10/11/02
Posts: 22128
Loc: Colorado Springs
OEM is out of the question; dealer doesn't have one, don't have time to order. I've tried Motorad and it ran too cool; I've had good success with Stant in the past, so that's what I used.

Car is running good now; before, it was overcooling in cold weather and starting overheating yesterday; lower hose (inlet side thermostat) was ice cold - old stat was sticking closed.

Thanks for the input so far fellas, I'll report back after a few days if anything abnormal occurs!

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#4588917 - 11/29/17 01:50 PM Re: Thermostat; to drill or not to drill a bleed hole? [Re: Drew99GT]
SatinSilver Offline


Registered: 01/24/08
Posts: 10172
Loc: OH
What year is the car, a 1993? smile

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#4588918 - 11/29/17 01:50 PM Re: Thermostat; to drill or not to drill a bleed hole? [Re: Drew99GT]
OneEyeJack Offline


Registered: 09/14/10
Posts: 7479
Loc: S California
Not having more than an opinion on the subject I'd defer to the OEM setup.

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#4588928 - 11/29/17 01:57 PM Re: Thermostat; to drill or not to drill a bleed hole? [Re: Drew99GT]
demarpaint Offline


Registered: 07/03/05
Posts: 29778
Loc: NY
I learned the hard way years ago to only use OE thermostats. Since that isn't an option, if the OE part had a bleed hole, I'd be inclined to drill one. My OCD 'might' have me order a thermostat from the dealer and replace the aftermarket part when it comes in.
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#4588936 - 11/29/17 02:05 PM Re: Thermostat; to drill or not to drill a bleed hole? [Re: Drew99GT]
BigD1 Offline


Registered: 08/12/15
Posts: 2575
Loc: NC
Altrom Tama brand from NAPA have jiggle valves, and are made in Japan. Tama is what I used on my 92 Toyota pickup.
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