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Thermostat; to drill or not to drill a bleed hole? #4588823
11/29/17 01:48 PM
11/29/17 01:48 PM
Joined: Oct 2002
Posts: 22,162
Colorado Springs
Drew99GT Offline OP
Drew99GT  Offline OP
Joined: Oct 2002
Posts: 22,162
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

Re: Thermostat; to drill or not to drill a bleed hole? [Re: Drew99GT] #4588832
11/29/17 01:52 PM
11/29/17 01:52 PM
Joined: Mar 2014
Posts: 3,272
NJ
Leo99 Offline
Leo99  Offline
Joined: Mar 2014
Posts: 3,272
NJ
I would not drill a hole. I'd use oem if I was worried about whatever it is you're worried about.


Without data you're just another person with an opinion. W. E. Deming

2003 Corolla 250,000 miles
2004 Rav4 359,000 miles
2015 Camry 59,000 miles
Re: Thermostat; to drill or not to drill a bleed hole? [Re: Drew99GT] #4588836
11/29/17 01:55 PM
11/29/17 01:55 PM
Joined: Oct 2004
Posts: 7,988
Cincinnati, OH, USA
bullwinkle Online confused
bullwinkle  Online Confused
Joined: Oct 2004
Posts: 7,988
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!


06 Ram 3500 CTD 4X4(FG Venturi), 93 GMC C3500 6.2, 89 F-450 7.3, 98 XJ 4.0(XG8A), 05 xB(XG3600), 18 Transit 3.7, 03 Merc Grand Marquis 4.6 2V(XG2)
Re: Thermostat; to drill or not to drill a bleed hole? [Re: Drew99GT] #4588839
11/29/17 01:57 PM
11/29/17 01:57 PM
Joined: Feb 2017
Posts: 314
NC
fenixguy Offline
fenixguy  Offline
Joined: Feb 2017
Posts: 314
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.


'16 Frontier SV 4x4-PP/Nissan OEM
'08 CR-V EX AWD-Valvoline Syn MaxLife/Fram TG
'01 Civic EX-Valvoline Syn MaxLife/Fram UG
'00 Civic LX-PYB/Fram UG
Re: Thermostat; to drill or not to drill a bleed hole? [Re: Drew99GT] #4588847
11/29/17 02:00 PM
11/29/17 02:00 PM
Joined: Jun 2012
Posts: 678
Reno, NV
redbone3 Offline
redbone3  Offline
Joined: Jun 2012
Posts: 678
Reno, NV
Many years ago I blew several Opel water pumps before I learned to drill a bleed hole (In Germany). Drill away.


2014 Passat Wolfsburg, 1995 Miata.
Re: Thermostat; to drill or not to drill a bleed hole? [Re: Drew99GT] #4588857
11/29/17 02:05 PM
11/29/17 02:05 PM
Joined: Nov 2016
Posts: 1,278
WI
HoosierJeeper Offline
HoosierJeeper  Offline
Joined: Nov 2016
Posts: 1,278
WI
If the OEM one has a hole, the replacement needs to.


15 Jeep KL Limited V6: Formula Shell 5W20
07 LR3 SE V8: Maxlife 5W30
05 Jeep KJ Limited: PHM 5W30
96 Jeep XJ Country: STP HM 5W30 (winter)
Re: Thermostat; to drill or not to drill a bleed hole? [Re: Drew99GT] #4588886
11/29/17 02:23 PM
11/29/17 02:23 PM
Joined: Aug 2002
Posts: 14,424
Silicon Valley
PandaBear Offline
PandaBear  Offline
Joined: Aug 2002
Posts: 14,424
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.

Last edited by PandaBear; 11/29/17 02:23 PM.

"You keep asking questions PandaBear and you'll end up a vegetarian like my wife" - Camu Mahubah
Re: Thermostat; to drill or not to drill a bleed hole? [Re: Drew99GT] #4588901
11/29/17 02:41 PM
11/29/17 02:41 PM
Joined: Jan 2003
Posts: 3,081
Coastal South Carolina
edwardh1 Offline
edwardh1  Offline
Joined: Jan 2003
Posts: 3,081
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

Last edited by edwardh1; 11/29/17 02:42 PM.

These products are all new every year?? They are a revolution!!! Razor blades, mens shirts, TVs, wiper blades, gutter guards, hearing aids... according to the ads. But also all new last year
Re: Thermostat; to drill or not to drill a bleed hole? [Re: Drew99GT] #4588906
11/29/17 02:43 PM
11/29/17 02:43 PM
Joined: Apr 2017
Posts: 1,480
Ontario, Canada
mightymousetech Offline
mightymousetech  Offline
Joined: Apr 2017
Posts: 1,480
Ontario, Canada
Return the one you bought and get an OEM.


Mighty Mouse Tech
BMW Tech, Former Acura Tech
2010 Civic Si Castrol 0W40, Redline MTL
2013 BMW 135i M Sport Edition Castrol 0W40, Redline MTL
Re: Thermostat; to drill or not to drill a bleed hole? [Re: Drew99GT] #4588909
11/29/17 02:45 PM
11/29/17 02:45 PM
Joined: Jun 2005
Posts: 5,245
North Texas
ARB1977 Offline
ARB1977  Offline
Joined: Jun 2005
Posts: 5,245
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.


2015 Tacoma 4.0L 60K (as of 02/23/18)
AMSOIL SS 0W30 / Toyota filter

2018 CRV 1.5L (as of 05/11/18)
Factory fill / Honda filter
Re: Thermostat; to drill or not to drill a bleed hole? [Re: Drew99GT] #4588913
11/29/17 02:47 PM
11/29/17 02:47 PM
Joined: Oct 2002
Posts: 22,162
Colorado Springs
Drew99GT Offline OP
Drew99GT  Offline OP
Joined: Oct 2002
Posts: 22,162
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!

Re: Thermostat; to drill or not to drill a bleed hole? [Re: Drew99GT] #4588917
11/29/17 02:50 PM
11/29/17 02:50 PM
Joined: Jan 2008
Posts: 10,694
OH
SatinSilver Offline
SatinSilver  Offline
Joined: Jan 2008
Posts: 10,694
OH
What year is the car, a 1993? smile

Re: Thermostat; to drill or not to drill a bleed hole? [Re: Drew99GT] #4588918
11/29/17 02:50 PM
11/29/17 02:50 PM
Joined: Sep 2010
Posts: 7,485
S California
OneEyeJack Offline
OneEyeJack  Offline
Joined: Sep 2010
Posts: 7,485
S California
Not having more than an opinion on the subject I'd defer to the OEM setup.

Re: Thermostat; to drill or not to drill a bleed hole? [Re: Drew99GT] #4588928
11/29/17 02:57 PM
11/29/17 02:57 PM
Joined: Jul 2005
Posts: 30,450
NY
demarpaint Offline
demarpaint  Offline
Joined: Jul 2005
Posts: 30,450
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.


God Bless Our Troops

Re: Thermostat; to drill or not to drill a bleed hole? [Re: Drew99GT] #4588936
11/29/17 03:05 PM
11/29/17 03:05 PM
Joined: Aug 2015
Posts: 2,731
NC
BigD1 Offline
BigD1  Offline
Joined: Aug 2015
Posts: 2,731
NC
Altrom Tama brand from NAPA have jiggle valves, and are made in Japan. Tama is what I used on my 92 Toyota pickup.


1992 Toyota Pickup--Formula Shell 10W-30--Fram PH3614
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