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Old 05-04-2011, 02:26 PM   #1
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Thermostat delete...pros cons?

Is it ok to just remove the thermostat all together? It never drops below 55 degrees over here and it gets up to 125 in the summer. What are the pros and cons?

This forum has already helped me a lot. Thanks

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Old 05-04-2011, 02:29 PM   #2
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The thermostat helps it warm up faster. and the faster it warms up, the quicker it reaches its peak opperating point.

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Old 05-04-2011, 02:40 PM   #3
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I think it may have effects on your combustion. If your YJ is fuel injected, it will take readings of temp. in relation to fuel consumption and spark for the computer to get the fuel to air ratio correct...and it will change your fuel mileage. Just from what I've read. On older vehicles, carb. engines without CPU, there is no problem. Done it on my CJ before the new radiator. Maybe someone else will chime in with more knowledge on the matter. Just passing what I have found.
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Old 05-04-2011, 02:42 PM   #4
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Quote:
Originally Posted by Peepers
The thermostat helps it warm up faster. and the faster it warms up, the quicker it reaches its peak opperating point.
True. I guess I am just afraid that it will get stuck closed in the most inopportune time
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Old 05-04-2011, 02:44 PM   #5
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Put in a new one...takes maybe 20 minutes. Most of the time used is cleaning the old gasket material off the housing and inlet on the engine.
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Old 05-04-2011, 02:46 PM   #6
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Quote:
Originally Posted by Tarby
I think it may have effects on your combustion. If your YJ is fuel injected, it will take readings of temp. in relation to fuel consumption and spark for the computer to get the fuel to air ratio correct...and it will change your fuel mileage. Just from what I've read. On older vehicles, carb. engines without CPU, there is no problem. Done it on my CJ before the new radiator. Maybe someone else will chime in with more knowledge on the matter. Just passing what I have found.
Thanks! If that's how it works then I understand why it would need to stay in
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Old 05-04-2011, 02:47 PM   #7
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You will burn more fuel and cause more engine wear because it never has the chance to warm up. Not as much wear involved with fuel injected engines, but I wouldn't. If you lived where it was 100+ degrees year round, maybe, but even then it's not recommended for whatever you would be gaining. If you're overly concerned, keep a spare with you and the tools to change it if needed. It's easy enough to do.

It's surprising how much a thermostat helps.
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Old 05-04-2011, 02:57 PM   #8
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Originally Posted by Mischievous Cat
You will burn more fuel and cause more engine wear because it never has the chance to warm up. Not as much wear involved with fuel injected engines, but I wouldn't. If you lived where it was 100+ degrees year round, maybe, but even then it's not recommended for whatever you would be gaining. If you're overly concerned, keep a spare with you and the tools to change it if needed. It's easy enough to do.

It's surprising how much a thermostat helps.
And just like that I am swayed. Thanks for the quick replies
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Old 05-05-2011, 01:14 AM   #9
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the thermostats job is to maintain a miminum operating temperature so should always be installed
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Old 05-05-2011, 08:50 AM   #10
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if u are that worried about it getting stuck closed stant does make a fail safe thermostat..
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Old 05-05-2011, 09:13 AM   #11
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I wouldn't remove the theromostat all together, it will never get up to temp as the coolant is constantly flowing. Regardless of fuel injection or carb, both will be hurt. Fuel injection has sensors to know when the engine is up to temp, if it doesn't get up to temp, then it will stay in closed loop, which burns more fuel and doesn't run as well. if it's Carb'd, the choke will stay on longer than neccessary or on always depending on the choke setup. I know a few people online run a "washer" setup that they size themselves to keep the coolant flowing constantly, but restricted of course. This is on their pre-runner trucks though that are abused in the desert. As stated they do make fail-safe thermostats.
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Old 05-05-2011, 11:24 AM   #12
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well, it has a hard time reaching operating temp in cool weather but also can run over temp in hot weather also. the coolant runs so quickly through the radiator that it doesn't get a chance to release its heat all the way sometimes. the part that moves in the thermostat is smaller then your passage way and the flow is kept at a certain amount, even when the thermostat is fully open. you might see higher running temps under certain conditions so just keep an eye on the temp gauge and you'll be good
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Old 05-06-2011, 03:18 AM   #13
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Quote:
Originally Posted by busemans
well, it has a hard time reaching operating temp in cool weather but also can run over temp in hot weather also. the coolant runs so quickly through the radiator that it doesn't get a chance to release its heat all the way sometimes. the part that moves in the thermostat is smaller then your passage way and the flow is kept at a certain amount, even when the thermostat is fully open. you might see higher running temps under certain conditions so just keep an eye on the temp gauge and you'll be good
This explanation is pretty good and goes with everything else that I have researched. Thank you for putting time in to help a new Jeeper
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Old 05-06-2011, 11:18 AM   #14
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no problem man. we were all there at one time. shoot, i still feel like a new guy and i've been working on vehicles for almost 20 years.
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Old 05-07-2011, 06:35 AM   #15
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buseman is spot on. It can overheat without a thermostat or washer or something to slow the coolant down.
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Old 05-07-2011, 08:03 AM   #16
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Quote:
Originally Posted by Tarby
I think it may have effects on your combustion. If your YJ is fuel injected, it will take readings of temp. in relation to fuel consumption and spark for the computer to get the fuel to air ratio correct...and it will change your fuel mileage.
Thermostat doesn't take temp readings, it only modulates the coolant flow to the radiator. There is a separate temperature sensor that fulfills that function.

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