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Old 02-20-2012, 08:02 PM   #1
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no tstat

Would it cause any damage?

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Old 02-20-2012, 08:12 PM   #2
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If you mean by tstat- thermostat, The Jeep can run fine without a thermostat, it will not overheat because of the missing thermostat. The only problem you will have is in the winter months, it will take a lot longer for your engine to heat up to operating temperature. This means that you will burn more gas (because the engine will call for a richer mixture until it gets warmed up) and you may find your heater will take longer to actually put out any heat, and it may not be as hot as normal.

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Old 02-20-2012, 08:17 PM   #3
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Oh ok cus I replaced it and it wasn't letting the coolant flow through, so I'm running it with out it, just wanted to make sure nothing happend to it until I put a new one.
Thank you Sr.
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Old 02-20-2012, 08:50 PM   #4
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your mileage is going to go to s**t cause your engine isn't going to get hot enough to vaporize the fuel correctly.....but it won't cause any mechanical harm....
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Old 02-21-2012, 07:01 AM   #5
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It won't hurt it but it's made to run the most efficient with it. The computer senses the engine temp and adjusts accordingly. If you put in a new thermostat it should be fine, allowing the coolant to flow through. The only way that wouldn't happen is if it was defective or installed upside down. You really should run with it. Most run a 195 thermostat but it depends on the year, engine, etc. It can be easily looked up.
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Old 02-21-2012, 07:22 AM   #6
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bypass

In some of the older cars there was an inline valve in the heater hose. That would shut off the coolant flow to the heater so you didn't get the hot air inside in the summer.

The trouble was that if it was shut, and the thermostat was closed, then the water pump didn't have anyplace to discharge to. So, they created a bypass hose that allowed some water to get to the radiator while both thermostat and heater were closed.

On the Jeep there is no valve in the heater hose. The water flows through the heater all the time. Therefore, when the thermostat is closed the water pump isn't blocked. It can flow coolant through the heater core.

Due to that, you don't need a bypass for the thermostat and it can be totally blocked and still have coolant flow through the pump. ALso means you can't just block off the heater hose, you have to at least put in a bypass hose that goes from the heater outlet to the inlet. There does need to be a weep hole so that water can flow a tiny bit in order to get the hot water around the sensor and make it open.

Of course, if the thermostat fails closed you won't have any cooling, except the heater core.
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Old 02-21-2012, 07:27 AM   #7
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Ran without one in a CJ during the winter for about a month or two. No problems other than being very cold inside the jeep. Jeep of course ran very cool temps during that time.
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Old 02-21-2012, 08:44 AM   #8
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Quote:
Originally Posted by kik View Post
It won't hurt it but it's made to run the most efficient with it. The computer senses the engine temp and adjusts accordingly. If you put in a new thermostat it should be fine, allowing the coolant to flow through. The only way that wouldn't happen is if it was defective or installed upside down. You really should run with it. Most run a 195 thermostat but it depends on the year, engine, etc. It can be easily looked up.

every thing in an engine is set up to run right with a thremo.

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