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Topic Review (Newest First)
12-07-2011 10:11 PM
Sammy91683 Ok, so I'm pretty sure that I got the good old jeep up and running again :]
-I got a brand new thermostat housing and gasket, and I sealed both sides of the gasket with water outlet sealant. I ended up having to take the belt pulley off because it was a pain to get to the lower bolt since the belt was right in the way. I also got a new lower bolt because somebody stripped the head of the old one until it was almost round.
-I got a new, fail-safe thermostat, but there wasn't a hole in the top. I broke out the drill and drilled one.
-New upper and lower hoses. The top one was swollen, warped, and I found the small hole where the coolant sprayed out of. The lower one looked like it was also ready to split open, and it was a pain to get off and on because the clamp was in such a difficult space. The hoses were still stock and my jeep is a 98. The hoses were actually older than the jeep because the manufacturing date was printed on them, and it was from October of 97.

I put everything together and filled up the system with new coolant and burped the hoses and such. I got it completely warmed up and the lower hose started leaking at the difficult clamp of course. I got under there, tightened it up, and then started the jeep back up. I took it for about a mile test-drive to get it completely warmed up and then parked it and let it idle. Only one drip that I'm very positive was a residual drip from the first time that the hose leaked. The complete test will be when I drive it to school tomorrow.
12-07-2011 07:26 AM
geiman Robertshaw Thermostat, need to drill hole? - JeepForum.com
or
thermostat possible - Page 2 - JeepForum.com

EDIT:

And someone else had a similar question:

http://www.jeepforum.com/forum/f9/wh...-hole-1298317/
12-06-2011 11:49 PM
Sammy91683 It's a $10 premium thermostat
Could someone show me a picture of where the hole would be/what it would look like? Or would it be very obvious?
12-06-2011 08:53 AM
geiman
Quote:
Originally Posted by Sammy91683 View Post
Ya. That's probably what I'm gonna do. What coolant ratio to you recommend I use. The coldest that it would ever possibly get here is about 15 at night. The lowest we usually get is about 19 once or twice every winter. I have a full gallon of antifreeze and about a 3.4 gallon system. All day at work yesterday and all day at school today, all I can think about is working on the jeep and getting it fixed haha.
50/50 is what's recommended, no? Someone correct me please if I'm wrong.

Quote:
Originally Posted by C.L. View Post
I haven't seen it mentioned yet, but if you have a high quality thermostat, it probably has a "burp hole" in it to help keep air pockets out of the block. If you see a small hole in the diaphragm of the thermostat, near the outer rim, make sure it's installed with the hole on the TOP. it won't do any good on the bottom.
Good point, and if your thermostat doesn't have a hole in it you can drill one.
12-06-2011 08:51 AM
C.L. I haven't seen it mentioned yet, but if you have a high quality thermostat, it probably has a "burp hole" in it to help keep air pockets out of the block. If you see a small hole in the diaphragm of the thermostat, near the outer rim, make sure it's installed with the hole on the TOP. it won't do any good on the bottom.
12-06-2011 08:43 AM
Sammy91683 Ya. That's probably what I'm gonna do. What coolant ratio to you recommend I use. The coldest that it would ever possibly get here is about 15 at night. The lowest we usually get is about 19 once or twice every winter. I have a full gallon of antifreeze and about a 3.4 gallon system. All day at work yesterday and all day at school today, all I can think about is working on the jeep and getting it fixed haha.
12-06-2011 08:39 AM
geiman Doesn't matter; they both do the same job, but draining the radiator through it's valve is the slower/cleaner way of doing it. Detaching the lower hose without draining the radiator won't hurt anything, just be ready to catch the torrent of coolant.

I usually open the valve and let it drain as I remove other hoses, etc..
12-06-2011 08:39 AM
Sammy91683 And ya. The guy at the parts store specifically told me that I didn't want to put any silicone on it.
It's one of those weird fiberglass-looking gaskets. Not a rubber ring.
12-06-2011 08:36 AM
Sammy91683 Ok. Thank you.
Should I let the radiator drain before I detach the lower hose?
12-06-2011 07:59 AM
geiman x2, that valve is definitely not factory. Be glad you don't have it; just one more thing to get old, brittle, and eventually fail. Follow the rest of Shelby427's instructions and you should be good to go.

And RTV isn't necessary for replacing the thermostat either. Using the gasket by itself is perfectly fine, and much easier.
12-06-2011 07:50 AM
Sammy91683 Thank you so much.
This has been super helpful
12-06-2011 07:39 AM
Shelby427 Umm that valve you are talking about is NOT factory. It appears to be one of those Prestone flush kits someone has installed.

Sammy, while you have it apart, it would be a wise thing to back flush the heater core.

Simple enough to do, pop the two hoses that run from the firewall on the passenger side, off of the engine block. (loosen clamps and pull em off) Use a garden hose to run water through both hoses, one at a time, till the water runs clean. This will flush all the debris out of the core and let it work better.


As for the rad hoses, nothing to it. Match your new to the old ones, use new clamps.

You already got the good advice on the thermostat so I'll bypass that part, same with using a catch pan when you pull the lower hose.


All done, fill with coolant and leave the rad cap off. Start the jeep and let it run.
Watch the coolant in the top of the radiator. It will slowly rise a couple of times as the coolant heats up (yes some will run out the top), then all of a sudden it will drop out of sight. That's the sign the thermostat has opened. Slowly add coolant to the rad till it's nearly full. Install the rad cap and fill the overflow jug to the full mark.

Drive it and keep an eye on the fluid level. Top off the reservoir as needed.

Oh almost forgot, if you park the jeep on a slight incline, front higher, it helps the air pockets bleed out faster as you fill the coolant back up.


p.s. clean up any/all spilled antifreeze, one drop of antifreeze is all it takes to sicken or kill a dog/cat/child if they ingest it.
12-06-2011 01:44 AM
darkproximity i dunno if the chiltons will explain all that, i just swapped in a new motor.. i'm not going to risk overheating..
12-06-2011 01:42 AM
darkproximity uhh well if you're doing your lower radiator hose too.. you're gonna want a bucket to catch the coolant that will come out too.. else get more coolant lol.. the 4L is a 3.5 gallon cooling system iirc..

and yes, google images FTW


even has an arrow pointing to it and everything!
12-06-2011 01:38 AM
Sammy91683 Ok
Hopefully the chilton explains that all.
Is that the only special thing I have to do for the upper and lower hose replacement?
Did you find a picture?
12-06-2011 01:37 AM
darkproximity
Quote:
Originally Posted by ClayL View Post
whatever man, i have my 240SX, which is about as much good in the snow as a lame horse at the Kentucky derby
same friend of mine used to have a 240sx with super hicas..
12-06-2011 01:36 AM
darkproximity
Quote:
Originally Posted by Sammy91683 View Post
Ok cool thanks.
I have a chilton, so that'll help me out
Is this necessary to do, or just helpful?
I'd say its necessary.. you dont want an air pocket in the cooling system, especially in the head.. the cooling system is pressurized so the air cant escape.. and if you imagine the water pump will take a while to get coolant up into the head, which will trap the air in the head until the thermostat opens at 180*.. you'll also run the radiator low of coolant..
12-06-2011 01:32 AM
ClayL
Quote:
Originally Posted by darkproximity View Post
460 man.. lol
whatever man, i have my 240SX, which is about as much good in the snow as a lame horse at the Kentucky derby
12-06-2011 01:30 AM
darkproximity
Quote:
Originally Posted by ClayL View Post
460 man.. lol
12-06-2011 01:30 AM
Sammy91683 Ok cool thanks.
I have a chilton, so that'll help me out
Is this necessary to do, or just helpful?
12-06-2011 01:29 AM
darkproximity lemme see if i cant find a pic..
12-06-2011 01:28 AM
Sammy91683
Quote:
Originally Posted by ClayL
i know what you mean, but im driving my GF's aveo, talk about awkward
Ahahaha! All I can say is, I'm really sorry
12-06-2011 01:28 AM
ClayL
Quote:
Originally Posted by darkproximity View Post
My friend let me borrow his 88 F250 with a 460 I didnt feel any less manly hahah
12-06-2011 01:27 AM
Sammy91683 What does the breather valve look like?
12-06-2011 01:27 AM
darkproximity
Quote:
Originally Posted by ClayL View Post
thankfully i didnt have that happen when i had cooling problems, had to replace the entire cooling system


i know what you mean, but im driving my GF's aveo, talk about awkward
My friend let me borrow his 88 F250 with a 460 I didnt feel any less manly hahah
12-06-2011 01:25 AM
darkproximity When you connect all the hoses back up, connect the upper radiator hose to the thermostat housing first.. dont connect it to the radiator yet... one of the heater hoses that goes from that housing to the firewall should have a breather valve on it.. unscrew it.. go back to the upper radiator hose and start pouring coolant into it slowly, it will start going into the head.. having that breather valve will allow the coolant to flow in faster (it will still be pretty slow though as it has to flow past the thermostat).. keep an eye on that breather valve until you can see coolant about to come out, or coming out.. stop pouring and put the cap back on the valve.. this should fill the head up for the most part.. now put coolant in the radiator until that seems full.. put the rest if any in the overflow container.. check it in a few days to make sure you arent low
12-06-2011 01:23 AM
ClayL
Quote:
Originally Posted by darkproximity View Post
Hey it just happened to my old motor lol hence the motor swap
I like helping people
thankfully i didnt have that happen when i had cooling problems, had to replace the entire cooling system
Quote:
Originally Posted by Sammy91683 View Post
Ya, I know. I'm borrowing my grandpa's truck and whenever I see jeeps, I instinctively do the jeep wave, but then I just feel like an idiot and miss my jeep XD
i know what you mean, but im driving my GF's aveo, talk about awkward
12-06-2011 01:20 AM
Sammy91683 Ya, I know. I'm borrowing my grandpa's truck and whenever I see jeeps, I instinctively do the jeep wave, but then I just feel like an idiot and miss my jeep XD
12-06-2011 01:19 AM
Sammy91683 Ya, the guy gave me a gasket piece when I bought the thermostat. Ok. I'll go to Ace tomorrow after school to get it. It was the upper right where the clamp is where it goes into the water pump. I didn't get a chance to see the crack itself, because it seemed to have been towards the bottom of the hose, but like I said, the hose was all swollen and you could trace the spatter all the way back to the part of the hose. The spray made it all the way across the underside of my hood though. Have to give it some props haha.
12-06-2011 01:18 AM
darkproximity Hey it just happened to my old motor lol hence the motor swap
I like helping people
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