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Old 09-04-2012, 04:07 PM
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Thermostat/coolant issue

A little back ground-
So I got a code couple weeks ago p1281(i believe) but looking it up it said my thermostat was open and not shutting. (whatever that meant). Am not a mechanic and never claim to be one but before I take my car to a shop, I first try and find out if it's a DIY. So i got a new thermostat from Autozone and a gasket. I located it on my engine, disconnected the hoses, drained coolant and got the the thermo housing out. I took out the old one and I had to used a flat screw driverand some scotch brite to get the "stuck" old gasket from the rim of the thermo housing. I put in the new gasket and placed the new thermostat in and bolted them back on. Replaced the hoses and added fresh coolant. Started the car and damn thing is leaking. Opened it up again to try and get it in straight but still leaks.
Question-
Is there a putty like substance or a liquid that dries that can be put on the rim of the thermo housing or gasket to 1st. Hold them in place as I try to bolt them back in coz I had a hard time trying to keep them from slipping as I squeeze in the tight space. 2nd to help get a tight seal once they are bolted back on? or did I mess the housing as i scrapped away the old gasket. oh and finally is there a specific position that the thermostat should be placed, this goes back to the slipping as i try to place it back in place on the engine.
Thanks.
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Old 09-04-2012, 05:37 PM
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Re: Thermostat/coolant issue

Not sure about the 4.0, but on the 4.7 it only fits in one position. The small valve should point upwards, so trapped air can leak away. When i changed mine, i found that the new seal which came with the thermostat was bigger then the old one and the housing would not close completely. Ended up using the old seal and it was ok.
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Old 09-04-2012, 06:17 PM
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Re: Thermostat/coolant issue

Came across this as i sue the search button, from sometime 2011.

Quote:
Originally Posted by jeffs2014 View Post
sorry about the delay. it only gets to 200 when its sitting for awhile. as soon as i drive temp drops. i hate doing the termostat. i have to double up the gasket or the housing wil slowly drip so it a pain for me to do. i was hoping i didnt have to chnage that again. i went to oreillys and the guy told me to never but that fail safe theromstat again which was 16 bucks so i went this morning n bought a cheapy for 3 bucks. which me luck and thanks alot for the help.
I think ima try and double up too.

Thanks Frank I was stupid enough to take out the old thermostat without looking at it's positioning. Good learning experience for next time.
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Old 09-15-2012, 05:14 PM
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Also could be manufacturer too. I got a stant in my rebuild kit and threw it away as it was mm smaller then OEM ....

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Old 09-25-2012, 12:08 PM
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Re: Thermostat/coolant issue

So I doubled up on the gasket and that took care of the issue of the leak. Now I have other issues first it threw some codes, will check 'em and post them later but it's something to do with engine not warming up. So when I start the car, it never warms up to the 210 number. Am guessing it may have something to do with the sensor that is by the T-Stat housing. Am gonna change that one and see if that works. Also I read there is another sensor that is to with the cooling but I cannot seem to locate that one. Any ideas where it may be located.
I also have a leak on either the lowere hose of may radiator or the radiator itself. Weird thing is the leak occurs when the coolant reservior is filled with the 50/50 coolant but when I put just water in there, there is no leaks at bottom of radiator.
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Old 09-25-2012, 01:56 PM
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Re: Thermostat/coolant issue

Engine not warming up is normally due to a stuck open thermostat.
Now you have changed that one already, so it would be a good idea to change the coolant temperature sensor, which is indeed mounted on the thermostat housing.
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Old 10-04-2012, 02:38 PM
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Re: Thermostat/coolant issue

Damn this P1281 code is persistent. So what would happen if I removed the T-Stat and left it out? A friend was suggesting it and his reasoning was nothing would go wrong only that there will be a higher supply/ flow of coolant and it would not damage anything. Is that true?
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Old 10-05-2012, 04:00 PM
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Re: Thermostat/coolant issue

Eliminating the thermostat will cause the warm up time of the car to increase. This will cause the cel lite to come on. If your car is not warming up put a new tstat in it again. The sensor may be bad also, Try a new tstat first. its cheaper. The winter is comming, Your car will never warm up without a thermostat.
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Old 10-11-2012, 10:50 AM
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Re: Thermostat/coolant issue

Quote:
Originally Posted by paulschott View Post
Eliminating the thermostat will cause the warm up time of the car to increase. This will cause the cel lite to come on. If your car is not warming up put a new tstat in it again. The sensor may be bad also, Try a new tstat first. its cheaper. The winter is comming, Your car will never warm up without a thermostat.
Winter who?? I never heard of him. (Cali baby) ** I had to**

Took her in for an oil change, (happens if you are in an apartment and have nowhere to "work" read garage) and they told me 1. I have a leaking oil gasket ($150 to fix it) 2. I have a "bad" tranny pan valve ($250 to fix). I havent really looked much into it....yet.... but would it cost that much for the above. And could this also be a reason why I keep getting the P1281 code, just coz I have changed the t-stat and gasket twice already and the sensor, I higly dont think they are the problem but then again if above faults are fixed and still have issues, then I may consider re-doing them. Also have an issue with the radiator bottom hose area leaking coolant, may be the hose or the radiator itself.
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Old 10-14-2012, 07:41 PM
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Re: Thermostat/coolant issue

Old veteran with 4.0's here. Just finished a rebuild yesterday.

First the 4.O thermo housing is usually not a problem to seal up. A TINY amount of black rtv on both sides of the gasket will do it in a difficult situation. Second you have to have a Tstat in there. Get a 190 and put it in so the "pyramid" on it sits horizontal so when you look down in there it looks like a "V" pointing at you. Snug it up, fill it up, make sure there aren't any air bubbles trapped in the system and smile. Air causes problems with temperature. There is a post on JU with the procedure for getting air out.--essentially, park up hill on a STEEP grade (Lombard street) remove the radiator cap, let engine get to full temp and all air bubbles will work themselves out.
If your code persists, reset the pcm (remove - battery terminal for a minute or so). If that fails get a new sensor.
Regarding your gaskets. The "oil gasket" is likely your valve cover gasket. If you can do a Tstat you can change it. Save about $120. The "tranny pan valve" doesn't exist unless someone put a drain plug in the pan. Suggestion: Don't go there again unless you are low on blinker fluid. They are just about criminal.
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Old 10-15-2012, 03:13 PM
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Re: Thermostat/coolant issue

Quote:
Originally Posted by wkxj View Post
Old veteran with 4.0's here. Just finished a rebuild yesterday.

First the 4.O thermo housing is usually not a problem to seal up. A TINY amount of black rtv on both sides of the gasket will do it in a difficult situation. Second you have to have a Tstat in there. Get a 190 and put it in so the "pyramid" on it sits horizontal so when you look down in there it looks like a "V" pointing at you. Snug it up, fill it up, make sure there aren't any air bubbles trapped in the system and smile. Air causes problems with temperature. There is a post on JU with the procedure for getting air out.--essentially, park up hill on a STEEP grade (Lombard street) remove the radiator cap, let engine get to full temp and all air bubbles will work themselves out.
If your code persists, reset the pcm (remove - battery terminal for a minute or so). If that fails get a new sensor.
Regarding your gaskets. The "oil gasket" is likely your valve cover gasket. If you can do a Tstat you can change it. Save about $120. The "tranny pan valve" doesn't exist unless someone put a drain plug in the pan. Suggestion: Don't go there again unless you are low on blinker fluid. They are just about criminal.
Thanks for the pointers. I will check the paperwork they gave back after the oil change with the "mechanics comments" stating about oil and tranny fluid leaks.
I didn't have the $ to pay someone to do it and living in apartments has its limitations with fluid changes so couldn't do it immediately,I did a little cosmetic work on the WJ and will handle the REAL issues later...
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