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94 jeep wrangle cooling problem
03-12-2008, 09:33 PM
Post: #11
RE: 94 jeep wrangle cooling problem
If you can get it to level ground or even a bit higher on the front that would be best.

Running "rough" is pretty subjective. A 4 banger will not be as smooth as a V8 bit it should not skip, cough, or shake from the point of the driver's seat. A slight visable vibration while looking at the engine is normal.

Internal leakage does not always cause a skip but it will eventually show up when "reading" spark plugs or as a very clean piston if you can see into the cylinder while the plugs are out. The top of the piston will be bare metal instead of the usual black carbon.

Rupe
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03-13-2008, 09:33 PM
Post: #12
RE: 94 jeep wrangle cooling problem
ok, leveled vehicle out and took out the t-stat. This time I decided to add water through the top radiator hose down into the block and fill the radiator up this way. It worked fine, vehicle did not over heat and it ran somewhere around 160-180. So I guess it was probably air in the system. Now my next question is if I replace the t-stat and refill the the vehicle with coolant through the radiator am I going to have the same problem?
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03-13-2008, 11:44 PM
Post: #13
RE: 94 jeep wrangle cooling problem
The slope of your driveway may be the source of your issues.

What I would do is check that t-stat in a pan of boiling water to see when it opens. Use a thermometer to verify. If it checks ok then put it back in. If not then get a replacement.

When filling the system with antifreeze you should remove a heater hose at the highest point on the firewall end and stick it back on when the new coolant comes out. Fill the radiator to the brim while the engine runs and then install the radiator cap. (fill the over flow tank to the max line also) Over the next 2 hot / cold cycles the coolant level should even off mid way in the tank and all should be well in Kansas!

Rupe
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03-15-2008, 08:14 AM
Post: #14
RE: 94 jeep wrangle cooling problem
ok, well, I'm still having the same problem. I must be doing something wrong when I put the T-stat back in. It just continues to get warmer until it reaches hot without the t-stat opening up. water in radiator is cold. I noticed in your last post where you said remove the heater hose at the highest point. If i do this do you think it will get rid of the air bubble inside? I have not tried this, read your post after replacing the t-stat. Thanks again for all of your advice, alest I've learned a few things because of this.
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03-15-2008, 09:48 AM (This post was last modified: 03-15-2008 09:53 AM by Rupe.)
Post: #15
RE: 94 jeep wrangle cooling problem
You did check that t-stat in a pan of water on the stove with a thermometer to see when it opens, right? This would ensure that it's not damaged and it's working properly.

The t-stat is in correctly? Usually the spring and the temp markings face toward the engine.

If the t-stat is not symetric (off center type) make sure it's not hitting anything when installed. Look in the hole to be sure there is clearance and twist it one way or the other if necessary.

Lastly, make sure there is no air in the system and if the t-stat has a bleeder hole that should be facing the high point. Remove the highest heater hose when filling to get the air out and if you are not sure if the heater is filled you can pour some coolant into that as well.

Run the engine up to temp at fast idle with the heater controls set to hot. If the heater discharges hot air then you know it's circulating and not air bound.

Rupe
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