Still Overheating ?

[95Dsm22]

I have changed the temp sensor the one behind thermostat , the fan comes on when it's supposed to don't remember the temperature tho . When the car starts to over heat the upper radiator hose is hot . So it can either be the radiator plugged up or i'dk? I just changed the radiator cap and I had put a brand new multi layer headgasket .

 

[95Dsm22]

In a separate post you stated the car was running rich and overheating after a couple of miles and the fans were coming on at 170. You replaced a ect sensor with one that oreilly sold you and it didn't look like yours so you cut it out and installed the one they gave you. Are you sure you bought the correct 1. Because in the same post your aware there is more than one ect sensor

Yea I replaced the coolant temp on the thermostat housing . The top one was on the car but I put the one on the bottom .

 

[jakk220]

Are you sure you have a proper mix of coolant and water? If the mixture is incorrect it may explain the issues you're having. I have seen it happen before.

"With an improper mixture of antifreeze and water, the boiling point of the coolant will be changed. This simply means that the signals sent by the temperature sensor may be altered and cause a change in the calibration of the computer's output programmed control signals. A higher level of emissions is one result."

http://www.marinemechanic.com/site/page39.html

 

[95Dsm22]

Are you sure you have a proper mix of coolant and water? If the mixture is incorrect it may explain the issues you're having. I have seen it happen before.

"With an improper mixture of antifreeze and water, the boiling point of the coolant will be changed. This simply means that the signals sent by the temperature sensor may be altered and cause a change in the calibration of the computer's output programmed control signals. A higher level of emissions is one result."

http://www.marinemechanic.com/site/page39.html

I run a 50/50 green coolant and the area I'm in the weather varies from 70 -90°f

 

[jakk220]

Just checking the basics. Do you have heat in the car when it starts overheating? And have you pressure tested the coolant system yet?

 

[95Dsm22]

Just checking the basics. Do you have heat in the car when it starts overheating? And have you pressure tested the coolant system yet?

Yea I turned the heater on at it has heat and I pressure tested it and it had like minor leaks from the hoses so I tightened the clamps up and it still is overheating but no leaks . I drove around and got my gauge to the red and on ecm link it was reading like 175 180 . Which could be wrong

 

[jakk220]

Hmmm. Even though the sensor is new I would try another just to make sure its not a faulty one. Other than that I wonder if maybe the ECU is translating the signal improperly maybe pointing at a faulty ECU? Perhaps wiring for the sensor?

 

[jakk220]

Also even the smallest leak could be letting air in and still not be letting water out. It could then be sucking in air to the system. If you take the radiator cap off when the engine is cold do you see bubbles?

 

[95Dsm22]

Also even the smallest leak could be letting air in and still not be letting water out. It could then be sucking in air to the system. If you take the radiator cap off when the engine is cold do you see bubbles?

ok I'm gonna pressure test it also my gauge be bad if on ECM link I am reading around 180 when my temp gauge is on hot

 

[95Dsm22]

Or the temp gauge sender by the temp sensor

ok I'm gonna pressure test it also my gauge be bad if on ECM link I am reading around 180 when my temp gauge is on hot

 

[1990TSIAWDTALON]

I run 206*. 165 is not even warmed up but if you are boiling coolant something is amiss. I am not even at 2/3rds on my temp gauge when I am at 206* in Link.

 

[SasaniFab]

Im confused, did you test for combustion gases in your radiator? if the waterpump is good and the system isnt leaking you shouldnt be overheating. Your gunna be going around in circles until you know for sure you dont have a cracked head or leaking headgasket.

 

[jakk220]

I believe a leak down test is in order. The bubbles you're seeing could be exhaust gases. Do a leak down test with the radiator cap off and look for bubbles. If there is you have a bad head gasket. That combined with a faulty gauge could be your issue. This is why I also said look for bubbles on a cold start.

 

[C'LO]

The could have a warped head or block thus not necessarily boiling but just combustion gases going through the cooling system

 

[nek]

I havent checked the dsm forums since I lost my talon but I think everyone is forgetting that the dsm has 2 temp sensors. The ECU reads off the lower sensor after the rad. The gauge reads off the sensor before the radiator. If both sensors are reading correctly (obviously a sensor could be bad) then that means the fluid before the radiator is way hotter then the fluid after the radiator.
In most cases, even when the ecu reads ~190-205, I believe the gauge cluster showed the temp at ~1/2. So his coolant before the radiator is much hotter then after, I would think this would be caused from lack of flow. Whether its from the water pump. stuck thermostat, or clog in the radiator is unknown.
If the headgasket is the issue, you will either,
1 leak fluid
2 combine oil and coolant
3 push coolant out of your radiator cap from compression in your cylinders..is your overflow filling up? When the engine is cool, is your coolant system still full?

If I memory serves me correctly, I would focus on what you know, and you know that one sensor is reading much hotter than the other which leads me to believe something is causing your fluid not to flow (blockage or no circulation)

 

[jakk220]

. The ECU reads off the lower sensor after the rad. The gauge reads off the sensor before the radiator. If both sensors are reading correctly (obviously a sensor could be bad) then that means the fluid before the radiator is way hotter then the fluid after the radiator.
In most cases, even when the ecu reads ~190-205, I believe the gauge cluster showed the temp at ~1/2. So his coolant before the radiator is much hotter then after, I would think this would be caused from lack of flow. Whether its from the water pump. stuck thermostat, or clog in the radiator is unknown.

This would still cause him to push coolant.

 

[OGDSM1989]

Welll after reading this cluster of a mess ........ In the very begging the OP stated he changed to a MLS head gasket. If we assume ( which we all know what happens to those that ass u me things ) that the head gasket is sealed .....I am guessing that the coolant system may need a good burping, since trapped air can really cause some weird coolant issue's. At the least I would start over with filling full of coolant " burping " etc etc .... I am still wondering if you have some type of logging device / how your seeing what the ecu is reading on coolant temp.

 

[jakk220]

I just put on an MLS headgaket about 2 months ago too. You'll never guess what I'm in the middle of replacing right now .... : / I'll be convinced that its sealed when i hear of some leak down results.

 

[OGDSM1989]

I just put on an MLS headgaket about 2 months ago too. You'll never guess what I'm in the middle of replacing right now .... : / I'll be convinced that its sealed when i hear of some leak down results.

..I am always surprised when I hear a street motor ( even mild track motors ) that are using MLS head gaskets. To each is their own .. your right a leak down test would help eliminate a couple if's and maybe's ...

 

[jakk220]

The only reason I made the switch was because I had a felpro on there and it was pushing coolant after about 10k miles. Now im having the same issues with the MLS. Sigh.