Very odd overheating

[cmoody2006]

Yours sounds like it could possibly be the head gasket. You may have warped your head when you overheated it like i did. Do a compression test on your cylinders and find out if any are out of whack. That will give you a good clue as to which cylinder it could possibly have a leak in it. My 240 did the same types of things before i changed the head gasket. I had to have my head milled down and I had to use a head gasket spacer.... Thats where my problem is..... The head gasket spacer isn't completely sealed to the block so its letting in some coolant into the cylinder walls. Plus i think I need to go get a new head gasket I think I messed mine up when I pulled it off for the second time.

[Optical_Sensor_Array]

Wow, same exact issue here!Here's my story:

A little while ago my car was in a minor collision, and the radiator fan was left pinned against the radiator. Since then, the fan would spin, but of course drag against the radiator.Out of the blue, sometime last week, it broke through, and coolant was being sloshed around my entire engine bay. Smoke everywhere.So naturally I drove it around for a few days back and forth to work, and yes, it got very hot, and actually shut itself off after I had pulled over on the highway (there was smoke coming out from the side of the engine).I just replaced the radiator yesterday, and im having the same exact issue.

My question is WTF?

[cmoody2006]

Heres what happened to your motor most likely

You ran it without coolant in it and either warped the head/block and blew the head gasket you will either have to find a new head/block but to find out what happened to it you will have to take the head off and take it to a machine shop and have them check for warpage. Then you will have to check your block to see if it is flat and not warped. once you do that and everything checks out you can just order a new head gasket and ARP head bolts and just put it all backtogether. But thats if you didn't warp your head. If you warped the head you will have to have the machine shop mill the head down and hopefully they can fix it. If they say they can't tell them that you have heard of people using a head gasket spacer and see what they say.

[Optical_Sensor_Array]

Thanks for your help man, in the meantime ive done what the other guy said and jack my car up to let the air out of the rad cap and the bleeder bolt.

So far so good

[jfunez]

hey guys, i had the same issue when i replaced my water pump and thermostat...try drilling a very small hole on the thermostat...be carefull if you drill more than one or too big it will take a little longer to warm up in a freezing morning......istall the thermostat back on and problem solved....

[stocker240]

well i think i have escaped any major probs , since my first post i have gone on 4, 30 min trips checked the coolant level upon leaving and return as well as the temp at the gauge and the heater temp blowing inside the car everything is perfect , however the lower rad hose and the lower 70 of the rad is cold , thats the only part im still not convinced is normal,As far as my head being warped i think it has occured only in my human form -- i ran the car with the rad cap off and didnt see any bubbles - i havent lost any coolant in the last 2 days- and my exhaust dosent smell sweet or like coolant , oil looks good as well, ill give it a week and see how it goes

thanks

[Optical_Sensor_Array]

I took my thermostat out to troubleshoot, its a ***** not having heat in -10 degree weather but at least my engine doesent overheat (in fact its cool to the touch after an hour drive to work)

Once its warm enough ill put the new one in.

[vancouverbc]

most reputable parts places will sell you a stat with a jiggle valve.[QUOTE=jfunez]hey guys, i had the same issue when i replaced my water pump and thermostat...try drilling a very small hole on the thermostat...be carefull if you drill more than one or too big it will take a little longer to warm up in a freezing morning......istall the thermostat back on and problem solved....[/QUOTE]

[vancouverbc]

lower hose obviously should be cool it is cooled h2o leaving rad. my rad is cold except very top. i dont know exactlyhow the water flows through the rad so cant say how hot the rad should feel at various places
Modified by vancouverbc at 7:43 PM 2/11/2008

[stocker240]

well that makes me feel better , i was hoping someone else wold feel their lower rad hoses and comment on this for me , i called morrey nissan in Burnaby as well as meadow nissan in pitt meadows both of thier service tech's said that the lower hose should be warm , maybe not as hot as the upper but it definately shouldnt be cold and when i said that the rad was cold Morrey nissan said it was probably blocked - i did'nt buy it and since friday night when this all went down my car has been perfect

woot woot , thanks vancouver Bc

Josh

[vancouverbc]

cold outlet could mean blocked rad but it could also mean the rad is very efficient.

well that makes me feel better , i was hoping someone else wold feel their lower rad hoses and comment on this for me , i called morrey nissan in Burnaby as well as meadow nissan in pitt meadows both of thier service tech's said that the lower hose should be warm , maybe not as hot as the upper but it definately shouldnt be cold and when i said that the rad was cold Morrey nissan said it was probably blocked - i did'nt buy it and since friday night when this all went down my car has been perfect

woot woot , thanks vancouver Bc

Josh

[uvamosk]

Ok. I been trying to kinda figure this out and its my fault for not knowing this by now.

Does the top rad hose flow engine to rad?

and the bottom hose flow Rad to engine?

I have my Greddy Temp gauge installed on my bottom house of my rad. It will ready from 55c to 90c.....

Which is ok i would think. But if thats 90c going into the engine that O_O I have problems...!

[vancouverbc]

hot coolant from engine flows to top of rad and works its way down to bottom and leaves bottom hose and goes back to engine

.

Ok. I been trying to kinda figure this out and its my fault for not knowing this by now.

Does the top rad hose flow engine to rad?

and the bottom hose flow Rad to engine?

I have my Greddy Temp gauge installed on my bottom house of my rad. It will ready from 55c to 90c.....

Which is ok i would think. But if thats 90c going into the engine that O_O I have problems...!

ho
Modified by vancouverbc at 1:09 AM 2/12/2008

[stocker240]

the rad is a stock calsonic unit, plastic top and bottom - the car is a '91 5-spd w hicas -i am the second owner- ive had it for 2 yrs and im not sure how old the rad is, in the two years this has been the only hiccup along the way .

[cmoody2006]

I had a major hickup with my motor that turned into a heart attack and a stroke and killed itself......... End of story lol no its not but anyone want to buy my motor for parts? lol I'm over d!ck with it and i'm trying to buy a swap now

[tramp_drift240]

hot coolant from engine flows to top of rad and works its way down to bottom and leaves bottom hose and goes back to rad

.ho

hot coolant goes from engine to top of radiator.

then leaves bottom hose and goes back to radiator?

i didnt know the coolant sits at a stand still....



top hose goes to rad, bottom goes to block.

also, thought id mention this, from what ive done so far, the headgasket replacement seems to have fixed the overheating and leaking freeze plug ordeal.

after i adjust the timing some more, ill be able to know for sure. but i was cruising earlier and it stayed right in the middle of the temp gauge.

cold outlet could mean blocked rad but it could also mean the rad is very efficient.

^ is that true?

[vancouverbc]

If the rad is blocked the water sits there and gets colder and colder. an efficient rad is going to cool things fast. i dont know what the temp in the rad should be for average rad. should rad be warm from top to bottom? should bottom hose be warm?

[tramp_drift240]

should be.

the coolant flowing through it would have to be somewhat hotter than a cold rubber hose would be with nothing in it...

right?