I was driving on the highway the other day. After about an hour or so, I got warm so I put the heat all the way to cold. Within a minute or so my stock temp gauge shot up to H. I checked my autometer gauge and it read that I was at about 225. I turned the heat all the way up and pulled over. Popped the hood and saw that my overflow tank was nearly full. I also heard a loud knocking/clanking (sounded like when your car is cooling down and you get that clank coming from the pipes) coming from the engine....but it was idling (can you have knocking at idle?). Only other thing I saw was this:

Not sure if it means anything or not, but I took a pic anyway.

Anyway, I took the rest of my ride slow and didn't boost. Then next day, on my way home, the stock temp gauge quickly went to H again, however my autometer gauge only read 150. (Note, agian the heater was on full cold, but off). Now my autometer sensor is in the line that feeds the Intake manifold, so I'm guessing it wasn't as hot yet as the sensor that is in the block.

So again, I turned the heat up and limped my way home, didn't overheat again.

So when I finally got home, I pulled the plugs and did a compresion test. I read 205 across the board. Here are my plugs from 4 to 1:



So I'm not sure what the problem is. Is it possible to have a blown head gasket and still have full compression? When I overheated, I wasn't even boosting, however the heater was at full cold both times. Also, there is no oil in my coolant, I have fine oil pressure, full oil, and NO smoke. I'm running rich and my timing is good so I really dont think I had any detonation. Only other thing i can think of is that when I put my autometer sensor in, the line got kinked, but I dont see how that could effect anything.
I need to replace it w/ the original:

So...any ideas? I haven't driven it since, and I haven't boost it since either.


[Modified by 00SilverLS, 5:08 PM 4/6/2002]

 

that looks like that hose is kinked pretty bad. It would explain your overflow tank being full and if that is the only thing you have changed...You may not be getting collant into the block..higher temps. The coolant that should be in the block is in your overflow. I would fix that and go from there.

 

I'm def gunna fix that, but that hose only leads to the intake manifold. Somepeople block that off all together.

 

oh, i couldn't tell which hose it was. well in that case, i would check your entire cooling system for any other, kinks, blockages, etc. I am stumped though.

 

What internal mods do you have?

 

0

 

Here's a few things to try concerning your overheating.. The next time you drive it and it starts overheating again, pull over and grab the upper radiator hose. If the hose isn't hot, but the engine is then you're thermostat is probably stuck closed. Also have you checked to see if your radiator fan works? Also have you tried draining the radiator and making sure you have the proper coolant to water ratio. If you have to much water, it'll boil on you and cause the car to overheat. I learned all this from personal experience. Let us know what you find out.


[Modified by b20zkid, 4:00 AM 4/7/2002]

 

Yeah if the coolant system is flowing good try some Water-Wetter
But that kink looks bad

 

ok, drove it some more. the car only overheats if i have the heater all the way to cold. it doesn't matter if the fan is on 0 or 4. as soon as i bring it to warm, the car cools down. makes me think the cooling system is working as good as it should be...

 

Hmm... that slide lever affects the flow of coolant into the heater core.

 

almost 300 views and this is all you guys got?

 

Fix the kinked hose!!!!

the sound you heard when you overheated the car was detonation. that is what happens when the head/block get to 250 deg or so. have driven many a car with blown head gaskets and that is the sound. cant avoid detonation when the metlal is just too hot.

 

Your going to need to eliminate each problem area. FIX THAT KINKED HOSE, GET A NEW THERMOSTAT, FILL WITH NEW COOLANT AND WATER. Check both your fans AC AND RADIATOR. IM sure once u get this done then you will fix the problem, if not then think about taking it to the shop.

 

Problem's fixed. I had air in my coolant and had to bleed it out. The kink is fixed too, but that wasn't the problem.

Thanks guys, especially Tomakit.