If head gasket was gone would temp gauge rise
14 July 2014, 10:58 PM
#1
Scooby Regular
Thread Starter
iTrader: (1)
Join Date: Feb 2013
Location: liverpool
Posts: 760
Likes: 0
Received 0 Likes
on
0 Posts
If head gasket was gone would temp gauge rise
Been reading so much into my smoke problem and im ****ting it incase its the head gasket, temp gauge never moves so would it if it was the head gasket?
14 July 2014, 11:19 PM
#6
Scooby Regular
Thread Starter
iTrader: (1)
Join Date: Feb 2013
Location: liverpool
Posts: 760
Likes: 0
Received 0 Likes
on
0 Posts
mine smokes out of exhaust and some comes out bonnet scoop but doesnt happen all the time and when it foes its always at idle and when cars been run for quite a while
Trending Topics
14 July 2014, 11:54 PM
#8
Scooby Regular
Join Date: Mar 2013
Location: Wales
Posts: 2,794
Likes: 0
Received 0 Likes
on
0 Posts
My 95 WRX hg failure manifested itself as a rapid temp rise (almost into red) after about 10 mins but would then disappear. (Note, I was only travelling 15 mile journeys at the time).
I originally put it down to loss of coolant (always had to top it up when I got to work). Then realised that the loss of coolant was due to pressurisation caused by breakdown of HG allowing combustion gases into coolant.
Bubbling up in expansion tank on idle once warm.
But as has been said, the sniff test seems to be the best test.
I originally put it down to loss of coolant (always had to top it up when I got to work). Then realised that the loss of coolant was due to pressurisation caused by breakdown of HG allowing combustion gases into coolant.
Bubbling up in expansion tank on idle once warm.
But as has been said, the sniff test seems to be the best test.
15 July 2014, 01:23 PM
#10
A engine can overheat and the temp guage read normal.
Air lock or lack of coolant flow or blockage can prevent circulating coolant passing over the sensor, giving a false reading.
Secondly the guage has a massive hysterisis in the "normal" range. "Normal" is actually between 80 degrees and over 100degrees. Usually it will stay in the mid way position right up until around 102degrees, then suddenly and quickly shoot into the red. This is the case with most modern cars; There is no mid-way reading on teh guage between normal and overheating, even if it looks like there is.
The only way to accurately confirm the engine coolant temp is with a laser thermometer on the water jacket, thermostat housing or heater hoses (heater on full heat, fan on minimum, A/C=off). EOBD diagnostic live data will give a direct reading of what the temp sender is "seeing" (assuming coolant is circulating).
Anyhoo, as mentioned many times; sniff test on the header tank will detect head gasket issues very easily.
Air lock or lack of coolant flow or blockage can prevent circulating coolant passing over the sensor, giving a false reading.
Secondly the guage has a massive hysterisis in the "normal" range. "Normal" is actually between 80 degrees and over 100degrees. Usually it will stay in the mid way position right up until around 102degrees, then suddenly and quickly shoot into the red. This is the case with most modern cars; There is no mid-way reading on teh guage between normal and overheating, even if it looks like there is.
The only way to accurately confirm the engine coolant temp is with a laser thermometer on the water jacket, thermostat housing or heater hoses (heater on full heat, fan on minimum, A/C=off). EOBD diagnostic live data will give a direct reading of what the temp sender is "seeing" (assuming coolant is circulating).
Anyhoo, as mentioned many times; sniff test on the header tank will detect head gasket issues very easily.
Last edited by ALi-B; 15 July 2014 at 01:27 PM.
15 July 2014, 04:15 PM
#13
Scooby Regular
Join Date: Nov 2013
Location: I'll check my gps
Posts: 2,626
Likes: 0
Received 0 Likes
on
0 Posts
Thread
Thread Starter
Forum
Replies
Last Post