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Hey I am new to this forum and having some trouble with my 2002 Civic Si. I have had the car for about a year now but about a month ago the temperature gauge started going over the half way point. I noticed the lower radiator hose was cool while the top one was very hot so I replaced the thermostat. I did a coolant bleed and the new thermostat seemed to open up and the lower rad hose got warm and I haven't noticed any overheating for a few weeks until today. While driving i noticed my temp gauge went all the way up so I pulled over and I noticed that the top rad hose was suctioned up and the lower rad hose was cool. My engine light also came on and a diagnostics test showed a fault code of P1361 Intermittent Interruption In TDC 1 Sensor Circuit and also P1259 VTEC System Malfunction although I am not sure if the latter code is related to the issue because I have gotten it before.

Does anyone have an idea what might be the problem? Thank you in advance

 
Rep Power: 229

Was the coolant low?

if so where did it go?

Leak? Fix the leak and monitor.
Internal burn? (may need new head gasket).

 
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So it ended up being a blockage in the hose. Oops! Im a newbie