Redtop in S14 overheat problem..

[dog3gtr]

Hi. I have S14 w/ redtop SR20DET and also KA A/C system still in, working.
I have all stock SR20DET stuff like radiator w/ re-sealed waterpump and Nismo Thermostat.

The problem is it's got really weird situation.

After all the swap, driving in the city works fine..

However, if I drive on highway, after 20 mins or so, water temp starts to go up. I always turn on the heater when temp reach three quarter, and it goes down.
Also, after 1 hour straight driving on highway, at 80mph, temp goes up again although I have heater on, but at 70mph, it goes down..

If I drive hard in the city, the temp also goes up..
Stop and go situation, the car is okay..

Although temp increased, the car drives okay.. I just keep it not to over three quarter.

What could be a problem? I'm lost..

[jdm_s14_zenki]

thermostat problem, or bleed air out of radiator/cooling system.

[reccakun08]

thermostat problem, or bleed air out of radiator/cooling system.

^^ i would try bleeding the system


just curious what kind of radiator and fans are you using?

[fliprayzin240sx]

Since you have a S13 engine in a S14 chassis, did you swap out the water temp sending unit in the redtop for the stock S14 sensor from your KA? Theres a voltage difference between the 2 and if your running the SR water temp sensor, the stock S14 gauge will show it HOT when its not.

[dog3gtr]

I did bleed many times..Also put the water wetter.. a good stuff.

Fan and radiator are all from the clip, SR20DET redtop nissan stock ones..

Yeah.. One of my frd had similar problem and turned out to be a sensor problem.. I may look into that tmrw..

Any other guess guys?

[srpowereds14]

Yeah your suppose to use your KA temp sensor like what ray said most people over look it.

[jdm_s14_zenki]

^^^ TRUE. i would check also (just cus im anal) the coolant temp sensor and t-stat.

[blu808]

Its because the s13 temp sender has a different voltage range.