Hello

I have a 92 civic with a D16Z6 turbo,DSM 450's,log manifold,turbonetics WG,Mishimoto thermostat,Mishimoto fan switch, New Oem water pump,Cometic HG,ARP head studs,trying to make as clear as possible the car runs fine its my DD drive to Los Angeles from Bishop some times runs fine but when i start going up steep hills it will overheat dont know why i replaced both the sensors temp sending unit and the the temp switch did a block test and ido not have a blown HG it only happens uphill i can race the car and it dosent happen also drive it everyday and it wont overheat its driving me crazy. If any one can halp PLEASE Thanks

 

anyone

 

Does the fan run when the engine is hot? Are you losing coolant? Have you bled and pressure tested the cooling system? Is the radiator possibly partially clogged?

 

The fan turns on changed the radiator not loosing coolant ive bled it but not pressure tested it

 

I drove it yeasterday to test it and the gauge was at the top at H so i got off to check it with a temp gun and it read 215 F

 

Don't let the engine temp reach H on the gauge.

Is the lower radiator hose hot or cool when the engine overheats?

 

its hot has new thermostat and fan switch

 

Mine did the same thing a while back. It ended up being air in the lines. After it overheated, I just unscrewed the radiator cap and let the air out. Then filled it back up with coolant. Been fine ever since.

 

there should be a bleeder on the back of your housing that you can bleed the system from. when i get to my garage tonight i will snap a picture for you. sounds like tht is the issue considering you have tried everything else

 

i bled the system with the the screw thats on top of the upper radiator hose

 

yeah my friends does the same thing. he had a bad gasket but it didnt leak anything also. He used to turn the heater on full blast when it started to do that.

 

o/p perhaps you need a more efficient radiator, like a dual core radiator? idk this still sounds like a air in the cooling system problem