Hi all, I have a 91 Nissan Max and the radiator system is building up pressure and the car is over heating.. Any tips on what it is? I change the radiator, thermal stat, and hoses.. Can water pump make the system build up pressure?

 

Bleeding problem: there are still air pockets which have to be bled out. Check process from manual (top left 'Favorite Links', see below). I do bleeding by prying heater hose ajar (makedo minuscle leak), drive one hour, with 2k rpm, adding fluid as necessary.

Pressure builds also if head gasket blown, I wouldnt suspect that in the first place.

 

Quick question... Is the power steering belt connected to my water pump..? It seems like ever since I took off my p/s belt it was over heating..

 

Yes. Pls read all pages through, currently its just a 'collection'. See link below, This pic in page 23:


[A.] Cranckshaft pulley for 3 belts (Note smaller Pwr steering pulley diameter).
[B.] Power Steering pump; b. tightening pulley and
[C.] Water Pump employ belt (1.) nearest to engine.
[D.] Alternator (used to tighten the belt no.2, Gates Micro-V 48347).
[E.] A/C Compressor; e. tightening pulley (for outmost belt 3., Gates Micro-V 48380)

 

Note: its known that some pump blades may corrode totally and pump has to be replaced. You dont know before taking it out... Symptoms partially fit your case. But if cooling after bleeding is ok, dont worry about this.

 

Thanks for the help.. I put the belt on and its still building up pressure in the hose.. Before I replace the pump how do I bleed this system correctly? Do i take off the raditor cap and let it run?? Thanks..

 

See/read page 8, midpage quote: "The remedy is thorough bleeding using BV bleed valve or driving heater hose ajar (small leak) for 1hr above 2k rpm ... after leak source correction.

If I remember right, FSM tells to raise the car front 10" while BV is open, check how it is
... top left 'Favorite Links', via link below.