RB20DET Waterpump (Are there differences?)

[Smitty2u]

RB20DET Waterpump (Are there differences?)

Guys, having heating issues with the RB20DET.is there a difference between watrerpumps?

Recently changed the waterpump as it appeared to be leaking.  Turned out to be a pinhole leak in the radiator.  Anyway, the engine takes a while to warm up, doesn't seem to want to get above 1/4 when idling however when you take it out for a drive it goes up to 3/4.  When you stop at the lights the temp gauge drop back down towards 1/4.

We've tried swapping radiators,fans and, thermostats.  Still the same.

Is there a difference in waterpumps?( I'm aware there is one with a slotted top hole.)  The only thing I can think of is there is some difference between the one we took off and the one we pout on.  ie: If the one we put in has move fins on the impeller.

Any other ideas?

cheers

[KiwiRS4T]

Sounds like its the gauge. Have you measured the water temperature at idle with a thermometer or laser gun type gauge? What kind of thermostat did you use and did it have an opening temperature stamped on it or printed on the packaging? Have you bled the system thoroughly?

[Smitty2u]

49 minutes ago, KiwiRS4T said:

Sounds like its the gauge. Have you measured the water temperature at idle with a thermometer or laser gun type gauge? What kind of thermostat did you use and did it have an opening temperature stamped on it or printed on the packaging? Have you bled the system thoroughly?

Haven't measured the temp yet.  Bought a Thermometer today to try.  I've tried 2 new thermostats.  A genuine nissan one (70 *C) and a high flow triton one  (77*C).  Bled the system over and over again.  I believe some of the water pumps come with 6 blades and some come with 8.  I'm just wondering if it makes a difference?

Edited April 28, 2017 by Smitty2u

[KiwiRS4T]

You want a thermostat that opens at 82 deg C

I don't believe the pump is making your engine take longer to warm up. The way to warm up your engine is to drive the car. Sitting around idling is never a good thing.