90 yj running hot

Just got my jeep back from the shop after the water pump went. Now it is running hot. Will go up to just below red line, then drop back down to normal running temp. checked the fluid in the rad and it is up to the top, but the overflow bottle was real low. topped that up and it is still running hot. any ideas? radiator was pulled and checked when the water pump was done. its a 6 cylinder. any ideas as to what may be up? thanks.

Reply to
Jason Halsey
Loading thread data ...

Jason Halsey did pass the time by typing:

Thermostat sticking or possibly the wrong pump. One turns clockwise, the other counterclockwise.

You should be able to see the flow by looking into the radiator. (just do it with the system cool)

Reply to
DougW

As Doug said: wrong pump (they are different for the V belt and serpentine versions) or stuck thermostat.

take it back to the sh> Jason Halsey did pass the time by typing:

Reply to
RoyJ

but would either of those account for the temperature fluctuations? ie running up to the red, then dropping, then back up to red and dropping, etc?

Reply to
Jason Halsey

Reply to
RoyJ

Could air trapped in the block or hoses cause this? Just a thought...

scotty

Reply to
Scotty

MotorsForum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.