Over HEATING issues

[richterjustin08]

I have a 98 disco, body has 180k miles on it, motor milage is unknown... Things I have done to motor:
1: full valve job done on heads because of blown head gasket
2: all new top end gaskets, ex: intake, exhaust, valve cover
3: one new heater hose the one closest to the inside of plenum.
4: used t- case had to put another one in
5: transmission fluid and oil changed..
6: new thermostat
7: NEWmaster cylinder
The issue I'm haveing like today I drove on highway doing 65-75 mph and then iook up and the thermostat is getting hot , so jet off gas and the Guage goes back down to normal.. but as soon as I speed back up it read hot barely. Right below the red line... Now this happend today between 11am - 4or 5 .. as soon as it cooled down outside I was driving a steady 75-80 and she's staying at normal temp... Now it did go up a little from half but not that much...
NEED HELP AND IDEAS... PLEASE ASK ME ANYTHING...

 

[joey]

Bad fan clutch or need a new radiator... or maybe both?

 

[Disco Mike]

You may have a plugged up radiator, a bad viscus clutch and your electric fans may not be working.
If you want help with this, PM me your number and I'll walk you thru testing.

 

[richterjustin08]

Both electric fans are working. By the way I even drove with the heater on and it was still gettin.g hot as well..
Is their a way to check the vicissitudes clutch ?

 

[Disco Mike]

Yes, but in the mean time quit driving it cause every time that temp gauge climbs, it is costing you more to fix it.
As for the clutch, spin the fan, prior to a cold start, a couple of times then with the engine hot, spin it a couple more times. It should be twice as hard to spin when hot compared to when cold.
Also, do you have a scanner so you read the actual running temps?

 

[richterjustin08]

Well goong to replace fan clutch, it spins like crazy after being hot.. hopefully that's it. Will update and let know

 

[mark D]

Clutch fan should spin like it has a friction brake on it. If you spin it the fan should stop rotating instantly as soon as you release it if it is in good working order.

 

[richterjustin08]

Found fan clutch, heavy duty one thru summit racing for 56.

 

[mark D]

if it fits put it on and test your temp it should cool instantly if that is the problem, like Mike said you may need a radiator as well the two work hand in hand.

 

[richterjustin08]

Well understandable.. more than likely just hoping not cause their not cheap , but will let u know guys. Part comes in Tuesday