My 1990 CR30 4WD has a horizontal rad that never seems to get hot. If I could get coolant to flow thru this rad, it would reduce the running temp - any ideas how I could achieve this? Is there any mechanical reason why no flow occurs?

- (#2241) Paul Sammons, 20 Jul 05 15:51

There are two horizontal heat exchangers, the rad is the upper one. Coolant flows through it all the time, and the two speed electric fans are controlled by the aircon *and* an overtemperature thermal switch on the coolant outlet neck. It helps cool the engine all the time.

Maybe it's sludged up and requires a reverse flush?

- (#2241) David Miller, 20 Jul 05 15:59