Disco I High Temperature
#1
Disco I High Temperature
I recently bought a 1999 Disco I which had a seized fan clutch. I replaced the clutch twice and it never stopped overheating. I then put the seized fan back on and it seems to cool fine. I also changed the thermostat and it didn't change anything. I switched to an electric fan and I thought everything was fine until today on a longer trip it started overheating again. It seems to be more present on highway rather than in town which I think is weird. Any idea what the problem could be?
#6
#7
#8
There are 135,000 miles on the vehicle and as far as I know the water pump is original. It isn't leaking so what would go bad on the water pump? I assume the coolant is original too but it doesn't look bad. The electric fan I put on is an 18 inch Mark VIII with 4500+ CFM which I found are used in many performance upgrades due to its cooling power.
#10
Join Date: Aug 2006
Location: Colorado Springs, CO
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The fact that it's happening at highway speeds pretty much tells you right there. It's not the fans. Your radiator is restricted. I had a similar issue about 5k ago. I installed one of these https://www.performanceradiator.com (I was in Phoenix at the time) and have had no issues since. IMHO I see no reason why it would be your water pump. Water pumps begin to fail based on bearings and seals leading to leakage. However, they'll keep pumping until they blow up.
You have a bad radiator.
You have a bad radiator.