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drramore
New User
Jul 17, 2012, 10:43 AM
Post #1 of 2
(2123 views)
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Hi All,
I'm having problems with my engine which overheats.
I found that the fan wasn't switching on when the temperature rose, so I replaced it with a new one, which didn't solve the problem. It seems like the bottom of the radiator doesn't become hot, and I assume that the fan switch works but simply doesn't get hot enough to operate.
I short-circuited the switch so that the fan always comes on, but although that solved the problem, it's not a permanent solution; especially as the engine still overheats around 50mins into a drive at high speed. At this point the coolant is very hot, half the coolant is missing, the radiator is cool, and there is a copious amount of steam emerging from the overflow pipe. If I top up the coolant with water then I can get another 40 mins driving at speed before the same thing happens.
I've replaced the thermostat and I've also tried bleeding the system of any air, which hasn't solved the problem. I don't see any leaks, and the coolant level is still high if I do small drives around the city (low speeds).
I'm guessing that there is a block in the radiator. I guess that this would cause the fan switch not to work, and also when the engine is working hard (and heating up) on a fast drive the coolant cannot go through the radiator fast enough, and as it boils it passes into the expansion/overflow tank and then out through the overflow pipe. When enough coolant has escaped the engine is no longer cooled and heats up on the long drives.
Does this sound like it's the case or perhaps I've not replaced the thermostat correctly and that's the problem? I'm about to send the radiator to be re-cored so if anyone can tell me what they think the problem is I'd be so grateful.
Many thanks!
DrRamore
Year of vehicle: 1997
Make of vehicle: Daihatsu
Model of vehicle: Hijet
Engine size: 993cc
Mileage: Quite a lot
(This post was edited by drramore on Jul 17, 2012, 10:46 AM)
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jul 17, 2012, 10:53 AM
Post #2 of 2
(2109 views)
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Re: Engine overheat
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This vehicle isn't sold in the states but not relevant really. You could pressure test this and look for leaks for clues but consider that whatever the cause was the head gasket or worse has about certainly taken a serious hit = damage. Radiator being cold at bottom without fan is in the cards too for the cause which include water pump not able to pump or somehow radiator is that plugged up?
T
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