2001 Montero Sport 3.0 Overheating on Grades
#11
10-08-2018, 09:51 AM
In that case I'd be suspecting the water pump. I know you said you've replaced it recently. Was it and OEM Mitsubishi pump? It's possible that the aftermarket may have worse flow and it only shows up on long grades when engine has to work extra hard. When you replaced the water pump, did you replace timing belt and tensioner? Old tensioner could allow some belt slippage over the water pump pulley.
Before you go any further. Check for air trapped in the system once more. Park on the level surface (hopefully cold engine or let it cool off). Open the radiator cap (slowly), Find and unscrew two bleeder bots near the thermostat housing (I think they are 12mm size heads). Those small bolts are going VERTICALLY into the housing near radiator hoses. You should see coolant coming out slowly from the openings when you add coolant to the radiator. If you have any air trapped in the system, this you'll have big bubbles coming first, then coolant.
Before you go any further. Check for air trapped in the system once more. Park on the level surface (hopefully cold engine or let it cool off). Open the radiator cap (slowly), Find and unscrew two bleeder bots near the thermostat housing (I think they are 12mm size heads). Those small bolts are going VERTICALLY into the housing near radiator hoses. You should see coolant coming out slowly from the openings when you add coolant to the radiator. If you have any air trapped in the system, this you'll have big bubbles coming first, then coolant.
#12
10-08-2018, 11:36 AM
I’ve had this problem before with my montero...i had an egr code for restricted flow,cleared it using my obd tool. After a week of no check engine light I went for a long drive. I noticed my temp going higher than normal when going uphill. Checked everything on my way back but all seems to be working. Then the check engine light came on again..same restricted flow of the egr. Turns out the egr vacuum solenoid is intermitently faulty. Changed the solenoid and cleaned egr ports on intake manifold and everything is back to normal again..not saying we have thesame problem.
#13
10-08-2018, 02:33 PM
I’ve had this problem before with my montero...i had an egr code for restricted flow,cleared it using my obd tool. After a week of no check engine light I went for a long drive. I noticed my temp going higher than normal when going uphill. Checked everything on my way back but all seems to be working. Then the check engine light came on again..same restricted flow of the egr. Turns out the egr vacuum solenoid is intermitently faulty. Changed the solenoid and cleaned egr ports on intake manifold and everything is back to normal again..not saying we have thesame problem.
#14
10-08-2018, 04:53 PM
Yes hunterD...i was skeptical at first when I learned about it. That’s why I made sure that It had no leaks and both fans are working properly. Temp would only be higher when going uphill...more strain on the engine. When roads become flat again it goes to back to the normal temp. I guess the very hot gas from the egr needs to go out somewhere or it will cause the engine to become hotter at certain conditions. It happened almost three years ago...never happened again.
Last edited by carlsson01; 10-08-2018 at 04:59 PM.
#15
10-08-2018, 05:55 PM
In that case I'd be suspecting the water pump. I know you said you've replaced it recently. Was it and OEM Mitsubishi pump? It's possible that the aftermarket may have worse flow and it only shows up on long grades when engine has to work extra hard. When you replaced the water pump, did you replace timing belt and tensioner? Old tensioner could allow some belt slippage over the water pump pulley.
Before you go any further. Check for air trapped in the system once more. Park on the level surface (hopefully cold engine or let it cool off). Open the radiator cap (slowly), Find and unscrew two bleeder bots near the thermostat housing (I think they are 12mm size heads). Those small bolts are going VERTICALLY into the housing near radiator hoses. You should see coolant coming out slowly from the openings when you add coolant to the radiator. If you have any air trapped in the system, this you'll have big bubbles coming first, then coolant.
Before you go any further. Check for air trapped in the system once more. Park on the level surface (hopefully cold engine or let it cool off). Open the radiator cap (slowly), Find and unscrew two bleeder bots near the thermostat housing (I think they are 12mm size heads). Those small bolts are going VERTICALLY into the housing near radiator hoses. You should see coolant coming out slowly from the openings when you add coolant to the radiator. If you have any air trapped in the system, this you'll have big bubbles coming first, then coolant.
Last edited by Wilbert Wilson; 10-08-2018 at 06:02 PM.
#16
10-08-2018, 06:01 PM
Interesting point. Never thought of EGR malfunction being a contributing factor to overheating. Looked more into it and it turns out you are right - it could be a contributor under certain conditions. According to the article other points that can contribute to overheating - low engine oil level, transmission malfunction, restricted exhaust, sticking brake calipers.
Last edited by Wilbert Wilson; 10-08-2018 at 06:16 PM.
Thread
Thread Starter
Forum
Replies
Last Post
oldslowguy
Mitsubishi Montero & Montero Sport
0
07-13-2014 05:05 AM
