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So over the past year my Roommates Montero has had overheating issues. I’ve gotten it to stop at times, But it always comes back up. When I wasn’t available he would take it to his local mechanic and have them take a look at it. They’ve cost him more than enough and I’m tired of him having to fork out money into it.
Originally I knew he had a coolant leak, So I find a cracked rad, so I put in a new Rad and thermostat, as well as ran a self flush kit through it to help clean out some gunk. that helped for a few months, then that rad cracked as well, Figured it was a cheapy so just warrantied it out, and his mechanic put that one in. Also told him he needed a new thermostat because it was bad. Thought nothing of it because i’ve seem them bad out the box and its like 8 bucks. no biggie. They put the new rad in and thermo, and did a full flush. It overheated still the next week. They claimed it had a bad water pump and replaced that. Then said it was a bad cluster guage and replaced it and bolted an aftermarket to his dash. I’ve ran a combustion leak test and it tested fine. It’s not leaking oil anywhere, oil doesn’t look milky. It’s got plenty of fluids all around.
I’m at a loss on what to do next. Any and all help or ideas are welcome.
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Does the fan operate when it gets hot?? Next question. How old is the radiator cap? Something as simple as a bad cap can keep the system from being fully pressurized. The next thing is not so good. Sometimes the coolant passages inside the engine just get too contaminated to provide adequate cooling…I’ve seen this on an occasion. Is the outside of the engine block caked with oil and dust? Clean it off to bare iron. How is your heater at the vents? Try temporarily bypassing the heater core to see if that resolves your problem. Those can clog.
I hope this helps.
The fan runs normal as I doubt it would even turn over if the fan wasn’t spinning. (It’s a front serpentine, and if it died the whole engine goes with it I presume.) and the system is running clean as it’s been flushed twice. After about two weeks of running when I check the coolant it is nice and clean. The cap is new as the shop decided to replace it when they put the new rad in. It’s not leaking oil, I replaced both valve cover gaskets about a year ago because I saw one was leaking, not much but figured it was a cheap fix to rule out. Heater runs solid and A/C runs quite cold.
As I live in kentucky, that heater was quite needed this winter and it runs great. I’ll give a go at the heater core though.
I’m assuming it’s a mechanical fan. Basically those have a clutch and when it gets hot it’s supposed to engage and make an audible wind noise while you drive. Kinda like a ups truck. If you don’t hear the fan kick in when your idling in traffic or when it gets hot then it’s probably just free wheeling and not really pulling any air. The fan can be spinning and not do a damn thing if the clutch isn’t activating.
You can get a pyrometer…The little laser pointer thermostat and you can judge where your bottle neck is on the cooling system. The hottest temps should be where the coolant is coming out of the engine and back into the radiator to be cooled. Usually the hose on top for most cars.
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