1984 Volvo 240 gl over heating at idle
#1
1984 Volvo 240 gl over heating at idle
1984 Volvo 240 gl over heating at idle, I recently got it started changed the oil and coolant, however I don't see the coolant drain plug it's neither at the top or bottom, and when I start it it fills the tank on the side that u pour the coolant into, it idles then after a few seconds it idles a little higher and then starts over heating, I changed the coolant thermostat and the gasket on it seems to be leaking very little coolant is coming out from there, and I hear a sound like something is boiling, and when I start the car the tank fills up and the cap starts leaking out when it gets to filled, it's almost as if the lines are clogged but they aren't and I'm thinking it's the temp sensor but I don't know if anyone can help please thank and you.
Last edited by Sulaymaan; 09-02-2020 at 09:45 PM.
#2
#4
Yes, they get partially clogged and can't dissipate the heat - Worse the hotter it is outside and/or with ac on. The radiator cap needs to hold pressure also - have you tested it?
Does it still overheat if you turn the heater on full hot, with fastest fan speed?
Does it still overheat if you turn the heater on full hot, with fastest fan speed?
#8
#9
If the heater valve is opening and it's not hot (and the water in the engine is) - that means water is not flowing - combustion gasses from a bad head gasket can disrupt the natural flow of coolant in the engine. Those engines did not have a problems with air pockets, the air always bled out easily so -
I would be checking for head gasket damage by noting extreme/too quick pressure build up in the cooling system (with a radiator pressure tester), coolant leaking into a cylinder with cooling system under pressure with engine off, (you might get a misfire when first started if only a small amount of coolant leaks past the gasket) Sometimes the odor in a coolant bottle tells you the gasket is damaged - Fill it up w water, start the car with the cap off - does the coolant fill up and start overflowing immediately? Or if it's boiling out of the coolant bottle with the cap off after running for only a few minutes - you have a blown head gasket.
For a more exact answer you could check for HC gasses being in the coolant bottle. There's this
and i'm sure there are many other options to find HC in the coolant. .
I would be checking for head gasket damage by noting extreme/too quick pressure build up in the cooling system (with a radiator pressure tester), coolant leaking into a cylinder with cooling system under pressure with engine off, (you might get a misfire when first started if only a small amount of coolant leaks past the gasket) Sometimes the odor in a coolant bottle tells you the gasket is damaged - Fill it up w water, start the car with the cap off - does the coolant fill up and start overflowing immediately? Or if it's boiling out of the coolant bottle with the cap off after running for only a few minutes - you have a blown head gasket.
For a more exact answer you could check for HC gasses being in the coolant bottle. There's this
and i'm sure there are many other options to find HC in the coolant. .
#10
#11
If the heater valve is opening and it's not hot (and the water in the engine is) - that means water is not flowing - combustion gasses from a bad head gasket can disrupt the natural flow of coolant in the engine. Those engines did not have a problems with air pockets, the air always bled out easily so -
I would be checking for head gasket damage by noting extreme/too quick pressure build up in the cooling system (with a radiator pressure tester), coolant leaking into a cylinder with cooling system under pressure with engine off, (you might get a misfire when first started if only a small amount of coolant leaks past the gasket) Sometimes the odor in a coolant bottle tells you the gasket is damaged - Fill it up w water, start the car with the cap off - does the coolant fill up and start overflowing immediately? Or if it's boiling out of the coolant bottle with the cap off after running for only a few minutes - you have a blown head gasket.
For a more exact answer you could check for HC gasses being in the coolant bottle. There's this
https://www.amazon.com/Lisle-75500-C.../dp/B0007ZDRUI
and i'm sure there are many other options to find HC in the coolant. .
I would be checking for head gasket damage by noting extreme/too quick pressure build up in the cooling system (with a radiator pressure tester), coolant leaking into a cylinder with cooling system under pressure with engine off, (you might get a misfire when first started if only a small amount of coolant leaks past the gasket) Sometimes the odor in a coolant bottle tells you the gasket is damaged - Fill it up w water, start the car with the cap off - does the coolant fill up and start overflowing immediately? Or if it's boiling out of the coolant bottle with the cap off after running for only a few minutes - you have a blown head gasket.
For a more exact answer you could check for HC gasses being in the coolant bottle. There's this
https://www.amazon.com/Lisle-75500-C.../dp/B0007ZDRUI
and i'm sure there are many other options to find HC in the coolant. .
#12
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#14
ok so I found a hose with alot of holes I plan on changing all the hoses, but Its the inlet hose to the raidotor from the coolant tank, so i changed it and it still heated maybe I need to bleed it, I was rushing so I couldn't bleed it properly.
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#16
could that effect anything?
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