Dry heater hoses?
10-11-02, 12:34 PM
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Dry heater hoses?
Why would the hoses for my heater be dry. I have been having the overheating problem, with the overflow bottle going crazy. I tested both the cap and thermostat, both were bad.. I replaced both of them, plus the upper rad hose.
I filled the coolant and let it run... it will run for a bit, at idle before heating up.
But I took off the heater hose under the oil filter and it was bone dry.... although, there is coolant on the block around where the hose connects(thought it was coming from the hose). Where could it be coming from? I cant see much in that area.
Thanks for the help.
Fikshun
I filled the coolant and let it run... it will run for a bit, at idle before heating up.
But I took off the heater hose under the oil filter and it was bone dry.... although, there is coolant on the block around where the hose connects(thought it was coming from the hose). Where could it be coming from? I cant see much in that area.
Thanks for the help.
Fikshun
10-11-02, 12:46 PM
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Overheating – check list
1) Replace the thermostat. Make sure it fits. The spring loaded disc under the stat must close the bypass port, or guess what?
2) Replace the radiator cap. Low pressure = steam bubbles = spit out coolant.
3) Look for leaks. (same symptoms as #2) Some can be very hard to find. You may have to pressure test it. A common failure spot is the 3/8” coolant line that runs from the top of the rear housing (under the intake runners) to the throttle body, to the BAC, to the water pump. Another one is the heater hose under the oil filter.
4) The fan clutch will slowly start slipping as it ages. The fan should pull really hard up to about 4k when the motor is hot. It should maintain about 4k as the motor revs higher. Sometimes you can get more life from it by bending outward the bi-metal strip on the front of the fan clutch. The cut-in for the series 4 fan clutch is gradual – it pulls some even when cold. The series 5 fan clutch is more on/off. Some after market series 4 clutches work like the series 5 clutch.
1) Replace the thermostat. Make sure it fits. The spring loaded disc under the stat must close the bypass port, or guess what?
2) Replace the radiator cap. Low pressure = steam bubbles = spit out coolant.
3) Look for leaks. (same symptoms as #2) Some can be very hard to find. You may have to pressure test it. A common failure spot is the 3/8” coolant line that runs from the top of the rear housing (under the intake runners) to the throttle body, to the BAC, to the water pump. Another one is the heater hose under the oil filter.
4) The fan clutch will slowly start slipping as it ages. The fan should pull really hard up to about 4k when the motor is hot. It should maintain about 4k as the motor revs higher. Sometimes you can get more life from it by bending outward the bi-metal strip on the front of the fan clutch. The cut-in for the series 4 fan clutch is gradual – it pulls some even when cold. The series 5 fan clutch is more on/off. Some after market series 4 clutches work like the series 5 clutch.
10-11-02, 01:13 PM
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K... I have read the overheating checklist countless times... and I have been going over the hoses looking for leaks.
That is how I found out the heater hose below the oil filter is bone dry. Which of the above would prevent coolant from reaching the heater hose? Or what would be the most likely part to check? Could it be a coolant seal causing this?
TIA
Fikshun
That is how I found out the heater hose below the oil filter is bone dry. Which of the above would prevent coolant from reaching the heater hose? Or what would be the most likely part to check? Could it be a coolant seal causing this?
TIA
Fikshun
10-11-02, 02:59 PM
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If you pull off a heater hose and no coolant comes out, something is plugged up, or blocked off, big time. Put on a clean hose - can you blow through it?
10-11-02, 08:33 PM
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Ok... I blew into the heater hose I disconnected from under the oil filter...
I could blow through it.. and I heard it pushing air into the radiator. I didn't have to blow very hard either....
But I still wonder why the heater hose was bone dry.
I replaced the hose, and the upper radiator hose again. I also have replacement hose for the heater hose on the bottom of the radiator back.
Any info here would be appreciated.
Fikshun
I could blow through it.. and I heard it pushing air into the radiator. I didn't have to blow very hard either....
But I still wonder why the heater hose was bone dry.
I replaced the hose, and the upper radiator hose again. I also have replacement hose for the heater hose on the bottom of the radiator back.
Any info here would be appreciated.
Fikshun
