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Heat cooling off at red lights
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gfxbss
New User
Jan 14, 2009, 3:44 AM
Post #1 of 5
(1713 views)
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Heat cooling off at red lights
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Hey guys, I drive a 1998 Ford Ranger XLT with about 140,000 miles on it. I know that the doughnut gasket between the exhaust and engine is out and I need to have that fixed. However, the problem that I am asking about is for about the last two weeks my truck has not been warming up. It will not blow air unless I am giving it gas. Also, even after it does warm up(because I have been driving) if I stop at a red light, my heat cools off again.
any ideas and help would be appreciated.
Thanks,
GFX
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way2old
Veteran
/ Moderator
Jan 14, 2009, 4:45 AM
Post #2 of 5
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Re: Heat cooling off at red lights
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If coolant is full, check to see if the water pump is circulating enough coolant to keep the hot liquid going through the heater core. Your symptoms are close to classic for water pump being weak.
Being way2old is why I need help from younger minds
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jan 14, 2009, 4:47 AM
Post #3 of 5
(1711 views)
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Re: Heat cooling off at red lights
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It's hard to follow you - Is this NOT blowing air at all at times? Cools off when stopped - you mean the engine temp drops off along with heater performance or just what?
Engine temp should stay pretty steady at ONE spot once warmed up. Granted - a good chunk of N. America is experiencing VERY cold temps with winds so I'd forgive the steady temp suggestion when below ZERO F.
For the most part engines that run too cold have a thermostat that won't shut tight or wrong thermostat. Heater going cold on you could be a water pump problem IF engine temp reads proper and outputs drop off at low RPM,
T
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gfxbss
New User
Jan 14, 2009, 10:13 AM
Post #4 of 5
(1703 views)
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Re: Heat cooling off at red lights
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sorry for being hard to follow. it is blowing air at all times. when i stop at a light the air just becomes cold. the engine temp also goes down when i am not giving it gas. we are currently at about 10 degrees F where i am at.
hth and thanks for responding so quickly.
GFX
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jan 14, 2009, 11:02 AM
Post #5 of 5
(1699 views)
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Re: Heat cooling off at red lights
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Ok: All still considered now this suggests the thermostat is partially open. For a test, from start up just feel the upper radiator hose at the radiator end and temp shoud stay cold there by feel (all cautions please!) until thermostat really needs to open at its preset temp.
They can hand just a tad open and without any load the little bit passing thru AND the heater is taking away too much normal heat too early IF YOU FEEL THAT WARM UP AT ALL FROM A COLD START.
Still needs to be known full. That meaning full at radiator not just looking at recovery tank.
Both a heater core and a radiator are really the same idea just the heater gets actual engine coolant temp all the time and by itself cools the engine but really isn't enough to totally be the only thing to bring down engine temp though it does help in hot conditions to reduce engine heat.
10F is cold but not out of control IMO. An engine produces copious amounts of heat in the course of just running and shouldn't go cold on you at just that temp.
I'll let you know soon - expecting some serious below zero #s here real soon. Nothing new but all my own still get up to normal operating temps, may take longer but they get there.
don't recall you saying what engine is in this. Some have thermostat mounted vertically and it's possible for them to fall a bit out of place when installed which could do this. I've never found an original that slipped - either way it needs a thermostat if hose gets warm as said AND the coolant is full,
T
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