fan blows, but no heat
12-26-2007, 09:49 AM
#1
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fan blows, but no heat
Going on day 4 of an engine swap that I finally got done. The guys that helped with the install (or more accurately, I was their helper) were great. Any problems along the way were anticipated and intercepted. The longer I drive it, the better it runs, as I blow out any crud and moisture and the ECU gets adapted to a motor that runs the way its supposed to. I'm a happy camper.
One thing thats not going to "fix itself" is that the heater/defroster won't blow out any heat. Its not ice cold, but its obvious somethings wrong there. It seems to me like the heater core isn't getting any coolant flow. I'm not losing any coolant, and its not overheating, though the temp gauge seems to shoot up pretty quick.
So, could it be something as simple as the core not being hooked up to the temp control? Could the heater hoses have been reversed?
One thing thats not going to "fix itself" is that the heater/defroster won't blow out any heat. Its not ice cold, but its obvious somethings wrong there. It seems to me like the heater core isn't getting any coolant flow. I'm not losing any coolant, and its not overheating, though the temp gauge seems to shoot up pretty quick.
So, could it be something as simple as the core not being hooked up to the temp control? Could the heater hoses have been reversed?
12-26-2007, 09:54 AM
#2
12-26-2007, 10:02 AM
#4
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Well, there's no difference whether the car is going under or over 35mph, or idling. But I'll look more into the possibility of there being an electrical or a solenoid issue.
And no, its a VE motor. The problem with air pockets in the system tends to be a VG problem?
And no, its a VE motor. The problem with air pockets in the system tends to be a VG problem?
12-26-2007, 10:03 AM
#5
I also have this problem. I just replaced my radiator and I'm not losing coolant, and the car runs a lot better. But my temp gauge shoots up to just below Midway (Operating temp) in less than 3 minutes or so when it's cold out, and stays there. I also get heat strongest on the drivers side, then the passenger side middle vent is luke warm, and the passenger side far vent is just cool air. I checked vacuum lines and they appear to be normal.
12-26-2007, 10:10 AM
#7
I also have this problem. I just replaced my radiator and I'm not losing coolant, and the car runs a lot better. But my temp gauge shoots up to just below Midway (Operating temp) in less than 3 minutes or so when it's cold out, and stays there. I also get heat strongest on the drivers side, then the passenger side middle vent is luke warm, and the passenger side far vent is just cool air. I checked vacuum lines and they appear to be normal.
Not exclusively a vg problem,the ve is just not as susceptible to air pockets as the vg,but can happen,especially with an engine/radiator swap..
I suggest you both jack your front ends up as high as possible(2-3ft)open the rad cap,start engine,let engine run for a while while you are continuely topping off the rad with coolant.
It may also be necessary to prop the throttle open with a suitable tool to apporx. 2500rpm while you are topping off the radiator.
12-26-2007, 10:12 AM
#8
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I also have this problem. I just replaced my radiator and I'm not losing coolant, and the car runs a lot better. But my temp gauge shoots up to just below Midway (Operating temp) in less than 3 minutes or so when it's cold out, and stays there. I also get heat strongest on the drivers side, then the passenger side middle vent is luke warm, and the passenger side far vent is just cool air. I checked vacuum lines and they appear to be normal.
So is the thermostat controlled by vacuum, a solenoid, or a direct mechanical hookup? I hadn't even thought of the vacuum lines, but I guess I should check them out.
12-26-2007, 10:15 AM
#9
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Not exclusively a vg problem,the ve is just not as susceptible to air pockets as the vg,but can happen,especially with an engine/radiator swap..
I suggest you both jack your front ends up as high as possible(2-3ft)open the rad cap,start engine,let engine run for a while while you are continuely topping off the rad with coolant.
It may also be necessary to prop the throttle open with a suitable tool to apporx. 2500rpm while you are topping off the radiator.
I suggest you both jack your front ends up as high as possible(2-3ft)open the rad cap,start engine,let engine run for a while while you are continuely topping off the rad with coolant.
It may also be necessary to prop the throttle open with a suitable tool to apporx. 2500rpm while you are topping off the radiator.
12-26-2007, 10:26 AM
#10
12-26-2007, 11:05 AM
#11
1 additional step that I do was to squeeze the upper hose to get the air out of the hose and let the coolant get sucked back in. it worked well doing that to my old VE in the middle of winter in the AZ parking lot (it was late, and they're open 24/7)
12-26-2007, 11:09 AM
#12
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Just now, I had to go somewhere and just got back. On the way home, the temp gauge shot up and I'm overheating! Then just as suddenly, it stopped, as the gauge went back down to normal. I'm starting to wonder if its something as simple as the thermostat being stuck? Yeesh, look at the simple things first, duh!
12-26-2007, 11:31 AM
#13
OK I clipped and printed the photo from that thread and I'll compare. Plus give a good check around the engine bay.
Just now, I had to go somewhere and just got back. On the way home, the temp gauge shot up and I'm overheating! Then just as suddenly, it stopped, as the gauge went back down to normal. I'm starting to wonder if its something as simple as the thermostat being stuck? Yeesh, look at the simple things first, duh!
Just now, I had to go somewhere and just got back. On the way home, the temp gauge shot up and I'm overheating! Then just as suddenly, it stopped, as the gauge went back down to normal. I'm starting to wonder if its something as simple as the thermostat being stuck? Yeesh, look at the simple things first, duh!
A bad t-stat will always be bad,not bad one minute,then good the next.
12-26-2007, 12:10 PM
#14
OK I clipped and printed the photo from that thread and I'll compare. Plus give a good check around the engine bay.
Just now, I had to go somewhere and just got back. On the way home, the temp gauge shot up and I'm overheating! Then just as suddenly, it stopped, as the gauge went back down to normal. I'm starting to wonder if its something as simple as the thermostat being stuck? Yeesh, look at the simple things first, duh!
Just now, I had to go somewhere and just got back. On the way home, the temp gauge shot up and I'm overheating! Then just as suddenly, it stopped, as the gauge went back down to normal. I'm starting to wonder if its something as simple as the thermostat being stuck? Yeesh, look at the simple things first, duh!
12-29-2007, 08:04 PM
#16
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Location: DFW
Posts: 29
I'm having the same probelm and now my fan switch is out. How do I remove the fan switch? Can someone lay out the diagnosis steps for the heater problem too. Should I just attempt to jack the front end up real high and see if it bleeds out?
02-08-2008, 08:33 AM
#17
be sure to loosen (do not take out) the nut at the upper right corner (standing in front of the car) of the intake manifold after letting the car idle for a few minutes, this is the highest point of your coolants path and will get rid of a lot of air pockets.
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