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Old 02-27-2008, 10:22 PM   #1
90E30i
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Unhappy I need heat

I have heat when the car is idling or when I'm cruising at really low RPMs. but as soon as the engine speed goes over 2k rpm I loose all heat and it starts to blow cold air.

The motor is rebuilt with about 500 miles on it. New thermostat, New water pump. I thought the problem was with the little valve that goes between the cylinder head and the heater core so I bypassed that but the problem is still there.
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Old 02-27-2008, 10:43 PM   #2
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If you haven't had heat since the new thermo, try aggressively bleeding before doing anything else. Also, check the upper rad hose for warmth just after you start it while sitting. It shouldn't get warm until the engine is blowing heat, if I'm not mistaken.
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Old 02-27-2008, 10:51 PM   #3
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the coolant seems to be cerculating fine, and the heat is really good when its idling, as soon as I start driving the car, or rev up the motor to around 3k rpm is when I loose all heat.
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Old 02-27-2008, 10:57 PM   #4
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Sorry, here is what I meant: Right after you start the car, the thermostat should block the hot coolant from the rad until the thermostat hits its opening temp. Therefore, right after you start the (cold) car, the upper rad hose shouldn't get hot for a short while. The thermostat should be recirculating the fluid until it gets fully hot.

If the thermostat is stuck open (most thermo's default to this when they fail or are faulty too) then all the coolant is going through the rad, all the time. When its cold out, it would take a LONG time for the coolant to get warm. You'll get heat when you're stopped, but when you move, you won't.

Edit: when you rev up the motor, it spins the fan fast and cools down the coolant too.

What does your gauge read when this is happening?
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Old 02-27-2008, 11:23 PM   #5
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What does your gauge read when this is happening?
the gauge is not working 100% but I'm running Megasquirt and the tempreture shows around 180-190 when its fully warm which meants the thermostat is doing its job.
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Old 02-27-2008, 11:30 PM   #6
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Dunno then mate, sry.
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Old 02-27-2008, 11:55 PM   #7
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I'm no expert but I can think of one thing; maybe your rad fan is not turning off?

Also try putting the air on recirculate see what happens?
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Old 02-28-2008, 11:18 AM   #8
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if you keep the revs up for a few minutes while parked(neutral), does the engine start getting hotter than normal despite the thermostat working?
Should you consider looking at head gasket failure?
Is your A/C coming on? hahaha
Could still be waterpump even if it is new, something may be wrong.
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Old 02-28-2008, 01:59 PM   #9
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Quote:
Originally Posted by supernaught View Post
if you keep the revs up for a few minutes while parked(neutral), does the engine start getting hotter than normal despite the thermostat working?
Should you consider looking at head gasket failure?
Is your A/C coming on? hahaha
Could still be waterpump even if it is new, something may be wrong.
The temps don't go any hotter then 190.

Head gasket failure might have been possible but if that was the case the cooling system would get over pressurized, which is not the case. and like I said the car does not over heat, at all.

I don't have A/C in the car. all the a/c parts have been taken off.

I already replaced a good water pump thinking that was the problem, but that wasn't it.

I have been driving the car for about a month now, and there is no other issues with the cooling system, other then the heat.
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Old 02-28-2008, 02:42 PM   #10
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you might have put the hoses to the heater core on backwards
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Old 02-28-2008, 03:30 PM   #11
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you might have put the hoses to the heater core on backwards
would that cause a problem, I figured as long as coolant is flowing thro the core, it shouldn't really matter which way its flowing.
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Old 02-28-2008, 07:11 PM   #12
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http://www.maxbimmer.com/forums/show...ter+core+valve
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Old 02-29-2008, 01:14 PM   #13
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you might have put the hoses to the heater core on backwards
How did you know.

I haven't switched them yet, but I think that's the problem.
When I rev up the motor the top hose on the fire wall, which goes to the port on the back of the cylinder head gets hot and pressurized but it does not flow thru the core because the bottom hose gets cold and stays up pressurized.

Thanks for all the help guys
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Old 02-29-2008, 09:29 PM   #14
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How did you know.
Common mistake done on 24v swaps. I didn't it do it though.
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Old 03-01-2008, 11:55 AM   #15
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Originally Posted by 90E30i View Post
How did you know.
NickP is the king of random E30 knowledge.

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