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Can't get the same temperature from all radiators - have tried turning both controls on rads over a period of 1 month and still can't get them at an even temperature, we have no thermostat control! Vaillant ecoTEC Pro.

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  • David Shaub May 11, 2010

    I've never heard of a laptop with radiators. What exactly are you trying to do?

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I had this problem recently and all I did was to bleed the radiators. you probably have air locks and this creates pockets where the water cannot flow into and there froe cannot heat.

Posted on Oct 15, 2009

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1996 Legacy Overheating It has coolant and both fans are working. Overheats after about 10 min of driving. Checked oil was a little low put 1 liter in. Radiator has pressure, opened when hot and coolant...


Costs nothing to try this, just in case coolant level was low when or after bottle changed, and you got an airlock. Start car when cold, rad cap off and heater on. Now let in run until it comes up to normal operating temperatures and rad fan(s) kick on and off, 2 or 3 times, and add coolant to proper level in rad if it goes down during process. Then after that, put rad cap back on, fill coolant return bottle to proper level and try it. Quite often when re-filling an engine cooling system, people forget to turn on heater to get coolant circulating through the heater core.

Nov 06, 2010 | 1996 Subaru Legacy

1 Answer

Im stuck...I have an 04 Srt-4 and the Radiator Fans Havent been working period and with the California heat its making my car overheat quickly at idle. Ive taken the car to a shop and had a dianogstic ran...


hi, please check your radiator stat, you may have another on the head wich may be connected to the E C U. if you feel down the side of the rad. should find two connections into a small unit screwed into the rad. these sometimes burn out. to test if rad. stat is open circuit ( link the two terminals together this is only a temperature switch) i hope this infor. usefull gerry

Sep 07, 2010 | Dodge SRT4 Cars & Trucks

1 Answer

Central heating radiators downstairs take a long time to heat up


Problem is balancing & flow. Turn down the other rads until the inlet [flow] pipe is hot but the outlet [return] is luke warm. The rads have two valves - use the one which has a non-operation cap [just turns without doing anything]. when all the rads are the same temperature the system is said to be balanced and should be left like that using the other valves [with operating cap] to turn them on or off as required

Dec 13, 2009 | Water Heaters

1 Answer

I took my 99 dodge grand caravan to advanced auto and got a computer readout of p1491 as the error code. is this important and is this expensive?


P1491 is Radiator Fan Control Relay Circuit. MEANING: An open or shorted condition detected in the low speed radiator fan control circuit.
Some questions for you:
1. Is your Caravan overheating?
2. Is your Caravan water temperature spiking going past the midway point on the Temp Gauge before the radiator is engaged?
3. Is your Rad Fan coming-on and then turning off and back-on in a very short period of time (like under a minute?
If all of these are "No" then do not worry about it.


Nov 15, 2009 | 1999 Dodge Grand Caravan

2 Answers

2002 pt cruiser overheating was told i need a new raditor and thermostat for 1 grand sounds fishy


Flush rad & change coolant & thermostat. Check operation of rad fan, & make sure it is coming on when engine reaches normal operating temperature. Be sure to bleed air out good when refilling rad/cooling system. Start engine & turn heater on when refilling & let rad fan come on & off at least 2 or 3 times before putting cap back on rad, and refill rad as needed as you do this. then fill return bottle to proper level & see what happens.

Jun 27, 2009 | 2002 Chrysler PT Cruiser

1 Answer

I have 97 dodge caravan 3.0 and i put in a brand new radiator and thermostat.Now the cooling fans dont come on and fluid is bubbling up and coming out of the reservoir. But if I unplug the temp. sensor...


Not unusual to get big airlock if heater (not defrost) isn't on during bleeding process. I usually start vehicle, top up rad 1 " or so from top,turn heater on , then watch temperature gauge & wait for fan to come on after I see flow through rad indicating thermostat opened.(Normal operating temperature)I let it do that about 3 times before I put rad cap back on, after topping rad up to about an inch or 2 from top. Then fill coolant return bottle, to proper level. It may be your problem, but if your temperature gauge goes way up past normal operating temperature, before you see flow in rad, then maybe a faulty thermostat is the cause.

Jun 11, 2009 | 1997 Dodge Caravan

1 Answer

Radiator whines and overheats when not moving


Have someone flush cooling system & check condition of rad for debris in front of rad & blow or spray it out as necessary. Next time it runs hot, turn your heater temperature up high, blower fan on high, and see if gauge starts to come back down a little. If it does, my guess is your rad needs replacing, or at least consider trying a good reverse flushing of the system first, then rad.

Apr 22, 2009 | 1998 Dodge Grand Caravan

2 Answers

I have a 2002 Chrysler Town and Country minimvan that has a 3.8L V-6 engine. Water gets out of radiator but no leaks are seen under vehicle. Water in reservoir tankstays full even though radiator is low of...


You may have a faulty rad cap, grab a new one at autoparts store, and try this first. With engine cool, take rad cap off, start engine & turn heater(not defrost) on. Top up coolant in rad to 1-2" from top. Let it run with cap off and add coolant as needed, until the engine reaches normal operating temperature, and the rad fan comes on, then shuts back off. Let it run like this until that fan comes on & off at least 3 times. Add coolant as needed in rad, while you watch it, and rev engine slightly every once in a while for 5 or 10 seconds. After rad fan has come on & off 3 times, make sure to top up coolant to 1-2" from top in rad, and put your new rad cap on all the way, and now lets see what happens. If at any time the temperature gauge goes up too close to hot, shut it off, let it cool down & try again. Top up coolant bottle to marked level .Let me know. It should now run normal temperature and have heat as required. If yu feel ambitious, it never hurts to change thermostat if it hasn't been done in a while, but at this time, it may not be necessary. My guess is problem is faulty rad cap & an airlock in your system. After all this is done, if all seems o.k. keep an eye on coolant level, my guess is it will be o.k. , if not get back to me.

Feb 28, 2009 | 2004 Chrysler 300

2 Answers

Overheating


Did you bleed the cooling system after refilling the radiator ? to bleed the system, fill the radiator with water and coolant. Run the engine until it is at a good temperature. Then turn off the engine and look for a bleeding screw at the oulet of the thermostat housing and turn it with a screwdriver counterclock wise. The trapped air will go out and coolant will start coming out. refill the radiator and repeat until only coolant comes out and no air.be careful not to burn yourself.

Feb 16, 2009 | 1994 Dodge Caravan

2 Answers

Check engine light is steady on 2003 Chevrolet Impala LS


Wedge, chances are your radiator might be clogged. Rads are designed to provide cooling even if a certain capacity is not flowing (10% or so). Beyond that, you will start to experience higher engine temperatures. You will usually start to see it when your vehicle is under load (AC is on, towing, steep inclines). By turning on the heat, you introduce your heater core into the cooling equation, therefore increasing the capacity of your cooling system enough to make up for the loss in your radiator. If your cooling system is ever low, rust develops in your block which is cleaned away by DEX Cool. However, this rust turns into a red mud which often ends up in the radiator (happens often in chevy pickups with the 5.7L). You have a few possible options if this is your problem.
1. Flush your cooling system. Not just the rad, the entire system. Make sure you get the dirty coolant out of the block.
2. This is rarely done anymore, but you can have you radiator rodded out. This involves a radiator shop taking you radiator out, removing one of the tanks, and pushing a long rod through each tube to remove any contaminates. It is not done much anymore as a new rad is often about the same cost.
3. Replace the rad.
Any route you take, make sure the ENTIRE system is flushed properly or you run the risk of recontamination your entire system. Hope this helped.

Jun 27, 2008 | 2003 Chevrolet Impala

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