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Lost all my coolant I used radweld and replaced the coolant,my heater blows only cold air. The coolant hoses going into the fireguard are cold both are hot at the bottom. Its a 1998 A£ 1.8 sport

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Quite possibly using the radweld you plugged up the heater core and now it needs replaced .

Posted on Dec 29, 2016

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Not overheating but blowing cold air


check radiator coolant level when cold and if you need to top up only use antifreeze ,if problem persists and its losing coolant then take to a garage

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Heater blows cold air--where is heater control flap or switch?


These cars are notorious for having blocked heater cores, causing the heater to blow cold air. That's because there is a heater core bypass hose near the firewall that allows the coolant to bypass the heater core. Eventually the heater core fills with gunk and no coolant passes through it. You'll need to disconnect the hoses from the heater core at the firewall and flush the core using a garden hose. Flush both ways till water runs clear. If you can't access the heater core fittings at the firewall, then follow the hoses from these fittings back to the engine and disconnect them at that point and flush from there. If you flush from the hoses in this manner, it is important that you clamp off the bypass hose at the firewall with a vice grip pliers.
Otherwise the flushing water will go through the bypass hose and not the heater core.

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2003 f350 diesel no heat


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The heater in my megane coupe (97) is a no goer and blows out cold! Great in the weather weve had! My Dad did try to fix a leak I had by puttin in some RADWELD and not long after - I lost my heat...is...


stop gap measures cause more problems than they fix
will have to replace the heater core ( if that was the leak)or fix the leak properly, flush out the cooling system properly and refill with the correct coolant conditioner mix

May 14, 2017 | Renault Sport Cars & Trucks

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Heater is only blowing cold air, engine coolant is not all the way full. What do I do?


First, fill the coolant - heat extracted by the coolant from the engine is used to heat your climate-controlled air. If you don't have enough coolant, you won't have the ability to heat your interior. Once you've filled the coolant, burp the system (click my screenname, go to Tips and Tricks, and the procedure is there). That should do it.

If you still don't get heat, disconnect the heater core hoses, put one in a bucket, and use an air compressor to blow into the other one. Then reverse it (swap hoses) - you may have something blocking coolant flow to the heater core, keeping it from generating the heated air in the car. Once that's done, reattach the heater core hoses, top off coolant, and burp the system again.

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Heater blow cold air in my 1994 Honda Accord (4


Yes clogged heater core may be the answer in your case .


Dec 11, 2009 | 1994 Honda Accord

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My heat or my air doesn't work in my 1995 Pontiac Bonneville but it blows good. What could be the issue?


my 2004 pontaic bonneville the heater hoses going into and out from the heater core are hot , but the heater blow cold air. ,

Oct 16, 2009 | Pontiac Bonneville Cars & Trucks

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Heater in 1984 Bronco blows cold.


There may be a few reasons for this - just check them all in turn.

  1. Low coolant - Check your expansion bottle.
  2. Airlock in heater matrix - Can you hear trickling water sometimes, have you changed the coolant or had to top-up? - Bleed the air out through bleed valve or loosen a hose while engine is running.
  3. Faulty heater valve. This can actually be the link to control the heater valve rather than the valve itself. - How does the hot/ cold switch feel? - is it very loose ? Sometimes the valve gets stiff, and the next time it is moved, the control wire snaps. Often the valve needs replacing and the broken link to cure it. Not a major expense - just fiddly to do.
  4. Blocked heater matrix - from using radweld or similar quick-fixes. Replacement is better than flushing.

Jan 05, 2009 | 1984 Ford Bronco II

1 Answer

Heater blowing cold air


squeeze the hoses to get any air bubbles out and refill coolant as necesary. are you sure you put thermostat in the right way? may be backwards. also may be your sensor.

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1 Answer

Heater Blows cold air


You could have a blocked heater core. Check for two heater hoses running into the firewall in the back of your engine. They should be together and about 5/8" in diameter. If one is hot and the other is cooler then your heater core is blocked. Unhook both hoses and use a garden hose to back flush. Be sure to catch the coolant and dispose of it properly.

Jan 03, 2009 | 2001 Chevrolet Monte Carlo

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