Heater refuses to blow hot!
Posted
#1582984
(In Topic #214842)
Settled In
Hi
Whatever I seem to do I can't get warm air into the car.
Plenty of coolant in the system, Changed the heater valve already so I know it's not that, any ideas what else I can try?
Starting to think a air (or an actual blockage) in the heater matrix but any others would be great!
Tried running the engine with the cap off but this doesn't seem to have sorted it…
Thanks
Adam
Whatever I seem to do I can't get warm air into the car.
Plenty of coolant in the system, Changed the heater valve already so I know it's not that, any ideas what else I can try?
Starting to think a air (or an actual blockage) in the heater matrix but any others would be great!
Tried running the engine with the cap off but this doesn't seem to have sorted it…
Thanks
Adam
Posted
Local Hero
Do the hoses get hot going to the heater?
You can see the hoses in the engine bay going into the bulkhead, inlet and outlet.
You can see the hoses in the engine bay going into the bulkhead, inlet and outlet.
1988 Mk1 Golf GTi Cabriolet 1.8cc DX, K-jet. Daily drive. 317,000 miles and counting
1978 Mk1 Scirocco GLS 1.6cc FR, Webber carb. Weekend toy.
1978 Mk1 Scirocco GLS 1.6cc FR, Webber carb. Weekend toy.
Posted
Settled In
They get warm (but not as warm as the radiator pipes) - possibly getting warm from ambient heat maybe?
Posted
MOTY 2013
try manually opening the valve in the bay so you know its fully open. the matrix might be blocked?
the system should self bleed, but this bleeding method never fails me:
http://clubgti.com/showthread.php?145091
the system should self bleed, but this bleeding method never fails me:
http://clubgti.com/showthread.php?145091
Hello my name is John and I'm a dub addict.
My wiring diagrams and other documents have moved here:
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My wiring diagrams and other documents have moved here:
VAG Documents & Downloads
You'll need to sign into google/gmail for the link to work! (its free!)
Posted
Local Hero
low temp thermostat installed.
heater valve that is maladjusted, not fully opening.
The valve arm isn't against the stop.
Broken heater valve internally.
Clogged heater core (matrix).
You can use hose pinch pliers an clamp off the heater hoses.
Disconnect them from the Valve, and the butt-to-butt connector on the lower (best to replace that with a barbbed brass hose or steel connector if yours is plastic.
at the upper hose, fill it with 1/4 cup of CLR (Calcium Lime Rust) remover,,,, Strong vinegar works let it work for about 20 minutes.
Take a Garden hose, and flush it from the top to it exiting the bottom hose till it runs clear.
Reverse the hose and flush it from the bottom to the top.
Repeat the flush top flush bottom about 4-5 times till water runs clear….
Reconnect the hoses and top off coolant, you should be good to go….
The original matrix will burn your butt out of the car.
The A/C units are a tad harder to replace than the non-a/c units….and if yours isn't a a/c unit. I would think on removing it to flush and back flush..
In the Archive section I have a link in my how-to's on beefing up the heater valves…
heater valve that is maladjusted, not fully opening.
The valve arm isn't against the stop.
Broken heater valve internally.
Clogged heater core (matrix).
You can use hose pinch pliers an clamp off the heater hoses.
Disconnect them from the Valve, and the butt-to-butt connector on the lower (best to replace that with a barbbed brass hose or steel connector if yours is plastic.
at the upper hose, fill it with 1/4 cup of CLR (Calcium Lime Rust) remover,,,, Strong vinegar works let it work for about 20 minutes.
Take a Garden hose, and flush it from the top to it exiting the bottom hose till it runs clear.
Reverse the hose and flush it from the bottom to the top.
Repeat the flush top flush bottom about 4-5 times till water runs clear….
Reconnect the hoses and top off coolant, you should be good to go….
The original matrix will burn your butt out of the car.
The A/C units are a tad harder to replace than the non-a/c units….and if yours isn't a a/c unit. I would think on removing it to flush and back flush..
In the Archive section I have a link in my how-to's on beefing up the heater valves…
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They all start with GOOD Grounds.
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