temp please help

[mark78]

when driving in this cold weather noticed my temp guage sitting nearly on the red so turn heat on full inside car and it went back to normal have changed temp sender and thermo. recently it has done this a few times and when i put heat on full it goes back to 90 any ideas please

[kite]

Do the fans cut in ?
does the waterpump work..

[mark78]

not sure about fans have car ticking over now to check im nearly sure water pump was replaced with timing belt not that long ago

[808]

Sounds like the fan to me if yr getting hot air in the cabin. If the water pump was gone u wouldnt have hot air inside for very long. Let the car warm up and listen for the fan to kick in. Dont let it get to hot.

[mark78]

the air into the cabin is really hot there is a fan that runs all the time just waitin on other one kicking in car takin ages to heat now its bloody freezin out there

[kite]

Turn the aircon off to stop the fan, run the engine at fast idle to get some heat into it...

[808]

If its a diesel you shouldnt just let it run on the drive to warm up. It should be started and driven (according to VW). Once up to temp it can be left running on the drive.

[mark78]

the other fan is stayin on no matter wat i turn off lol the top hose isnt gettin that warm either

[mark78]

had car ticking over for about six months now or a couple of hours and temp sittin at 90 seems to only do it while driving would it be anything to do with very cold weather

[martin1810]

If it only does it when you drive I would say the water pump has failed. Heat is circulating on it's own when ticking over but when you drive this isn't enough and the water pump has lost it's push. It's fairly common, especially on the plastic vane pumps.

[mark78]

cheers m8 will try and make it do til after xmas need it for work as i use it as a taxi

[mark78]

would this def be water pump as i dont want to replace it and still be over heating there is always heat in the cabin and it only overheats wen driving then wen i turn heater on full it goes back to normal just want to check before i replace timing belt kit and water pump

[martin1810]

No way to know for sure. An internally collapsed hose or a partially blocked radiator would produce similar results. The water pump is a well known problem though. You could try feeling the radiator to see if it gets hot evenly all over. Good luck.

[mark78]

its not the water pump back to square 1

[martin1810]

I've lost track. Have you changed the thermostat yet. That might be stuck mostly shut.

[mark78]

lost track too m8 yeah changed temp sensor and thermostat not that long ago and now water pump and timing belt

[martin1810]

Looks like you are running out of options. Only hoses and radiator left. Can you get someone to shine an Infra Red thermometer onto the radiator to see if it is heating up evenly.

[mark78]

will try that m8 cheers for your help

[mark78]

think i will have to try a radiator cant get anyone that can check temp of mine and i dont think there is much left to try there is a plastic part below the water tank that the hose that comes from water tank goes into does anyone know wat this is or wat it does will try anything now

[mark78]

got a new radiator fitted fingers crossed it does the trick so far so good