Passat won t start when hot

One of the most common and inconvenient problems with the Volkswagen Passat is when it has no heat coming from the heater. Not having a functioning heater makes driving much less comfortable, and can be a sign of certain issues. At the simplest level, there are two main reasons why the heater is not working. If the heat is blowing, but blowing cold, it has something to do with the coolant getting to the heater core, or the heater core itself.

At the simplest level possible, the heater works by passing hot coolant from the engine into a tiny radiator called the heater core. At this point, the blower motor blows air across the it and the newly heated air blows on to the driver and passengers.

If the heater has stopped working in your Passat, this process has failed in one way or another. There is almost never a situation where you would need to take the radiator cap off of the radiator to add coolant.

The exception to that would be when you would have reason to believe that the hose going from the reservoir to the radiator is clogged. While not having enough coolant may make your engine run hotter, it can also cause your Passat to not be able to create enough heat.

You can verify this by checking the coolant level by taking a peek at the overflow reservoir. The overflow reservoir will be connected to the radiator by a tube coming from the top usually right by the radiator cap.

VW 2.0 TDI 140 wont start when warm

Some vehicles only have full hot. It does this by allowing water to enter the engine when it is getting hot, and by keeping coolant from entering while the vehicle warms up.

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Sometimes when a thermostat goes bad, it stays stuck open. This allows the coolant to continuously enter the engine. If your Passat has a built in temperature gauge, take a look at it and see if it is in the spot it is normally in after a bit of driving. The heater core itself can go bad.

Over time, they are known to clog and fail. Without the warm coolant going through it, there can be no heat. A bad heater core can also leak, so watch out for that. There are two hoses coming to and from the heater core.Forums New posts Search forums.

VW Passat 2.0T Cranks, but doesn't start.

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Search forums. Log in. For a better experience, please enable JavaScript in your browser before proceeding. Passat won't start in hot weather. Thread starter Jesse Falsone Start date Jul 11, Jesse Falsone Well-known member. I suppose it's the ignition, but I thought I had better solicit some opinions before spending the dough.

passat won t start when hot

The starter has been replaced already. Any ideas? Failing this, I don't suppose it could be your fuel system losing prime? Usually hard starting hot is in no particular order Starter Battery timing especially if smoke on startup.

I assume by "hard starting" you mean it cranks for more than 1 revolution prior to catching. I'd have the battery checked, since it's cheap and easy to do.Forums New posts Search forums.

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passat won t start when hot

Log in Register. Search titles only. Search Advanced search…. New posts. Search forums. Log in. For a better experience, please enable JavaScript in your browser before proceeding. Thread starter demhaizar Start date Apr 18, Hello all, Let me give a history, Thanks for reading my post!!

Readiness: 0 0 0 0 1 Address Auto Trans Labels: 01V Labels: 1C End Last edited: Apr 18, QuickTD Veteran Member. Low cranking speed can cause hot starting problems. Try boosting the car from another vehicle, if starting improves the battery, cables or possibly starter may be suspect.

Passat won't start in hot weather

Cranking speed should be rpm or higher using vcds logging. Cam position sensor can cause long crank times but the engine will eventually start, synchronization value in VDCS will be less than May or may not set a code. Vcds logs of the appropriate blocks will tell a better story. Cam timing can cause long crank or no start if bad enough.

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Torsion value should be in the range of I find Gummed up anti-shudder valve will cause strange sounding fast crank and no start but should set a code. I'm sure others will have more ideas Fuel issue?

passat won t start when hot

Mikey2 Veteran Member.Search your problem. Related problems:. Top problems. Fuel tank Won't start Starting. This just started about a month ago. Car starts normally until i buy fuel petrol into the tank then it wont start till after like minutes. After which, everything becomes normal till next fueling. I suspected that the fuel tank could be dirty, but found it clean when it was opened recently.

Please someone should help with possible solution s. Comment Same issue here. Perhaps your fuel tank vent is pluged or clogged causing a vapor lock at fueling. Try starting after fueling with fuel tank cap loosely pleased on tank. Alarm Noise Won't start Starting. Once you turn the key the alarm keeps going off.

The car starts and knocks off right away. Sounds most likely a immobiliser fault or a problem with the key or transponder have it diagnosed. Exhaust Battery Won't start Starting. Occassionally refuses to fire. Plenty of battery power but won't start. When garage start with ethonol ran okay for a bit but I noticed white steam from exhaust. Now won't start again. Any ideas? It needs two starts in the morning but then it would start all. In the evening after parked for whole day it gives starting problems.

Anyone have got any ideas Battery Won't start Starting. I get in my car and start it up and drive off, 10 min down th road my car starts losing power and slowing down, I pulled over and turned the car off, then when I tried to start it again it wouldn't start the battery was flat.

Now my car won't start at all, please help. It's your airflow your turbo I had to get the auto elecktrition to Check myne cost me 80 to fix I was getting garages saying It's a 18 yr old Vw Passatt estate Tdi diesel I paid I am having problems with my passenger side wing mirror not heating up My drivers side just heats Up I have just returned from Vw smash it hunslet Google it And my garage in boroughbridge Is good as well Wayne Very reasonable Asenby.

I had my wing mirror Fitted at Vw smash it hunslet 2 hand They did a good job Vw smash it tel Number specialises In all German cars As some idiot the other night As I was waiting at the traffick lights Lights smashed it off Coming the other way I reported it to the police But because I could not give the name of the other vehicle did not give me much help and if I claimed on my insurance It goes up So bang there goes My lingerie money on a bloody wing mirror haha x.

Try having the charging system tested sounds like it may have been running on uthe battery power only. It's running great now I will get output eleck to find fault with Interior lights And why drivers side does not heat up mirror Thank you by a trusted garage Wayne. Starting Issue. Steering Noise Won't start Starting. Last week fault came related to steering lock issue. Now has been replaced new lock. But still car does not start at first time.

I have to push the key fob nothing happened and light stay still no crank noise.Original Poster. Search My Stuff What's New 3 12 24 Iklwa Original Poster posts 87 months.

Hi all I have a Passat 2. It turns over, but just wont take, and I then click the key out, put it back in, repeat 4 or 5 times, and eventually it starts.

I always wait for the light that shows the plugs are up to temp to go off, don't run anything electrical like air con or wipers etc, so cant figure out why it does this.

I would expect if it was a battery fault it would be consistently difficult to start, so does anyone have any ideas? It's a serious pain, and Im hoping it doesn't get worse. JollyGrnMonster posts months. If it were battery it would turn over slow. Sounds more like injector issue or crank sensor. Thanks for the ideas, have done a bit of googling and it seems it is quite common with VAG TDI's, and the garages don't seem to have a specific fix for it.

Might just have to live with it. SteBrown91 1, posts 87 months. Temp sensor somewhere?

passat won t start when hot

Best bet is to find someone with vagcom a d get it a scan. Could be the starter motor too. Id start with the temp sensor and take it from there. Same symptoms anyway, once hot trying to restart after a run or after fueling for example was hit and miss.

It would turn over but not fire. Theres a relay, on the mk4 its under the steering wheel in the fuse box. I forget what its number is, but its one of the main relays to actually get the car going. Next time it happens pop the cover off and see if you have a hot to touch relay, might be the culprit! SmithyAG posts 86 months. The 2.

It's a combination of lazy starter motor and bad software normally.R5 1400m Class: Maiden, Handicap 3:05PM Selections 1. R6 1000m Class: BM65, Handicap 3:40PM Selections 1.

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