Question about Ford Focus

2 Answers

In order to reach the PCV valve on my Ford Focus I had to remove a thermostat housing. Doing this casued radiator fluid to flow into the hole where the PCV valve sits. I installed the new valve, and now car idles rough, smells like rotten eggs. Could the water going into the hole where the valve sits caused this problem?

Posted by on


2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert who has answered 1,000 questions.

  • Ford Master
  • 2,486 Answers

The coolant could have gotten into the sump, change the oil and oil filter. If it spilt into the vacuum side of the pcv. valve it will have been sucked in to the cylinders via the inlet manifold , fouling spark plugs and oxygen censer.

Posted on Aug 31, 2014

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Top Expert:

    An expert who has finished #1 on the weekly Top 10 Fixya Experts Leaderboard.


    An expert that got 20 achievements.


    An expert that got 10 achievements.

  • Ford Master
  • 76,673 Answers

You need to drain the oil out and change the fliter of the engine as soon as possible, any coolant in the crankcase can damage the engine and make it run poorly.

Posted on Nov 05, 2010


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

2 Answers

Engine light is on the heater does not always throw warm air is it the thermostat and is it an easy fix?

Yes, it could be the thermostat, and yes it is pretty easy to fix. Here's how.

The location of the thermostat for most vehicle.

Stand in front of the car with the hood open, you'll see a black hose hooked to the upper side of the
radiator.( about 2 inch in diameter, newer vehicles about 1 and 1/2 inch, and newer small cars
about 1 and 1/4 inch. ) Follow the hose to the other end, it connects to the thermostat housing.
The thermostat is inside of the housing.( the hose usually goes to the air intake manifold, but some housings are on the side or back of the engine. )

How to test the thermostat in most vehicles;

Make sure the heater is off, start the engine and let it run for 6 to 8 minutes, ( this will allow the
engine to reach, " normal operating temperature "), from the inside of the vehicle turn the heater
temperature on high and turn the fan speed on high.
1. Listen very closely for a click sound from the engine, ( most thermostats make a click when
they open )
2. Watch your temperature guage, it should begin to lower as the coolant starts to circulate.
3. Usually within a few minutes the radiator fan will kick.

To replace the thermostat in most vehicles yourself;

Remove the hose from the housing, then remove bolts from the housing and lift the housing off
to access the thermostat. Pay attention to witch side is up on the thermostat that you remove, the
new one will have to go in the same way. Also look at the temperature rating that is stamped into
the thermostat that you take out, and make sure the new one has the same temperature rating.
(failure to do so can cause false readings by some sensors, and may start triggering error codes)

Install new thermostat, right side up, put housing back on and bolt back down, hook hose back on
to the housing. Check the coolant level. Start the engine and let it run for 6 to 8 minutes to reach,
"normal operating temperature", and look for any leaking. before you turn the engine off turn your
heater wide open and listen for a click. Most of the time when a thermostat opens you can hear a
click and may hear the coolant flowing through the system. Shut the engine off, wait for it to cool
down and then check your coolant level one more time. ( do not fill all the way up, only fill to
FULL line on resrvior.)

What the thermostat does;

It seperates your coolant into two parts. The first part is in your engine, the second part is in your
radiator and the coolant reservior. When the coolant in the engine reaches the temperature rating
on the thermostat the thermostat opens to allow the two parts of coolant to change places. Now
the cooled coolant in the radiator and reservior flows into the engine while the heated coolant flows
from the engine into the radiator and reservior to be air cooled by the radiator fan.

I hope this helps you.

Feb 02, 2011 | 1996 Mercury Grand Marquis

2 Answers

How do i bleed my thermostat on a 2002 buick century custom


Dec 19, 2010 | 2002 Buick Century

1 Answer

How to replace thermostat on ford f350 turbo diesel

The F-350 designation refers to a 1-ton Ford F-Series pickup truck. The thermostat in your diesel-powered Ford closes off the flow of coolant when the engine is cold, forcing the engine to heat up faster. When the coolant has reached a certain temperature, the thermostat opens up and the coolant flows as normal. A malfunctioning thermostat in your diesel may cause your engine to overheat if the thermostat gets stuck in the closed position. Installation of a new thermostat will cure the problem and get you back on the road

  • Open the hood. Allow the motor to cool off so that you will not be scalded by hot coolant. Locate the thermostat housing by tracing the upper radiator hose from the driver's side of the radiator to its termination at the thermostat housing.
  • 2 Remove the cap from the white plastic coolant bottle at the front of the engine bay. Place a drain pan under the radiator drain petcock on the lower side of the radiator on the driver's side of the truck. Remove the petcock by rotating it counterclockwise with a 19mm wrench. Replace the petcock and tighten it in a clockwise direction once the coolant has fully drained.
  • 3 Remove the clamps from both ends of the upper radiator hose with a pair of pliers. Pull the hose from the radiator and from the thermostat housing, using a twisting motion. Set the hose and clamps aside.
  • 4 Spray penetrating fluid on the three mounting bolts on the thermostat housing and let it soak in for a few minutes. Remove the three bolts with an 8mm wrench turned counterclockwise. Remove the thermostat housing from the water pump and set it and the bolts aside.
  • 5 Remove the thermostat housing from the water pump to reveal the thermostat. Carefully pry the thermostat up with a flat-blade

  • screwdriver if necessary. Clean the mating surfaces on the thermostat housing and at the water pump with a rag.
  • 6 Place a new thermostat into the water pump with the pointed end facing upward. Install a new O-ring gasket into the groove on the thermostat housing mating surface of the water pump. Position the thermostat housing back onto the water pump and tighten the three bolts with a torque wrench to 15 foot-lbs.
  • 7 Push the upper radiator hose back onto the radiator inlet and the thermostat housing until it is fully seated at both ends. Replace the hose clamps in their original position with a pair of pliers. Refill the coolant that you drained from the radiator back into the white plastic coolant tank and replace the cap. Start the engine and let it warm up. Check for leaks and retighten your connections if necessary

  • Dec 08, 2010 | 2004 Ford F350

    1 Answer

    Replacing the thermostat on a 2000 ford explorer 4.0

  • Place the drain pan under the drain valve on the radiator. Loosen the drain valve and allow the radiator fluid to drain. If the drain pan is clean, you can reuse the antifreeze.

  • Loosen the hose clamps on the upper radiator hose using a socket, screwdriver or pliers, depending on the type of hose clamp on the hose. Pull the hose off the radiator and thermostat housing. If the air filter intake hose is in the way, loosen the clamps and remove the intake hose (on some engines).
  • Unbolt the two bolts in the thermostat housings. Pry the thermostat housing off the engine block. Pull the thermostat out of the housing. Remove the old gasket and discard. Slide the new thermostat into the housing the same way the old one came out. Install the new O-ring seal in the housing. Coat the housing with a thin layer of silicone gasket maker. Allow the gasket maker to dry.
  • Slide the bolts into the thermostat housing, then line the bolts up to the bolt holes on the block. Slide the housing down the bolts until it touches the block. Turn the bolts in by hand to get them started. Tighten the bolts to 89 inch-pounds of torque.
  • Reinstall the upper radiator hose. Tighten the radiator drain plug. Fill the cooling system. Start the engine with the radiator cap off. Allow the engine to come up to operating temperature. Look for leaks. Watch the level of the water in the radiator. Fill as needed
  • Nov 24, 2010 | 2000 Ford Explorer

    2 Answers

    Where is the PCV valve on a 2000 Mercury Mystique 2.0?

    Here are some pictures showing where the pcv valve is located on the 2000 Mercury Mystique, 4 cylinder.

    First we see the engine compartment:
    Next we will see a closeup of the area circled in red.

    here I have outlined the PCV valve in red and the thermostat housing is circled in green. The pipe connected to the PCV is rigid metal. It is screwed to the motor, so you must remove the screw before you can pull on the pipe in order to extract the PCV valve. The screw is located underneath the thermostat housing, so the housing must be removed in order to get at the screw.
    The head of the screw is inside the orange circle. I had to use a torx bit. Yours may be a phillips head. Here are a couple of closeups:
    After I replaced the valve, my car was still surging at stoplights, so I started doing more troubleshooting. Lying under the car, looking at the side of the engine closest to the firewall, I saw a hole in a rubber tube. I crawled out and located this hose. If you follow the metal tube that the PCV valve is held in, you will find that it is inserted into a rubber hose after you get past the thermostat housing and it continues on to the back side of the engine. It turns out that this is the hose that I observed while lying on my back under the car. Apparently there is a bend in the hose and at that bend it fails due to heat buildup. Oh, well.

    When I went to the dealer, his 2000 Mystique diagrams did not show this part, but he made a guess and it was the right part. Make sure and take the one from your car to the dealership for comparison. After replacing the piece of hose, the car runs perfectly :) .

    Jun 28, 2010 | 2000 Mercury Mystique

    2 Answers

    1993 toyota camry change thermostat

    You're going to lose some coolant, so have a bucket or other container ready. Follow the upper radiator hose to the point where it's connected to the engine. The hose is clamped to a metal housing which is bolted to the engine. Remove the bolts (not the hose) and lift the housing to expose the thermostat (may require a little prying with a screwdriver or similar tool). Note how the old thermostat is fitted (which end is up), lift it out of the engine, and then remove all traces of gasket from the housing and the engine. Install the new thermostat and gasket, replace the bolts, add coolant as necessary, and you're done.

    Nov 05, 2009 | 1993 Toyota Camry V6

    1 Answer

    How to change a thermastat 1994 ford escort with a 1.9 engine

    1.9L Engine

    CAUTION Never open, service or drain the radiator or cooling system when hot; serious burns can occur from the steam and hot coolant. Also, when draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantities. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.
    1. Disconnect the negative battery cable.
    2. Drain the cooling system.
    3. Remove the air intake tube, crankcase breather and PCV hose.
    4. Remove the ignition coil pack and bracket.
    5. Remove the upper radiator hose.
    6. Remove the ignition coil pack bracket.
    7. Unfasten the heater hose inlet tube bracket bolt and remove the heater hose inlet tube from the thermostat housing.
    8. Remove the three thermostat housing attaching bolts, then remove the thermostat housing and gasket.

    Fig: Remove the ignition coil pack


    Fig. : Detach the air intake tube, crankcase breather and PCV hose

    Fig. : Disconnect the upper radiator hose from the radiator

    Fig. : Unfasten the ignition coil pack bracket upper bolts...


    Fig. : ...and the lower bracket bolt, then remove the bracket


    Fig. : Unfasten the heater hose inlet tube bracket bolt (arrow)


    Fig: Unfasten the heater hose inlet tube-to-thermostat housing clamp

    Fig.: Disconnect the hose inlet tube from the thermostat housing


    Fig. : Unfasten the three thermostat housing bolts


    Fig. Separate the thermostat housing from the engine block


    Fig. : Remove the thermostat from the housing


    Fig. : Use a scraper to clean old gasket material from the engine block's thermostat housing mating surface ...


    Fig. : ... as well as the thermostat housing


    Oct 29, 2009 | 1994 Ford Escort

    1 Answer


    Looking from the front of the car, start at the thermostat housing (where the top radiator hose goes) and go down from there. Located right next to the exhaust mannifold you'll see the hose going to the PCV valve.

    Oct 19, 2009 | 2002 Ford Escort

    1 Answer

    How to remove the thermostat

    Remove cap radiator when cold
    Drain radiator well below thermostat level.
    Disconnect rubberhose from thermostat housing to radiator. Do this at radiator side first cautious to prevent blocked fluid to run over engine . Undo radiator housing cover. Be sure to have new spare gasket. And right type new thermostat with corresponding temperature opening rating.
    Take out thermostat. Put new one in in the good position not reversed down (it opens at temperaturing pupping upwards. Check for presence of de-airation hole with little valve.
    Put gasket and cover . Tighten the bolts without killing them. Fill radiator to level. Leave a while do de-air leveling over that little hole valve in thermostat I mentioned. I necessarry fill again.

    Whilst doing this job be sure the seizure of old thermostat was not due to broken down cooling pump, broken radior fan with activating switch on engine block. At times they go together.

    Don't fill with pure water unless for backflushing system. Otherwise vapor bellows in th system will crack the engine block. Some hotspots exceed water vapor point!!

    Apr 18, 2009 | Chevrolet Venture Cars & Trucks

    2 Answers

    Thermostat replacement 2003 ford focus se, with 2.0, 16 valve ztech engine

    Follow the upper radiator hose to where it attaches to a housing (2bolts hold the housing in place) remove the hose clamp here and then remove the housing bolts, inside the housing is your thermostat. Clean off the surface of the housing, and where it attaches to the engine. Install the thermostat, and a new gasket (or O -ring ), carefully replace the housing, being sure the thermostat doesn't slip out of position, tighten the housing bolts, reattach the radiator hose to the housing, add coolant to proper level, check for leaks, u r good to go! Make sure the thermostat is installed in the right direction, if put in backwards the car will overheat. countrycurt0

    Oct 14, 2008 | 2003 Ford Focus

    Not finding what you are looking for?
    Cars & Trucks Logo

    Related Topics:

    165 people viewed this question

    Ask a Question

    Usually answered in minutes!

    Top Ford Experts


    Level 3 Expert

    76649 Answers

    Colin Stickland
    Colin Stickland

    Level 3 Expert

    22219 Answers


    Level 3 Expert

    5537 Answers

    Are you a Ford Expert? Answer questions, earn points and help others

    Answer questions

    Manuals & User Guides