Question about 1997 Volkswagen Golf

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No heater after thermostat replacement

Also discovered oil leak

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Thermostat is in backwards. place the spring side toward the engine.

Posted on Mar 26, 2009

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Also could be an air pocket in cooling system if heater worked before thermostat was replaced

Posted on Jan 28, 2009

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  • 53 Answers

You have a plugged Heater Core. As far as the Oil Leak goes, this could be caused by numerous problems. Could come from many places on the engine.

Posted on Jan 20, 2009

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How to change the thermostat house in a Dodge 2004 intrepid


Check this procedure for...
2.7L Engine
  1. Disconnect negative cable.
    CAUTION Do not remove pressure cap with the system hot and under pressure because serious burns from coolant can occur.
  2. Drain cooling system.
  3. Remove radiator lower hose from thermostat housing.
  4. Remove nuts from heater tube flange studs.
  5. Loosen starter bolt at heater tube bracket.
  6. Pull heater tube out of thermostat housing and position out of the way.
  7. Remove bolt and two studs.
  8. Remove thermostat housing, O-ring and thermostat.
  9. Remove thermostat housing bolts.
To install:
  1. Clean gasket sealing surfaces.
    NOTE Install thermostat with the bleed valve located at the 12 o'clock position, between tabs on seal.
  2. Install thermostat and seal into thermostat housing .
  3. If removed, install two studs.
  4. Install thermostat, thermostat housing and O-ring and bolt. Tighten attaching bolts to 105 inch lbs.(12 Nm).
  5. Lubricate new heater return tube O-ring with coolant.
  6. Position heater return tube flange over two studs. Install nuts.
  7. Tighten retaining nuts to 53 inch lbs.(6 Nm).
  8. Tighten starter bolt to 40 ft. lbs. (54.3 Nm).
  9. Connect the lower radiator hose to the thermostat housing. Install hose clamps.
  10. Refill cooling system.
  11. Inspect for leaks.
  12. Connect negative cable.

3.2L & 3.5L Engines
  1. Disconnect negative cable.
    CAUTION Do not remove pressure cap with the system hot and under pressure because serious burns from coolant can occur.
  2. Drain cooling system.
  3. Raise vehicle on hoist.
  4. Disconnect electrical connectors from engine oil and power steering pressure switches.
  5. Disconnect radiator and heater hoses from thermostat housing.
  6. Remove thermostat housing bolts.
  7. Remove housing, thermostat, and gasket.
    NOTE The OEM thermostat is staked in place at the factory. To ensure proper seating of replacement thermostat, carefully remove the bulged metal from the thermostat housing using a suitable hand held grinder. It is not necessary to restake the replacement thermostat into the thermostat housing.
To install:
  1. Position gasket on thermostat and housing.
  2. Install thermostat housing, gasket and mounting bolts onto block. Tighten attaching bolts to 105 inch lbs. (12 Nm).
  3. Install radiator hose.
  4. Install bypass hose.
  5. Connect electrical connectors from engine oil and power steering pressure switches.
  6. Connect negative cable.
  7. Fill cooling system.
  8. Inspect for leaks.
  9. Lower vehicle on hoist.

Hope helps (remember to rate and comment thius answer).

Apr 28, 2011 | 2004 Dodge Intrepid

3 Answers

1994 v6 Firebird I have overheating issues recently, replaced hoses, cooling fan and radiator. It seems to be circulating from water pump. I do not know which way to turn now, no leaks that I see only when...


Water pump might not be flowing fast enough. Be sure fans actually turn on instead of just sitting there. Change oil. You could have something in the motor causing excessive heat. Piston friction or cam problems ect. Try a synthetic oil.

Mar 01, 2011 | 2001 Pontiac Firebird

1 Answer

I had a block heater installed [which stopped working ] and now it is overheating and heater is not working at idle, only when vehicle is above 1800 rpm. Did the block heater replace the thermostat and if...


First thing you need to do is check the coolant level. If low, the heater will not work properly. Next, check for leaks, especially at the block heater because that's the last item worked on before your problem began. I've never seen any block heater that installs in place of a thermostat. The thermostat needs to be there for the computer to determine what mode is should be in. Most block heaters are installed in a freeze plug opening, in place of the plug (on one side of the block). if the engine has overheated, thermostats can become unreliable after that happens so regardless of the reason for the overheat, replace it. (cheap insurance against future problems). don't forget to check everything for leaks...it is possible that something else is leaking. There are some heaters that are a pad glued to the bottom of the oil pan...If that's the kind you have, it can't cause a problem like yours...they aren't used much because they aren't as efficient and can be easily be damaged.

Nov 30, 2010 | 1998 Jeep Cherokee

1 Answer

How to change the thermostat


This is for the 2.7L:

2.7L Engine
  1. Disconnect negative cable.

    CAUTION

    Do not remove pressure cap with the system hot and under pressure because serious burns from coolant can occur.

  2. Drain cooling system.
  3. Remove radiator lower hose from thermostat housing.
  4. Remove nuts from heater tube flange studs.
  5. Loosen starter bolt at heater tube bracket.
  6. Pull heater tube out of thermostat housing and position out of the way.
  7. Remove bolt and two studs.
  8. Remove thermostat housing, O-ring and thermostat.
  9. Remove thermostat housing bolts.

To install:

  1. Clean gasket sealing surfaces.

    NOTE

    Install thermostat with the bleed valve located at the 12 o'clock position, between tabs on seal.

  2. Install thermostat and seal into thermostat housing .
  3. If removed, install two studs.
  4. Install thermostat, thermostat housing and O-ring and bolt. Tighten attaching bolts to 105 inch lbs.(12 Nm).
  5. Lubricate new heater return tube O-ring with coolant.
  6. Position heater return tube flange over two studs. Install nuts.
  7. Tighten retaining nuts to 53 inch lbs.(6 Nm).
  8. Tighten starter bolt to 40 ft. lbs. (54.3 Nm).
  9. Connect the lower radiator hose to the thermostat housing. Install hose clamps.
  10. Refill cooling system.
  11. Inspect for leaks.
  12. Connect negative cable.
This is for the 3.2L and the 3.5L:

3.2L & 3.5L Engines
  1. Disconnect negative cable.

    CAUTION

    Do not remove pressure cap with the system hot and under pressure because serious burns from coolant can occur.

  2. Drain cooling system.
  3. Raise vehicle on hoist.
  4. Disconnect electrical connectors from engine oil and power steering pressure switches.
  5. Disconnect radiator and heater hoses from thermostat housing.
  6. Remove thermostat housing bolts.
  7. Remove housing, thermostat, and gasket.

    NOTE

    The OEM thermostat is staked in place at the factory. To ensure proper seating of replacement thermostat, carefully remove the bulged metal from the thermostat housing using a suitable hand held grinder. It is not necessary to restake the replacement thermostat into the thermostat housing.

To install:

  1. Position gasket on thermostat and housing.
  2. Install thermostat housing, gasket and mounting bolts onto block. Tighten attaching bolts to 105 inch lbs. (12 Nm).
  3. Install radiator hose.
  4. Install bypass hose.
  5. Connect electrical connectors from engine oil and power steering pressure switches.
  6. Connect negative cable.
  7. Fill cooling system.
  8. Inspect for leaks.
  9. Lower vehicle on hoist.

Nov 01, 2010 | 2002 Dodge Intrepid

3 Answers

I have coolant smell and mist inside cab. Will radiator flush and coolant replace, thermostat replace solve this problem? If not what is the cause and remedy?


Hi it sounds to me like the thermostat has packed up and this has caused pressure to build up in the coolant system then this has caused the heater matrix to blow, this is located behind the dashboard and is a nightmare to replace as the dash has to come out to get to it.

the heater matrix is the only part that can cause coolant to get inside the car so this is the most likely cause. usually its the thermostat failing that causes this but you need to bare in mind that the head gasket failing can cause the same symptoms

the first thing i would do is take the thermostat out and then pour some boiling water into a tub then have a look at the thermostat in its closed position then put the thermostat into the boiled water and leave it in their for 3 or 4 min then take it out if it has then opened up then the chances are your head gasket has gone and your engine will need replacing, if it stays in closed position then you will find that its just the thermostat that has gone and you will also need to replace the heater matrix, this is a big job and you will need a haynes workshop manual if your doing the work yourself as their is loads to do.

if you google how to tese thermostat you will find sites that will show you how and explain what i just told you so have a look and you will see what i mean on testing the thermostat it easy to do and it will then tell you if its the thermostat or the head gasket that has failed.

if the thermostat stays shut then it is no good and the head gasket should be ok.

if the thermostat opens then this is bad news and you will need to get the head gasket changed.

let me know how you get on or if you need further assistance ok

plz rate this solution as i have a whole page on unrated posts, thanks

Aug 27, 2010 | Chevrolet S 10 Cars & Trucks

1 Answer

Remove thermostat


300M, Concorde, Intrepid, LHS, 1998-2004
THERMOSTAT - Removal & Installation

2.7L Engine
  1. Disconnect negative cable.
    CAUTION Do not remove pressure cap with the system hot and under pressure because serious burns from coolant can occur.
  2. Drain cooling system.
  3. Remove radiator lower hose from thermostat housing.
  4. Remove nuts from heater tube flange studs.
  5. Loosen starter bolt at heater tube bracket.
  6. Pull heater tube out of thermostat housing and position out of the way.
  7. Remove bolt and two studs.
  8. Remove thermostat housing, O-ring and thermostat.
  9. Remove thermostat housing bolts.

To install:
  1. Clean gasket sealing surfaces.
    NOTE Install thermostat with the bleed valve located at the 12 o'clock position, between tabs on seal.
  2. Install thermostat and seal into thermostat housing .
  3. If removed, install two studs.
  4. Install thermostat, thermostat housing and O-ring and bolt. Tighten attaching bolts to 105 inch lbs.(12 Nm).
  5. Lubricate new heater return tube O-ring with coolant.
  6. Position heater return tube flange over two studs. Install nuts.
  7. Tighten retaining nuts to 53 inch lbs.(6 Nm).
  8. Tighten starter bolt to 40 ft. lbs. (54.3 Nm).
  9. Connect the lower radiator hose to the thermostat housing. Install hose clamps.
  10. Refill cooling system.
  11. Inspect for leaks.
  12. Connect negative cable.

3.2L & 3.5L Engines
  1. Disconnect negative cable.
    CAUTION Do not remove pressure cap with the system hot and under pressure because serious burns from coolant can occur.
  2. Drain cooling system.
  3. Raise vehicle on hoist.
  4. Disconnect electrical connectors from engine oil and power steering pressure switches.
  5. Disconnect radiator and heater hoses from thermostat housing.
  6. Remove thermostat housing bolts.
  7. Remove housing, thermostat, and gasket.
    NOTE The OEM thermostat is staked in place at the factory. To ensure proper seating of replacement thermostat, carefully remove the bulged metal from the thermostat housing using a suitable hand held grinder. It is not necessary to restake the replacement thermostat into the thermostat housing.

To install:
  1. Position gasket on thermostat and housing.
  2. Install thermostat housing, gasket and mounting bolts onto block. Tighten attaching bolts to 105 inch lbs. (12 Nm).
  3. Install radiator hose.
  4. Install bypass hose.
  5. Connect electrical connectors from engine oil and power steering pressure switches.
  6. Connect negative cable.
  7. Fill cooling system.
  8. Inspect for leaks.
  9. Lower vehicle on hoist.

Hope this help (remember comment and rated this).

Apr 04, 2010 | 2000 Chrysler Concorde

1 Answer

How to replace thermostat


300M, Concorde, Intrepid, LHS, 1998-2004 - Thermostat Removal & Installation 2.7L Engine
  1. Disconnect negative cable.
    CAUTION Do not remove pressure cap with the system hot and under pressure because serious burns from coolant can occur.
  2. Drain cooling system.
  3. Remove radiator lower hose from thermostat housing.
  4. Remove nuts from heater tube flange studs.
  5. Loosen starter bolt at heater tube bracket.
  6. Pull heater tube out of thermostat housing and position out of the way.
  7. Remove bolt and two studs.
  8. Remove thermostat housing, O-ring and thermostat.
  9. Remove thermostat housing bolts.
To install:
  1. Clean gasket sealing surfaces.
    NOTE Install thermostat with the bleed valve located at the 12 o'clock position, between tabs on seal.
  2. Install thermostat and seal into thermostat housing .
  3. If removed, install two studs.
  4. Install thermostat, thermostat housing and O-ring and bolt. Tighten attaching bolts to 105 inch lbs.(12 Nm).
  5. Lubricate new heater return tube O-ring with coolant.
  6. Position heater return tube flange over two studs. Install nuts.
  7. Tighten retaining nuts to 53 inch lbs.(6 Nm).
  8. Tighten starter bolt to 40 ft. lbs. (54.3 Nm).
  9. Connect the lower radiator hose to the thermostat housing. Install hose clamps.
  10. Refill cooling system.
  11. Inspect for leaks.
  12. Connect negative cable.
3.2L & 3.5L Engines
  1. Disconnect negative cable.
    CAUTION Do not remove pressure cap with the system hot and under pressure because serious burns from coolant can occur.

  2. Drain cooling system.
  3. Raise vehicle on hoist.
  4. Disconnect electrical connectors from engine oil and power steering pressure switches.
  5. Disconnect radiator and heater hoses from thermostat housing.
  6. Remove thermostat housing bolts.
  7. Remove housing, thermostat, and gasket.
    NOTE The OEM thermostat is staked in place at the factory. To ensure proper seating of replacement thermostat, carefully remove the bulged metal from the thermostat housing using a suitable hand held grinder. It is not necessary to restake the replacement thermostat into the thermostat housing.
To install:
  1. Position gasket on thermostat and housing.
  2. Install thermostat housing, gasket and mounting bolts onto block. Tighten attaching bolts to 105 inch lbs. (12 Nm).
  3. Install radiator hose.
  4. Install bypass hose.
  5. Connect electrical connectors from engine oil and power steering pressure switches.
  6. Connect negative cable.
  7. Fill cooling system.
  8. Inspect for leaks.
  9. Lower vehicle on hoist.

Hope helps with this (remember rated this) Good luck.

Feb 02, 2010 | 2001 Chrysler 300M

1 Answer

Not heating inside car


One or more of:

1. Your coolant level is low
2. Your thermostat doesn't close and needs to be replaced
3. The valve from the cooling system to the heater core is stuck
4. Your heater core is clogged

Dec 27, 2009 | 2003 Saturn VUE

1 Answer

I need to know where the location of the thermostat is on a 1999 chrysler 300m so i can replace


The 2.7L engine lower radiator hose, connects to the thermostat housing.

To Remove:
1.Disconnect the Negative battery cable.
(Engine COLD!)
  1. Drain cooling system.
  2. Remove radiator lower hose from thermostat housing.
  3. Remove nuts from heater tube flange studs.
  4. Loosen starter bolt at heater tube bracket.
  5. Pull heater tube out of thermostat housing and position out of the way.
  6. Remove bolt and two studs.
  7. Remove thermostat housing, O-ring and thermostat.
  8. Remove thermostat housing bolts.
To install:
A.Clean gasket sealing surfaces.
B.Install thermostat with the bleed valve located at the 12 o'clock position, between tabs on seal.
  1. Install thermostat and seal into thermostat housing .
  2. If removed, install two studs.
  3. Install thermostat, thermostat housing and O-ring and bolt. Tighten attaching bolts to 105 inch lbs.(12 Nm).
  4. Lubricate new heater return tube O-ring with coolant.
  5. Position heater return tube flange over two studs. Install nuts.
  6. Tighten retaining nuts to 53 inch lbs.(6 Nm).
  7. Tighten starter bolt to 40 ft. lbs. (54.3 Nm).
  8. Connect the lower radiator hose to the thermostat housing. Install hose clamps.
  9. Refill cooling system.
  10. Inspect for leaks.
  11. Connect negative cable.
3.2 and 3.5L engines:
Disconnect the battery cable. (Again engine COLD)
  1. Drain cooling system.
  2. Raise vehicle on hoist.
  3. Disconnect electrical connectors from engine oil and power steering pressure switches.
  4. Disconnect radiator and heater hoses from thermostat housing.
  5. Remove thermostat housing bolts.
  6. Remove housing, thermostat, and gasket.
The OEM thermostat is staked in place at the factory. To ensure proper seating of replacement thermostat, carefully remove the bulged metal from the thermostat housing, using a suitable hand held grinder. It is not necessary to restake the replacement thermostat, into the thermostat housing.

To Install:
  1. Position gasket on thermostat and housing.
  2. Install thermostat housing, gasket and mounting bolts onto block. Tighten attaching bolts to 105 inch lbs. (12 Nm).
  3. Install radiator hose.
  4. Install bypass hose.
  5. Connect electrical connectors from engine oil and power steering pressure switches.
  6. Connect negative cable.
  7. Fill cooling system.
  8. Inspect for leaks.
  9. Lower vehicle on hoist.
From AutoZone Repair Guides

I feel this way, I can give you an accurate description, and have taken into account your safety.

May 12, 2009 | 1999 Chrysler 300M

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