Question about 1988 Chevrolet S-10

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1987 s-10 2.5 engine idles too fast

Think the vacuum hoses are not hooked up correctly. Diagram on fan shroud not legible. Maybe hooked up incorrectly.

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I would check for a vacuum leak first. you can start the vehicle and spray starting fluid on the vacuum lines. If the Idle raises then you have a vacuum leak. NOTICE: do not spray starting fluid around or on hot engine parts or electrical elements, starting fluid has a very low flash point and will ignite very easily.

Posted on May 10, 2009


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If you lost a vacuum line then the heater would let hot air out the vents with or without the fan motor running. Do this test with the engine up to operating temperature Touch both hoses with the heater on and temp control to the hottest position. Now check the temperature of both hoses. They should be the same. If not that indicates a blockage of water to the heater core. Test the water flow valve too. It can be plugged with rust or not moving to let water into the core. The core itself can be plugged too. If you really need a hose diagram, a Chilton's manual will be your source of information. The engine won't idle well with a vacuum hose off.

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How do I hook up my vacuum hoses

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I need a vacuum diagram for a 1978 toyota corolla with a 2tc engine. The one from my engine hood is not legible anymore. Thanks

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I need to reconnect my radiator in my 2000 ls v8

For 2000 Lincoln LS 3.9L SFI DOHC 8cyl...
Radiator - Removal & Installation
  1. Drain the engine cooling system.
  2. Remove the upper radiator sight shield.
  3. Remove the air cleaner outlet tube.
  4. Remove the six bolts and the two radiator upper support brackets.
  5. Remove the upper radiator hose.
  6. Remove the bolt and position the receiver drier aside.
  7. Disconnect the dual flow coolant valve electrical connector and the A/C line from the fan shroud.
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  10. Remove the bracket.
  11. 3.9L engines only:
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  13. Inspect the seal and install a new seal if necessary.
  14. Disconnect the return hose from the cooling fan and shroud.
  15. Separate the return hose from the fan shroud and position aside.
  16. Remove the two bolts and the fan shroud assembly.
  17. Remove the A/C condenser.
  18. Remove the two bolts and position the multi-cooler assembly aside.
  19. Remove the bolts and the condenser support brackets.
  20. Remove the radiator.

To install:
  1. Install the following:

    Radiator Condenser support brackets Multi-cooler assembly A/C condenser Fan shroud assembly
  2. Connect the return hose to the fan shroud
  3. Connect the high pressure cooling fan bracket and line.
  4. 3.9L engines only:
    Replace the bolt and position the electric water pump aside.
  5. 3.0L engines only:
    Connect the Throttle Position (TP) sensor and the Idle Air Control (IAC) valve electrical connectors.
  6. Replace the following
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Hope help with this (remember rated and comment this).

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How to remove a radiator from a 1988 cadillac seville

1988 Cadillac Seville 4.5L TBI 8cyl Repair Guide

On the 8-250 and 8-273 engines use only a coolant solution specifically designed for use in aluminum engines.
  1. Disconnect the battery ground cable.
  2. Drain the cooling system.
  3. Disconnect the air conditioning compressor, if so equipped, and position it out of the way without disconnecting the hoses.
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  5. Loosen the hose clamps and disconnect the upper and lower radiator hoses.
  6. Disconnect the two transmission cooler lines and plug them.

Disconnect the heater return hose, if so equipped.
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  2. Remove the vacuum hoses, if so equipped. Mark them for proper installation.
  3. Pull the radiator straight up and out of the car.
  4. Reverse the above procedure for installation.


Fig. 1: Radiator fan shroud mounting - diesel sedans, gasoline-engined cars similar


Fig. 2: Some radiator fan shrouds mount like this

Fig. 3: Common coolant recovery tank, mounted on the inner fender

Fig. 4: Removing the support bolt - radiator removal

Fig. 5: Removing the support - radiator removal

Fig. 6: Removing the radiator metal cover bolt - radiator removal

Fig. 7: Removing the radiator metal cover - radiator removal

Fig. 8: Removing the radiator overflow hose

Fig. 9: Removing the transmission oil cooler lines - radiator removal

Fig. 10: Removing the radiator

Fig. 11: Removing the hose from the radiator fan shroud

Fig. 12: Removing the power steering tank bolts from the radiator fan shroud

Fig. 13: Removing the power steering tank from the radiator fan shroud

Fig. 14: Removing a common radiator fan shroud

I really hope help with this (remember rated and comment this).

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1 Answer

1991 S10 2.5L throttle body idles to fast

A vehicle that old will suffer from brittle and cracked vacuum lines. I would say there is a bad, or several bad lines leaking away vacuum from the intake manifold. Don't forget to check the hose going to the PCV on the valve cover. A vacuum leak will also cause the engine to stumble and miss intermittently when idling.

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2003 Ford Ranger 2.3 Diagram

 rough-idling engine can signal a number of positive crankcase ventilation (PCV) valve problems, such as a clogged valve or a plugged hose. But before beginning the functional checks, double check the PCV valve part number to make certain the correct valve is installed. If the correct valve is being used, continue by disconnecting the PCV valve from the valve cover, intake manifold, or hose. Start the engine and let it run at idle. If the PCV valve is not clogged, a hissing is heard as air passes through the valve. Place a finger over the end of the valve to check for vacuum.


With the engine at idle, vacuum should be felt at the PCV valve. 


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