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Vacuum to heating/cooling does not hold vacuum

Vacuum pump for 4wd & heating/cooling burnt out last trip. Replaced vacuum unit & found the heating/ cooling unit is not holding vacuum.

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  • Cars & Trucks Master
  • 75,814 Answers

Check all the connections for leaks.

Posted on Nov 02, 2012

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 39 Answers

SOURCE: 1995 gmc jimmy 4wd high not working

sounds like it is loosing vacuum check all the lines for a crack even the engine lines will cause it to loose vacc. pressure. if it is not run to the vacuum reserve canister you may not have enough vacc. to hold the actuator in several times I just run new lines and that helped and not very costly.

Posted on Dec 25, 2008

mattman2112
  • 57 Answers

SOURCE: In need of Vacuum hose diagram 1988 chevy 1500

run to autozone and buy a hayes muanual for your truck. i got one for every vehicle i own, they're great! (please rate my answer)

Posted on Feb 02, 2009

  • 11 Answers

SOURCE: heater problem / engine over heating 5.7 hemi 2004

Test for blown head gaskets, combustion gases can be tested at the radiator neck with engine running

Posted on Mar 11, 2009

lesabre1972
  • 474 Answers

SOURCE: 2001 jimmy overheating

I would have your head gaskets checked for leaks into cooling system and if ok try changing your water pump.

Posted on Mar 29, 2009

  • 5 Answers

SOURCE: replaced fuel pump & filter. relay is working

My 89 Cutlass had a strange starting problem too...During cold weather she would crank, but she would not start...I could heat up the top of the engine with a hair dryer and she would start....Shop finally fixed her, replaced the COIL, the old coil was no bueno in cold weather!!!!

Posted on Dec 11, 2009

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2003 f250superduty,4wd will engage if hubs are locked in will not engage when hubs are set to auto


Most common problem is a vacuum leak to the hubs. Check the lines from the vacuum pulsating solenoid all the way down to each hub connection. If the lines are good,use a vacuum pump to apply vacuum to the hub with the line removed. You should hear a slight click at about 5 inches of vacuum if the hub seals are good(test both hubs individually). Just one bad seal in either hub can cause the entire system to malfunction.

Feb 21, 2015 | 2003 Ford F250 Super Duty Crew Cab

1 Answer

Overheating


Ok, to review, it got hot climbing a mountain, and stayed cool going down the same mountain ?
Make sure the mechanic did replace the thermostat, and have somebody check the fan clutch. An exhaust restriction could also cause it to run hot under a load.
There is a small chance the water pump impeller is shot inside the water pump and not pushing the coolant thru the system.

Jun 29, 2012 | 1994 Ford Econoline

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2003 GMC Yukon XL: Will periodically stall at highway speeds during the summer (Houston hot). Forced to coast (on freeway) to a stop, wait 10-15 minutes for the Fuel Sending Unit (fuel pump) to cool...


Yeah what's you saying is right, and GM is having a big problem with Fuel Pump on such model, I Already saw a 2 Year Cobalt with a Dead Fuel Pump.. ! Best thing is Keep your tank more than the Quarter, Buy a Dealer Fuel Pump not a Jobber one, be sure the strainer is clean in the tank and check if there's any dirt in your Fuel tank ! Check too if there's any Recall about that on your Vehicle !

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F150, 4x4, 2005, Replace front wheel brgs.


there are no trick to this, they bolt right up, no press needed, the only tool is a snap ring pliers or just use a couple of picks,heres a diagram of the bearing, also if this truck has vacuum operated 4wd,take caution to remove the three bolts holding diapharm on rear of hub, also dissconect abs sensor,new bearing should come with new sensor,here are a couple of pictures to help.if you have 4wd with vacuum operation check the diaphram whil doing hub baering just hook vac pump to connection then apply vacuum and it will move in and should hold, if 4wd works fine then dont worry about that then, hope this helps,ddc32b1.gif8773598.gif5513d51.gif

Mar 26, 2010 | 2005 Ford F-150

1 Answer

Check 4wd light on


just found this worked a trick..mine stuck for two weeks in 2wd

A mere 2,400km into the life of my 07 Rodeo TD 4WD, I used 4L for about 2km of medium-steep/slippery track. After stopping and selecting 2WD the 'Check 4WD' light appeared, meaning I was stuck in 2WD for the rest of that trip. Luckily I was able to complete the trip in 2WD without incident.

The dealer blamed me for 'not following the instructions in the manual' (utter codswallop), 'fixed' it, and very reluctantly gave me a scribbled set of instructions on resetting the system, which I've included below.

When I suggested that these instructions should be included in the manual, the response was 'not necessary if owners use the system correctly'. More cods.

Here's how to reset it:

1. Ignition off, hold all 3 buttons (2H, 4H & 4L) in together

2. Switch ignition on to 'reds' position (last position before start)

3. Hold in this state for 30 seconds

Hope this may be of use !!

Dec 12, 2009 | 2004 Isuzu Rodeo

2 Answers

I just replaced the compressor, it has been


sounds like the first leak was not found . Need to bring it back in. And state that you should'nt have to pay again because it either is a defective replacement or the leak was not in the last compressor that was condemed.

Jul 23, 2009 | 2002 GMC Sierra

2 Answers

Hubs will not enguage when set to auto


the hubs on that truck are a vaccum controled hub, when the swithch is turned to 4x4 the vaccum control solenoid (on the fender) applys vaccum to the hub and locks- you can put a vaccum gauge on the hubs- if a leak is found thre is an o ring and an axle hub seal that needs to be replaced... if no leak is found at the hubs check the vac. lines and solenoid.goodluck

May 20, 2009 | 2003 Ford F250 Super Duty Crew Cab

4 Answers

It's a holden rodeo turbo/diesel 2005.check 4wd light on


A mere 2,400km into the life of my 07 Rodeo TD 4WD, I used 4L for about 2km of medium-steep/slippery track. After stopping and selecting 2WD the 'Check 4WD' light appeared, meaning I was stuck in 2WD for the rest of that trip. Luckily I was able to complete the trip in 2WD without incident.

The dealer blamed me for 'not following the instructions in the manual' (utter codswallop), 'fixed' it, and very reluctantly gave me a scribbled set of instructions on resetting the system, which I've included below.

When I suggested that these instructions should be included in the manual, the response was 'not necessary if owners use the system correctly'. More cods.

Here's how to reset it:

1. Ignition off, hold all 3 buttons (2H, 4H & 4L) in together

2. Switch ignition on to 'reds' position (last position before start)

3. Hold in this state for 30 seconds

Hope this may be of use !!

Mar 28, 2009 | 2004 Isuzu Rodeo

1 Answer

Heat will not blow down by my feet


Hi: On the back of the heater control unit are vacuum lines, make sure plug is firmly attached. FIRST though check if vehicle does not go into 4WD high. If not then you probably have a vacuum problem under the hood as vacuum controls heater, 4WD and other functions. Check to make sure vacuum lines under the hood are all attached starting with the vacuum pod (located in front L fender by brake module.) and chasing them under the hood. If you have vacuum then check heater control module and lastly heater door vacuum actuators. Hope this helps.

Feb 03, 2009 | 1998 Chevrolet Blazer

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