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Replaced motor on h1 hummer 6.5 diesel,we are not able to get the ac working.jumping compressor activates the system.does not use wiring from gm truck.need a print for hummer hvac

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Check all of your fuses and give this website a try fix trouble shoot heating & A/C www.automedia.com and another one is www.directgardening and i hope i have been some help to you Michigan Man.

Posted on May 22, 2009

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The motor has two wires. just jump 12 volts to them.

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I have a h1 hummer that will not start i have changed the glow plugs and the controler also the box on the injecter pump. I am geting fuel and the glow plugs are working. The hummer has set for a year....


Diesel fuel doesn't go bad like gasoline, at least not as fast. I've been around diesels in construction equipment and sometime a machine will sit for a couple years and still start right up. You have other problems. I don't know that much about the Hummer diesels but, Ford uses a high pressure oil pump to fire the injectors. The main oil pump supplies oil to the high pressure oil pump reservoir and then the high pressure pump supplies oil to the injectors. If Hummer uses a similar system the reservoir may have drained down and there is no oil for the high pressure pump to pump. Ford has plug where a person can fill that reservoir manualy if necessary. Maybe try cranking it some more, don't crank it more than 10-15 seconds at a time. Walk away from it for 10 minutes or so, then try again, make sure you let the glow plugs cycle. If it don't start after a half dozen tries, you may have to have a mechanic look at it. I'm sorry I can't be more help.

Feb 11, 2010 | 2002 Hummer H1

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Blower motor is making noise, how do I access it


with you asking it just reminded me of how long it had been since i was at the dealership. so here i am with my manual and if you take off the kick panel on the passenger side you will see the blower motor assembly. the auxilary one is in the centre console just before the back seating area. these things are real easy. just keep track of the screws lol. if its making noise it will need to be replaced but pull it first to make sure there are no leaves in the housing. be sure to double check the numbers for the gm number. these are ACME units and if i remember right you can get a gm aftermarket replacement cheaper then HUMMER.

Dec 30, 2009 | 2003 Hummer H1

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2001 h1 diesel stalls then wont start unless i wait for a while. it cranks but does not start. after a half hour or so it will start.


air getting in fuel supply system.or the injection pump is defective.idle speed could be too low.

Nov 26, 2009 | 2004 Hummer H1

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Hi want to install a aftermarket stereo in a 99 hummer h1 with a monsoon factory radio in it anybody have a wiring diag?


it is very common to do so however as a h1 tech myself i do not recomend such. it was by design that these monsoon systems drown out some of the decibles created by the diesel engine. if you still decide to do so i can get my manual out of storage and tell you which one are which. email me at iambanshee74@yahoo.com

Oct 26, 2009 | 2004 Hummer H1

3 Answers

A/C Compressor not kicking on


The power to run the compressor clutch coil goes from the battery, to the AC Clutch Relay, somewere in the engine compartment fuse box, then it goes to the positive side of the AC compressor clutch coil; goes thru the coil, activating the compressor, and then goes to complete the circuit through another switch (high pressure protection switch) in the back of the AC compressor and finally reaching negative or Ground.

Disconnect the AC compressor clutch connector and using a 12 V bulb with 2 wires (test lamp) check the following:

1.- connect 1 lamp wire to battery neg; with the other check both pins at connector with the AC in the RUN (AC and ignition switch on ) you should have power in one side.

2.- connect 1 lamp wire to battery positive and with the other check both pins at connector, lamp should light getting the ground from the clutch connector thru the high pressure compressor switch to ground.

On the other side what makes the relay close and let the power flow to the clutch works with the low pressure switch, (if the freon pressure is too low it opens and kills the ground to the relay coil and that kills the compressor), that low pressure switch is in the low pressure side of the freon tubing, the fat pipe that comes from inside the firewall into the accumulator/dryer, a big aluminum cylinder sitting on the right side of the engine compartment in GM cars.

To know if the low press switch is the cause you can unplug it and connect both legs with a paper clip for a minute or two, no more, you don't want to damage the compressor. anyway if jumping the switch makes the compressor come alive and kick in, you either have low freon pressure or a bad switch; it's time for the pressure gauges and check how the compressor is pumping and that is better left to a pro.

By the way you said that your system is a R-12 system, have you considered switching to R-134a the new "ozone friendly" freon? to do that you need to evacuate the system with a recycling machine and pull vacuum in your AC, if it holds the vacuum for a while, then you can be sure that there are not leaks and then dump 1.5 or 2 pound (check the labels in the engine compartment) of R-134a into your system. it will be a good idea to put some fluorescent leak detecting dye in the system to check for leaks, just in case..

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Replacing rear brakes on a hummer h1 2000


ase labor chart shows 3.6 hours normal time for these repairs. avg actual time is 3.5 to 4 hrs and this includes pressure bleeding system.

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Cant figure out which plug leads go where on the coil pack


the hummer h1 have an diesel engine , i think about you never find the spark plugs

Mar 23, 2009 | 2005 Hummer H1

1 Answer

Charging system problem.


go to www.humvee.net or www.flashoffroad.com Both have an extensive data base of tech info

Feb 10, 2009 | 2002 Hummer H1

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