Canadian Hummer Club Forums

So tomorrow I start on my Cooling system conversion!

It all started since I found my water pump leaking and then I thought well I better replace my coolant and my fan clutch at the same time!

So I have ordered everything and the remaining parts arrive this week...but it doesn't stop me from starting the project tomorrow.


Things I am doing and parts I will be using;

1. Replacing the Water Pump with a Brand New AC Delco unit.

2. Replacing my current AMSOIL engine coolant for Evans Waterless Coolant

3. Replacing my Vicous Fan Clutch and Fan with a Dorman 620-654 Electric Cooling Fan Assembly. I am getting the triple relay wiring harness complete with switch from PMC in North Carolina.

4. Use my tuning software to activate and tune the electric fan operation via the ECM

5. Installing a High Output AC Delco 253Amps alternator to replace the OEM 145Amp unit just to make sure I will not have any issues when offroad.

So Yes, I will be posting pics and détails as I go!

I am hoping to get a nice boost to cooling efficency and fuel economy!

Stay Tuned,

Kev

Kev, any reason why you went with Dorman instead of OEM for 08-09 H2 model electric fan assembly?

Cfm I'd guess?

Kev, any reason why you went with Dorman instead of OEM for 08-09 H2 model electric fan assembly?

Price was one and the Dorman unit is capable of pushing a tad more air especially when using the PMC triple relay kit.

With the switch I will have ECM control, both fans on low and then both fans on high/max.

Subscribed.

So last night I started by taking inventory to make sure all the parts I ordered had arrived and that I was pleased with the quality as well.

Here are some pics;

The Dorman 620-654 Dual Electric Fan Assembly, I must say I am very pleased with it's heavy duty construction!
The Triple Relay Wiring Harness from PMC of NC, Very Impressed with the quality of workmanship! Like an OEM harness! Love It!
New AC Delco Water Pump
And my new 253Amp Alternator!
And yes then there are my new rad hoses and thermostat and Evans Waterless Coolant!


The tear down begins tonight!

Stay Tuned,

Kev

I love new parts!!

Changing them (smaller jobs) are my relaxing time

So tonight the work began!
 
So here are the before I touched anything pics;

First I release the large cooling fan nut and remove the shroud with the original fan. It came out really easy btw!


Once I had the fan and shroud out of the way...I noticed that I had lots of silt blocking the cooling fins of the radiator where the shroud would not allow flow through for the incomming air! Oh well, once I clean that all will be good!


Here is the stock fan and shroud versus the new Electric Cooling Fan. Definitely a major difference in airflow and effciency!

Next, off comes the water pump and obviously all the coolant;

You can see where the pump was leaking on the upper driver's side.

So I have also installed the new 253Amp Alternator but I need to upgrade the wire to a 4 gauge before I secure everything.

I have also blown out most of the lines for the cooling system and tomorrow night I will continue with the full cooling system flush before I install the new Evans Waterless coolant. I calibrated the refractometer this evening.

I also realized I need a new thermostat...for some reason I though it came with the pump...oh well!

I also noticed that my idler pulley is just starting to make some weird noises so I will be changing that as well since I have everything off!

The new E-Fan Shroud will require some minor mounting hole modifications but nothing to complicated!

Stay Tuned,

Kev