I recently bought this 95 suburban 2500 7.4L and Ive done everything possible to try and get it running cooler such as flushing and backflushing all the cooling system inlet/outlet tubes, installing a lower temp 180 degree thermostat (and testing it before installation), making sure none of the coolant hoses are kinked, properly bleeding air out of the system, testing the temp sending sensor for accuracy.....but still on a hot day driving uphill just for 2 miles the temp will reach 230ish even while blasting the heater. The only thing left I can think of is a bad coolant temperature sensor or remove the dual electric fan conversion installed by the previous owner and get a heavy duty clutch fan. What do you guys think?
Greetings whataTRUUUCK,
Welcome to the GMT400 forum! There's a wealth of talent in here -- enough so that it takes
awhile to sort out exactly what everyone's specialty is.
Good news -- we have a few Subject Matter Experts in here who have not only hot-rodded their
cooling systems but have shared all the details on what exact combo of parts can keep a big block
cool while they are towing, and also enjoying the A/C in TX or the desert southwest.
In particular, when it comes to cooling systems all you need to do is replicate whatever L31MaxExpress
is doing. Here's a typical response from him in a detailed thread discussing cooling a GMT400:
(
Texas duty mechanical fans & clutches)
Seriously, if you search the site for cooling system upgrades by L31MaxExpress, you will find
some solid discussions where they seemed to pick up where the GM AZ proving grounds left off.
I used to worry about upgrading my big block to the point where it would be tough to keep cool, but
these guys are all over that. No more worries.
Hope this helps. Search around a bit, and then if you come back with a specific question about
a possible best-reasonable-effort combo no doubt they will be able to point you in the right
direction.
PS - As mentioned by others,
aftermarket electric fans on your rig is like expecting a 5,000 BTU
window air conditioner to keep up with a 3600 sq. ft. house in Dallas in August. No bueno.