Last post on May 03, 2013 at 7:11 AM
You are in the Chevrolet Silverado & GMC Sierra
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GMC Sierra 1500, Truck
#78 of 79 I have an Interesting Situation
May 03, 2013 (6:30 am)
I have a 94 K-1500 Suburban 350ci, that we just purchased, it had a crack in the tank of the radiator. So I replaced the radiator, water pump, and thermostat. The original radiator was a single core, was replaced with a 2 core, that's the only one AutoZone had in a 34'' core (between the tanks). Problem 1:The thermostat I had bought didn't fit in the seat in the intake manifold (it was smaller and moved around a lot, in fact you could slide it to one side and there would be a gap that would allow water to pass), I took it back thinking that they gave me the wrong one, I was assured it was the correct one. Has anyone ever run into this situation with a thermostat? As I have never in my 20+ years working on cars.Problem 2: The engine doesn't want to get up to temperature, 180 degree thermostat. My guess it that the thermostat had moved allowing a gap to allow water to pass. The gap guessing would be maybe a 1/4'' or less, that just doesn't seem like a big enough passage to keep it that cool, it barely get off of the 100 degree mark. The fact that the radiator is a 2 core instead of a 1 core entered my mind, but the thermostat basically keeps the water in the engine until it reaches the proper temp that would allow it to open exchanging hot water and for cool water. And my experiences with over sized radiators not matching water pump volume usually causes an over heating problem. Your Thoughts
#79 of 79 Re: Fogged Windows, No Leak In Cab, Evap Core Drain Leaking [sierratruck]
May 03, 2013 (7:11 am)
If your are constantly having to add coolant, then its the heater core. Newer style climate boxes houses both the evap and heat cores with using an exchange door that opens and closes to allow heat or to block the heat to the cab area. So the both being housed in the same box this would allow for any heater core coolant leak to exit in the same drain as the condensation. One easy way to test for coolant leak at the climate box, is to run the engine with A/C off, heat on. If you see liquid coming from the drain at the firewall it is coolant.