temp gauge goes hot then cools and cabin heat does the same. changed thermostat, water pump, ect sensor and it still happens. what else could it be? 2001 chevy venture.

10

Asked by Oct 19, 2012 at 12:49 PM about the 2001 Chevrolet Venture LS Extended

Question type: Maintenance & Repair

6 Answers

35,255

How hot and how cool?

8 of 8 people found this helpful.
10

sometime in the red. and heater blow outside air temp.

1 of 1 people found this helpful.
35,255

Could be a bad temp sensor could be an air pocket in the system or a clog somewhere. Those are the most common for that situation. If its like my buddies 01 sierra there is a little orifice in the hose going to the heater core to prevent chunks of contaminate getting into the heater core. The orifice was clogged after flushing the heater core in reverse it worked fine.

2 of 2 people found this helpful.
19,535

Not to scare you, but I've seen if on your series of engine. If something with a water jacket is leaking and introducing air to the system it tends to do this. Try burping the system. If it happens still after that sensors are worth checking but you may have something like bad intake gasket or head gasket. Not trying to jump the gun, still try simple stuff first.

1 of 1 people found this helpful.
35,255

98-03ish only reason I didn't mention the dexcool intake gasket issue is because he didn't mention coolant loss or milky oil.

410

flush the heater core

3 of 3 people found this helpful.

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