GRAND OVERHEATING

1999 Dodge Caravan

Tiny

kohllink

March, 25, 2012 AT 2:31 AM

After the van warms up(about 2 miles) the temp gauge starts to get close to pegging the hot line. Replaced the thermostat and water pump. Still acting the same. I haven't seen any milky oil yet. Not blowing any white exhaust yet. I see some bubbles when the radiator cap is off when I'm checking the antifreeze. I guess my question is does head gasket sealers work?

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7 Answers

Tiny

johnsgarage99

March, 25, 2012 AT 3:40 AM

O.K. First a few simple ideas. Have you cleaned the radiator out? Take the upper and lower hoses off and flush water thru the radiator. Then take a hose and flush thru the radiator to clear out bugs and road debris. You are using a 50/50 mix of good antifreeze? See if your local auto parts store has a cooling system pressure tester. Put that on where your radiator cap goes, start the van and watch the gauge as the van warms up.
If it climbs over 17 lbs you may have a head gasket issue.

Tiny

fixitmr

March, 25, 2012 AT 4:02 AM

If pressure test fails head gasket sealer may fix it. Cheaper than engine dis-assembly.

Tiny

kohllink

March, 30, 2012 AT 12:56 AM

Regrouped could this be a bad cooling fan relay? The fans work when in park or at a low rpm. Could fan speed be a problem at higher speeds with the a/c on?

Tiny

fixitmr

March, 30, 2012 AT 3:56 PM

Fans need to be on high speed with air on.

Tiny

kohllink

March, 30, 2012 AT 7:24 PM

Just took the van for a ride till it got hot. The radiator cap was not hot and the top hose was rock hard like the thermostat was closed. Could it be a bad thermostat? I replaced the thermostat. Might of gotten a defective one.

Tiny

fixitmr

March, 30, 2012 AT 9:37 PM

Just remove it/drive it and see how it goes.

Tiny

kohllink

March, 31, 2012 AT 4:39 PM

Removed the thermostat and drove for 30 minutes with the air on and the highest temp reading on the gauge was about 3/4 up. It usually runs at about the halfway mark.

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