Skip the auto shop - Our mechanics make house calls

Q: Why is my truck overheating from start up?

asked by on

Ok so the full story, I took my heads off and had them rebuilt, bought knew push rods, lifters and put everything back together, also put a new distributor in as well as spark plugs and wires. I started it up, the motor sount good, smoke was coming from the engine but I assume it's from the new grease and oil on the heads from the rebuild. I noticed the temp. gage was climbing fast from a cold start. It reached 210 in about 5 minutes, it kept climbing but I turned it off to ovoid any other damage to the engine. I have no clue what this could be, one mechanic I talked to said it could be out of time just a notch. I really would appreciate any help. My truck has been down for 3 months

My car has 149000 miles.
My car has a manual transmission.

Hi, I will be glad to help you. On refilling the cooling system you could have trapped air or air pockets. Such will prevent coolant circulation and the engine WILL overheat. There are typically air purge points in the system that you leave open while refilling. Sometimes you still get air pockets.

Last time that happened to me, I took a couple sharp turns to burp the car (dislodge the pocket of air) and once that happened the gauge plummeted (I’m not kidding, trapped air will cause overheating until the pocket is dislodged).

If heads and block were not flat at assembly, within .002 in. or so, you could have head gasket (exhaust) leak into the coolant. And, yes, timing could be off. Check ignition timing first.

If you need further assistance, by all means a mobile YourMechanic technician could be dispatched to diagnose your overheating issue and help you repair it as necessary.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: car wont start after changing crank shaft pulley

This sounds like potentially either a loose crankshaft pulley bolt or potentially stripped threads on this bolt. Either way, this has likely caused a problem with timing and potentially a variety of other issues. Since you can't get the car...

Q: My Chevy is excessively cranking.

Fuel pump is a possibility but a coolant temperature sensor is also a possibility. The fuel system pressure should be checked/compared to Chevy specs. You should see 40-45 psi in the line even after sitting for minutes or hours. Any...

Q: Good evening, i have a 2002 ford explorer 4.0L V6 that is over heating.

Overheating can be caused by a number of things such as low coolant levels, a faulty thermostat, a clogged radiator or a failing coolant fan switch. As you may know the coolant fan switch helps to maintain the proper coolant...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...